<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
	<id>https://boincsynergy.ca/wiki/index.php?action=history&amp;feed=atom&amp;title=EOn</id>
	<title>EOn - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://boincsynergy.ca/wiki/index.php?action=history&amp;feed=atom&amp;title=EOn"/>
	<link rel="alternate" type="text/html" href="https://boincsynergy.ca/wiki/index.php?title=EOn&amp;action=history"/>
	<updated>2026-07-27T04:44:28Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.43.8</generator>
	<entry>
		<id>https://boincsynergy.ca/wiki/index.php?title=EOn&amp;diff=1778&amp;oldid=prev</id>
		<title>Al Piskun at 10:22, 25 July 2026</title>
		<link rel="alternate" type="text/html" href="https://boincsynergy.ca/wiki/index.php?title=EOn&amp;diff=1778&amp;oldid=prev"/>
		<updated>2026-07-25T10:22:59Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 10:22, 25 July 2026&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l31&quot;&gt;Line 31:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 31:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| gpu performance      =  &lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| gpu performance      =  &lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| cpu performance      =  &lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| cpu performance      =  &lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| website              = {{URL|&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;https://web.archive.org/&lt;/del&gt;http://eon.ices.utexas.edu/eon2/}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| website              = {{URL|http://eon.ices.utexas.edu/eon2/}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| license              = GPL-3.0&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| license              = GPL-3.0&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l37&quot;&gt;Line 37:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 37:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{Lowercase title}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{Lowercase title}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&#039;&#039;&#039;eOn&#039;&#039;&#039; (styled &#039;&#039;&#039;eOn2&#039;&#039;&#039; during its time on the [[wikipedia:Berkeley Open Infrastructure for Network Computing|BOINC]] platform) was a completed [[wikipedia:volunteer computing|volunteer computing]] project of the Henkelman Research Group at the [[wikipedia:University of Texas at Austin|University of Texas at Austin]], run out of the university&#039;s [[wikipedia:Institute for Computational Engineering and Sciences|Institute for Computational Engineering and Sciences]] (ICES).&amp;lt;ref name=&quot;wiki-eon&quot;&amp;gt;Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &#039;&#039;Modelling and Simulation in Materials Science and Engineering&#039;&#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&amp;lt;/ref&amp;gt; The project applied [[wikipedia:theoretical chemistry|theoretical chemistry]] methods, chiefly [[wikipedia:transition state theory|transition state theory]] combined with [[wikipedia:kinetic Monte Carlo|kinetic Monte Carlo]], to model the evolution of atomic scale systems over timescales far longer than those reachable with conventional [[wikipedia:molecular dynamics|molecular dynamics]]. Its name is drawn from &#039;&#039;[[wikipedia:aeon|eon]]&#039;&#039;, a reference to the immeasurably long timescales the software was built to reach.&amp;lt;ref name=&quot;bcteam&quot;&amp;gt;[https://www.bc-team.org/viewtopic.php?t=595 eOn]. BOINC Confederation forum. Posted 1 September 2010.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&#039;&#039;&#039;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[https://web.archive.org/http://eon.ices.utexas.edu/eon2/ &lt;/ins&gt;eOn&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]&lt;/ins&gt;&#039;&#039;&#039; (styled &#039;&#039;&#039;eOn2&#039;&#039;&#039; during its time on the [[wikipedia:Berkeley Open Infrastructure for Network Computing|BOINC]] platform) was a completed [[wikipedia:volunteer computing|volunteer computing]] project of the Henkelman Research Group at the [[wikipedia:University of Texas at Austin|University of Texas at Austin]], run out of the university&#039;s [[wikipedia:Institute for Computational Engineering and Sciences|Institute for Computational Engineering and Sciences]] (ICES).&amp;lt;ref name=&quot;wiki-eon&quot;&amp;gt;Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &#039;&#039;Modelling and Simulation in Materials Science and Engineering&#039;&#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&amp;lt;/ref&amp;gt; The project applied [[wikipedia:theoretical chemistry|theoretical chemistry]] methods, chiefly [[wikipedia:transition state theory|transition state theory]] combined with [[wikipedia:kinetic Monte Carlo|kinetic Monte Carlo]], to model the evolution of atomic scale systems over timescales far longer than those reachable with conventional [[wikipedia:molecular dynamics|molecular dynamics]]. Its name is drawn from &#039;&#039;[[wikipedia:aeon|eon]]&#039;&#039;, a reference to the immeasurably long timescales the software was built to reach.&amp;lt;ref name=&quot;bcteam&quot;&amp;gt;[https://www.bc-team.org/viewtopic.php?t=595 eOn]. BOINC Confederation forum. Posted 1 September 2010.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;eOn joined the BOINC network in September 2010 and ran until it was retired in May 2014. The underlying EON research code, distinct from the retired volunteer computing project, continues to be developed and used within the [[wikipedia:computational chemistry|computational chemistry]] community.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;eOn joined the BOINC network in September 2010 and ran until it was retired in May 2014. The underlying EON research code, distinct from the retired volunteer computing project, continues to be developed and used within the [[wikipedia:computational chemistry|computational chemistry]] community.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l51&quot;&gt;Line 51:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 51:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Early participants reported a bumpy rollout, including client crashes on Mac OS X and complaints about long-running, unchecked work units, alongside genuine enthusiasm from teams that had followed the Henkelman group&amp;#039;s earlier, non-BOINC eOn effort.&amp;lt;ref name=&amp;quot;boinc-launch&amp;quot; /&amp;gt;&amp;lt;ref name=&amp;quot;eonclient400&amp;quot;&amp;gt;eOn Client 4.00. UT theoretical chemistry code forum. Posted February 2012.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Early participants reported a bumpy rollout, including client crashes on Mac OS X and complaints about long-running, unchecked work units, alongside genuine enthusiasm from teams that had followed the Henkelman group&amp;#039;s earlier, non-BOINC eOn effort.&amp;lt;ref name=&amp;quot;boinc-launch&amp;quot; /&amp;gt;&amp;lt;ref name=&amp;quot;eonclient400&amp;quot;&amp;gt;eOn Client 4.00. UT theoretical chemistry code forum. Posted February 2012.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File:UT Tower, University of Texas in Austin.jpg|thumb|The University of Texas at Austin, home to the Institute for Computational Engineering and Sciences, where eOn was developed and hosted.]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File:UT Tower, University of Texas in Austin.jpg|thumb|The University of Texas at Austin, home to the Institute for Computational Engineering and Sciences, where eOn was developed and hosted.&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;|658x658px&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Scientific method ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Scientific method ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l67&quot;&gt;Line 67:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 67:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The dimer is rotated to align with this minimum mode and then walked uphill along it until it converges on a saddle point.&amp;lt;ref name=&amp;quot;dimer1999&amp;quot; /&amp;gt; Besides aKMC, the EON software also implemented [[wikipedia:parallel replica dynamics|parallel replica dynamics]], [[wikipedia:hyperdynamics|hyperdynamics]], and global optimization methods including [[wikipedia:simulated annealing|simulated annealing]], [[wikipedia:basin hopping|basin hopping]], and minima hopping.&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The dimer is rotated to align with this minimum mode and then walked uphill along it until it converges on a saddle point.&amp;lt;ref name=&amp;quot;dimer1999&amp;quot; /&amp;gt; Besides aKMC, the EON software also implemented [[wikipedia:parallel replica dynamics|parallel replica dynamics]], [[wikipedia:hyperdynamics|hyperdynamics]], and global optimization methods including [[wikipedia:simulated annealing|simulated annealing]], [[wikipedia:basin hopping|basin hopping]], and minima hopping.&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[File:Potential Energy Surface and Corresponding Reaction Coordinate Diagram.png|thumb|A potential energy surface with a saddle point separating two minima, the kind of feature EON&#039;s dimer method searches for.]]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Software architecture ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Software architecture ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;EON used a client/server design: computationally intensive force and energy evaluations ran on volunteer client machines, while a central server managed the overall state-to-state evolution of the simulation, for example driving the kinetic Monte Carlo bookkeeping in aKMC runs. The server was written in [[wikipedia:Python (programming language)|Python]] and the client in [[wikipedia:C++|C++]], the latter chosen so that a self-contained compiled executable could be distributed easily to volunteers.&amp;lt;ref name=&quot;wiki-eon&quot; /&amp;gt; Beyond BOINC, the same codebase could also run on a single workstation, on cluster queuing systems, and on large parallel machines via [[wikipedia:Message Passing Interface|MPI]].&amp;lt;ref name=&quot;ltd-docs&quot; /&amp;gt; The code was released under version 3 of the [[wikipedia:GNU General Public License|GNU General Public License]].&amp;lt;ref name=&quot;wiki-eon&quot; /&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[File:Potential Energy Surface and Corresponding Reaction Coordinate Diagram.png|thumb|A potential energy surface with a saddle point separating two minima, the kind of feature EON&#039;s dimer method searches for.|left|344x344px]]&lt;/ins&gt;EON used a client/server design: computationally intensive force and energy evaluations ran on volunteer client machines, while a central server managed the overall state-to-state evolution of the simulation, for example driving the kinetic Monte Carlo bookkeeping in aKMC runs. The server was written in [[wikipedia:Python (programming language)|Python]] and the client in [[wikipedia:C++|C++]], the latter chosen so that a self-contained compiled executable could be distributed easily to volunteers.&amp;lt;ref name=&quot;wiki-eon&quot; /&amp;gt; Beyond BOINC, the same codebase could also run on a single workstation, on cluster queuing systems, and on large parallel machines via [[wikipedia:Message Passing Interface|MPI]].&amp;lt;ref name=&quot;ltd-docs&quot; /&amp;gt; The code was released under version 3 of the [[wikipedia:GNU General Public License|GNU General Public License]].&amp;lt;ref name=&quot;wiki-eon&quot; /&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Discontinuation ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Discontinuation ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l80&quot;&gt;Line 80:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 78:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Publications ==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;== Publications ==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The Berkeley BOINC project maintains a list of [https://boinc.berkeley.edu/pubs.php#EOn publications with results arising from BOINC-based computing], including work that made use of the eOn volunteer computing project:&amp;lt;ref name=&quot;pubs-boinc&quot;&amp;gt;Publications by BOINC Projects. boinc.berkeley.edu/pubs.php. Maintained by Alex Piskun.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[File:TiltAndTwistBoundaries remade.JPG|thumb|Illustration of tilt and twist grain boundaries, the kind of defect studied in the 2009 EON simulation of a copper grain boundary.|439x439px]]&lt;/ins&gt;The Berkeley BOINC project maintains a list of [https://boinc.berkeley.edu/pubs.php#EOn publications with results arising from BOINC-based computing], including work that made use of the eOn volunteer computing project:&amp;lt;ref name=&quot;pubs-boinc&quot;&amp;gt;Publications by BOINC Projects. boinc.berkeley.edu/pubs.php. Maintained by Alex Piskun.&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &amp;#039;&amp;#039;Modelling and Simulation in Materials Science and Engineering&amp;#039;&amp;#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &amp;#039;&amp;#039;Modelling and Simulation in Materials Science and Engineering&amp;#039;&amp;#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l88&quot;&gt;Line 88:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 86:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Xu, Lijun, Graeme Henkelman. [http://aip.scitation.org/doi/10.1063/1.2976010 Adaptive kinetic Monte Carlo for first-principles accelerated dynamics]. &amp;#039;&amp;#039;The Journal of Chemical Physics&amp;#039;&amp;#039; (2008). {{DOI|10.1063/1.2976010}}.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Xu, Lijun, Graeme Henkelman. [http://aip.scitation.org/doi/10.1063/1.2976010 Adaptive kinetic Monte Carlo for first-principles accelerated dynamics]. &amp;#039;&amp;#039;The Journal of Chemical Physics&amp;#039;&amp;#039; (2008). {{DOI|10.1063/1.2976010}}.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Henkelman, Graeme, Hannes Jónsson. [https://link.aps.org/doi/10.1103/PhysRevLett.90.116101 Multiple Time Scale Simulations of Metal Crystal Growth Reveal the Importance of Multiatom Surface Processes]. &amp;#039;&amp;#039;Physical Review Letters&amp;#039;&amp;#039; (2003). {{DOI|10.1103/PhysRevLett.90.116101}}.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;# Henkelman, Graeme, Hannes Jónsson. [https://link.aps.org/doi/10.1103/PhysRevLett.90.116101 Multiple Time Scale Simulations of Metal Crystal Growth Reveal the Importance of Multiatom Surface Processes]. &amp;#039;&amp;#039;Physical Review Letters&amp;#039;&amp;#039; (2003). {{DOI|10.1103/PhysRevLett.90.116101}}.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[File:TiltAndTwistBoundaries remade.JPG|thumb|Illustration of tilt and twist grain boundaries, the kind of defect studied in the 2009 EON simulation of a copper grain boundary.]]&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;No additional eOn-specific publications beyond these six were found in the BOINC publications registry at the time of writing.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;No additional eOn-specific publications beyond these six were found in the BOINC publications registry at the time of writing.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;

&lt;!-- diff cache key boin_wiki-mwdr_:diff:1.41:old-1777:rev-1778:php=table --&gt;
&lt;/table&gt;</summary>
		<author><name>Al Piskun</name></author>
	</entry>
	<entry>
		<id>https://boincsynergy.ca/wiki/index.php?title=EOn&amp;diff=1777&amp;oldid=prev</id>
		<title>Al Piskun: first light</title>
		<link rel="alternate" type="text/html" href="https://boincsynergy.ca/wiki/index.php?title=EOn&amp;diff=1777&amp;oldid=prev"/>
		<updated>2026-07-25T10:17:01Z</updated>

		<summary type="html">&lt;p&gt;first light&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{Infobox software&lt;br /&gt;
| name                 = eOn&lt;br /&gt;
| logo                 = &lt;br /&gt;
| logo caption         = &lt;br /&gt;
| screenshot            = &lt;br /&gt;
| caption              = &lt;br /&gt;
| description          = eOn (also known as eOn2 on BOINC) was a completed volunteer computing project run by the Henkelman Research Group at the University of Texas at Austin. It used adaptive kinetic Monte Carlo and dimer method saddle point searches to simulate the long timescale evolution of atomic scale systems in chemistry and materials science.&lt;br /&gt;
| status               = Completed&lt;br /&gt;
| category             = Materials Science&lt;br /&gt;
| compute              = CPU&lt;br /&gt;
| dependencies         = None&lt;br /&gt;
| developer            = Henkelman Research Group, University of Texas at Austin, in collaboration with the Jónsson Research Group, University of Iceland&lt;br /&gt;
| author               = Graeme Henkelman and Hannes Jónsson&lt;br /&gt;
| sponsor              = Institute for Computational Engineering and Sciences (ICES), University of Texas at Austin&lt;br /&gt;
| maintainer           = Discontinued as a BOINC project; the underlying EON software is maintained independently (see [[#Legacy|Legacy]])&lt;br /&gt;
| released             = {{Start date and age|2010|09|07}}&lt;br /&gt;
| completed            = Yes&lt;br /&gt;
| discontinued         = {{Start date and age|2014|05|26}}&lt;br /&gt;
| repository           = {{URL|https://github.com/TheochemUI/eOn}}&lt;br /&gt;
| programming language = C++ (client), Python (server)&lt;br /&gt;
| operating system     = Windows, Linux, macOS&lt;br /&gt;
| size                 = Not documented&lt;br /&gt;
| stats as of          = &lt;br /&gt;
| average performance  = &lt;br /&gt;
| active users         = &lt;br /&gt;
| total users          = &lt;br /&gt;
| active hosts         = &lt;br /&gt;
| total hosts          = &lt;br /&gt;
| rac                  = &lt;br /&gt;
| credit per day       = &lt;br /&gt;
| gpu performance      = &lt;br /&gt;
| cpu performance      = &lt;br /&gt;
| website              = {{URL|https://web.archive.org/http://eon.ices.utexas.edu/eon2/}}&lt;br /&gt;
| license              = GPL-3.0&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
{{Lowercase title}}&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;eOn&amp;#039;&amp;#039;&amp;#039; (styled &amp;#039;&amp;#039;&amp;#039;eOn2&amp;#039;&amp;#039;&amp;#039; during its time on the [[wikipedia:Berkeley Open Infrastructure for Network Computing|BOINC]] platform) was a completed [[wikipedia:volunteer computing|volunteer computing]] project of the Henkelman Research Group at the [[wikipedia:University of Texas at Austin|University of Texas at Austin]], run out of the university&amp;#039;s [[wikipedia:Institute for Computational Engineering and Sciences|Institute for Computational Engineering and Sciences]] (ICES).&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot;&amp;gt;Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &amp;#039;&amp;#039;Modelling and Simulation in Materials Science and Engineering&amp;#039;&amp;#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&amp;lt;/ref&amp;gt; The project applied [[wikipedia:theoretical chemistry|theoretical chemistry]] methods, chiefly [[wikipedia:transition state theory|transition state theory]] combined with [[wikipedia:kinetic Monte Carlo|kinetic Monte Carlo]], to model the evolution of atomic scale systems over timescales far longer than those reachable with conventional [[wikipedia:molecular dynamics|molecular dynamics]]. Its name is drawn from &amp;#039;&amp;#039;[[wikipedia:aeon|eon]]&amp;#039;&amp;#039;, a reference to the immeasurably long timescales the software was built to reach.&amp;lt;ref name=&amp;quot;bcteam&amp;quot;&amp;gt;[https://www.bc-team.org/viewtopic.php?t=595 eOn]. BOINC Confederation forum. Posted 1 September 2010.&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
eOn joined the BOINC network in September 2010 and ran until it was retired in May 2014. The underlying EON research code, distinct from the retired volunteer computing project, continues to be developed and used within the [[wikipedia:computational chemistry|computational chemistry]] community.&lt;br /&gt;
&lt;br /&gt;
== History ==&lt;br /&gt;
&lt;br /&gt;
=== Origins ===&lt;br /&gt;
The EON software grew out of long-running work in the Henkelman group (University of Texas at Austin) and the Jónsson group (then at the University of Iceland) on methods for simulating rare-event dynamics in solids, building on the [[wikipedia:dimer method|dimer method]] the two researchers had developed for locating [[wikipedia:saddle point|saddle points]] on potential energy surfaces without needing a known final state.&amp;lt;ref name=&amp;quot;dimer1999&amp;quot;&amp;gt;Henkelman, Graeme, Hannes Jónsson. [https://henkelmanlab.org/pubs/henkelman99_7010.pdf A dimer method for finding saddle points on high dimensional potential surfaces using only first derivatives]. &amp;#039;&amp;#039;The Journal of Chemical Physics&amp;#039;&amp;#039; 111(15), 7010 (1999). {{DOI|10.1063/1.480097}}.&amp;lt;/ref&amp;gt; Before it was ported to BOINC, the group ran an earlier, home-built distributed computing system under the name eOn; forum members reported that the &amp;quot;old eOn client application&amp;quot; was subsequently rebuilt on BOINC&amp;#039;s client/server architecture as eOn2, with the intention of later adding dynamics trajectories and &amp;#039;&amp;#039;[[wikipedia:ab initio quantum chemistry methods|ab initio]]&amp;#039;&amp;#039; ([[wikipedia:density functional theory|density functional theory]]) work units.&amp;lt;ref name=&amp;quot;welcome-eon2&amp;quot;&amp;gt;Welcome to the world, eOn2. UT theoretical chemistry code forum. Posted September 2010.&amp;lt;/ref&amp;gt; For a time two separate project addresses existed, one on the group&amp;#039;s older &amp;#039;&amp;#039;cm.utexas.edu&amp;#039;&amp;#039; domain and one on &amp;#039;&amp;#039;ices.utexas.edu&amp;#039;&amp;#039;; volunteers were directed to the ICES address as the project&amp;#039;s active server.&amp;lt;ref name=&amp;quot;two-eon-sites&amp;quot;&amp;gt;Two eon web sites. UT theoretical chemistry code forum. Posted 22 November 2011.&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
=== Launch on BOINC ===&lt;br /&gt;
eOn was announced as a new BOINC project on 7 September 2010 by [[wikipedia:David P. Anderson|David P. Anderson]], describing it as a study of &amp;quot;the dynamic simulation of physical and chemical processes over a time scale which is much longer than can be reached with traditional molecular dynamics.&amp;quot;&amp;lt;ref name=&amp;quot;boinc-launch&amp;quot;&amp;gt;Anderson, David P. New project: eOn. BOINC News forum, message 34564. Posted 7 September 2010.&amp;lt;/ref&amp;gt; Because the generation of new work units depended on the results already returned by earlier ones, eOn could typically only keep a handful of tasks in flight on any one host at a time, a workflow characteristic of its [[#Scientific method|adaptive kinetic Monte Carlo]] approach.&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Early participants reported a bumpy rollout, including client crashes on Mac OS X and complaints about long-running, unchecked work units, alongside genuine enthusiasm from teams that had followed the Henkelman group&amp;#039;s earlier, non-BOINC eOn effort.&amp;lt;ref name=&amp;quot;boinc-launch&amp;quot; /&amp;gt;&amp;lt;ref name=&amp;quot;eonclient400&amp;quot;&amp;gt;eOn Client 4.00. UT theoretical chemistry code forum. Posted February 2012.&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[File:UT Tower, University of Texas in Austin.jpg|thumb|The University of Texas at Austin, home to the Institute for Computational Engineering and Sciences, where eOn was developed and hosted.]]&lt;br /&gt;
&lt;br /&gt;
== Scientific method ==&lt;br /&gt;
eOn&amp;#039;s simulations targeted &amp;#039;&amp;#039;rare event&amp;#039;&amp;#039; systems, ones in which the interesting physics, such as [[wikipedia:diffusion|diffusion]] in solids or [[wikipedia:chemical reaction|chemical reactions]] at surfaces, consists of infrequent transitions between long-lived stable states, separated by fast atomic vibrations that are many orders of magnitude quicker than the transitions themselves. A direct [[wikipedia:molecular dynamics|molecular dynamics]] simulation tracking every vibration would need to run for a computationally unreasonable length of time before a single event of interest occurred.&amp;lt;ref name=&amp;quot;ltd-docs&amp;quot;&amp;gt;EON: Long Timescale Dynamics. Henkelman Research Group documentation. henkelmanlab.org/research/ltd/.&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
To get around this, EON combines transition state theory with kinetic Monte Carlo in an approach called adaptive kinetic Monte Carlo (aKMC). Rather than drawing transition rates from a predefined table of possible events, aKMC discovers the available transitions on the fly by searching for first-order saddle points around the current state.&amp;lt;ref name=&amp;quot;akmc-docs&amp;quot;&amp;gt;Adaptive kinetic Monte Carlo. EON documentation. henkelmanlab.org/eon/akmc.html.&amp;lt;/ref&amp;gt; Under the harmonic approximation to transition state theory, the rate of an individual transition takes the Arrhenius-like form&lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;k = \nu \, e^{-\Delta E_a / k_B T}&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
where &amp;lt;math&amp;gt;\Delta E_a&amp;lt;/math&amp;gt; is the energy barrier between the initial minimum and the saddle point, &amp;lt;math&amp;gt;T&amp;lt;/math&amp;gt; is the temperature, &amp;lt;math&amp;gt;k_B&amp;lt;/math&amp;gt; is the [[wikipedia:Boltzmann constant|Boltzmann constant]], and the prefactor &amp;lt;math&amp;gt;\nu&amp;lt;/math&amp;gt; is calculated from the [[wikipedia:normal mode|vibrational modes]] at the minimum and the saddle point.&amp;lt;ref name=&amp;quot;akmc-docs&amp;quot; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Saddle points themselves were located with the dimer method, in which two closely spaced replicas of the system (&amp;quot;the dimer&amp;quot;) are used to estimate the direction of lowest curvature on the potential energy surface using only first derivatives of the energy, avoiding the cost of computing a full [[wikipedia:Hessian matrix|Hessian]]:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;\mathbf{R}_{1,2} = \mathbf{R}_0 \pm \Delta R\,\hat{N}&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
The dimer is rotated to align with this minimum mode and then walked uphill along it until it converges on a saddle point.&amp;lt;ref name=&amp;quot;dimer1999&amp;quot; /&amp;gt; Besides aKMC, the EON software also implemented [[wikipedia:parallel replica dynamics|parallel replica dynamics]], [[wikipedia:hyperdynamics|hyperdynamics]], and global optimization methods including [[wikipedia:simulated annealing|simulated annealing]], [[wikipedia:basin hopping|basin hopping]], and minima hopping.&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[File:Potential Energy Surface and Corresponding Reaction Coordinate Diagram.png|thumb|A potential energy surface with a saddle point separating two minima, the kind of feature EON&amp;#039;s dimer method searches for.]]&lt;br /&gt;
&lt;br /&gt;
== Software architecture ==&lt;br /&gt;
EON used a client/server design: computationally intensive force and energy evaluations ran on volunteer client machines, while a central server managed the overall state-to-state evolution of the simulation, for example driving the kinetic Monte Carlo bookkeeping in aKMC runs. The server was written in [[wikipedia:Python (programming language)|Python]] and the client in [[wikipedia:C++|C++]], the latter chosen so that a self-contained compiled executable could be distributed easily to volunteers.&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt; Beyond BOINC, the same codebase could also run on a single workstation, on cluster queuing systems, and on large parallel machines via [[wikipedia:Message Passing Interface|MPI]].&amp;lt;ref name=&amp;quot;ltd-docs&amp;quot; /&amp;gt; The code was released under version 3 of the [[wikipedia:GNU General Public License|GNU General Public License]].&amp;lt;ref name=&amp;quot;wiki-eon&amp;quot; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Discontinuation ==&lt;br /&gt;
On 26 May 2014, the eOn team posted to the BOINC forums that the project was being retired from the BOINC network.&amp;lt;ref name=&amp;quot;discontinuation&amp;quot;&amp;gt;Announcement that the eOn project has been discontinued. BOINC Forums, thread 9281. {{Webarchive|url=https://web.archive.org/web/20140714231802/http://boinc.berkeley.edu/dev/forum_thread.php?id=9281|date=14 July 2014}}.&amp;lt;/ref&amp;gt; Volunteer forums reported that the eOn server was taken offline shortly afterward, with one community post noting that it had been &amp;quot;retired&amp;quot; with little fanfare and that &amp;quot;the server has been switched off already.&amp;quot;&amp;lt;ref name=&amp;quot;tsbt-retired&amp;quot;&amp;gt;eOn retired. The Scottish BOINC Team forum. May 2014.&amp;lt;/ref&amp;gt; A follow-up post from the project team described the decision as a practical one: the project had been useful but had become increasingly cumbersome to maintain relative to the group&amp;#039;s other computational resources.&amp;lt;ref name=&amp;quot;tsbt-retired&amp;quot; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Legacy ==&lt;br /&gt;
The retirement of the BOINC-facing eOn2 project did not end development of the underlying EON software. Around 2018, the codebase was relicensed from GPL-3.0 to the [[wikipedia:BSD licenses|BSD 3-Clause license]] so that it could be incorporated into the Amsterdam Modeling Suite, a commercial computational chemistry platform.&amp;lt;ref name=&amp;quot;goswami-blog&amp;quot;&amp;gt;Goswami, Rohit. [https://rgoswami.me/posts/eon-acad-foss/ Reconciling eOn for Academia and Open Source]. Personal blog. Retrieved 2026.&amp;lt;/ref&amp;gt; From 2019 onward, the code was migrated from its original Subversion repository to GitHub, and it continues to be maintained as an open-source research code, including a Gaussian process-accelerated dimer method contributed as part of doctoral work associated with the University of Iceland.&amp;lt;ref name=&amp;quot;goswami-blog&amp;quot; /&amp;gt; This ongoing development is separate from the discontinued volunteer computing project and does not distribute work to BOINC volunteers.&lt;br /&gt;
&lt;br /&gt;
== Publications ==&lt;br /&gt;
The Berkeley BOINC project maintains a list of [https://boinc.berkeley.edu/pubs.php#EOn publications with results arising from BOINC-based computing], including work that made use of the eOn volunteer computing project:&amp;lt;ref name=&amp;quot;pubs-boinc&amp;quot;&amp;gt;Publications by BOINC Projects. boinc.berkeley.edu/pubs.php. Maintained by Alex Piskun.&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
# Chill, Samuel T., Matthew Welborn, Rye Terrell, Liang Zhang, Jean-Claude Berthet, Andreas Pedersen, Hannes Jónsson, Graeme Henkelman. [https://iopscience.iop.org/article/10.1088/0965-0393/22/5/055002 EON: software for long time simulations of atomic scale systems]. &amp;#039;&amp;#039;Modelling and Simulation in Materials Science and Engineering&amp;#039;&amp;#039; 22(5), 055002 (2014). {{DOI|10.1088/0965-0393/22/5/055002}}.&lt;br /&gt;
# Pedersen, Andreas, Graeme Henkelman, Jakob Schiøtz, Hannes Jónsson. [https://iopscience.iop.org/article/10.1088/1367-2630/11/7/073034 Long time scale simulation of a grain boundary in copper]. &amp;#039;&amp;#039;New Journal of Physics&amp;#039;&amp;#039; 11(7), 073034 (2009). {{DOI|10.1088/1367-2630/11/7/073034}}.&lt;br /&gt;
# Mei, Donghai, Lijun Xu, Graeme Henkelman. [https://pubs.acs.org/doi/10.1021/jp808211q Potential Energy Surface of Methanol Decomposition on Cu(110)]. &amp;#039;&amp;#039;The Journal of Physical Chemistry C&amp;#039;&amp;#039; (2009). {{DOI|10.1021/jp808211q}}.&lt;br /&gt;
# Xu, Lijun, Donghai Mei, Graeme Henkelman. [http://aip.scitation.org/doi/10.1063/1.3281688 Adaptive kinetic Monte Carlo simulation of methanol decomposition on Cu(100)]. &amp;#039;&amp;#039;The Journal of Chemical Physics&amp;#039;&amp;#039; (2009). {{DOI|10.1063/1.3281688}}.&lt;br /&gt;
# Xu, Lijun, Graeme Henkelman. [http://aip.scitation.org/doi/10.1063/1.2976010 Adaptive kinetic Monte Carlo for first-principles accelerated dynamics]. &amp;#039;&amp;#039;The Journal of Chemical Physics&amp;#039;&amp;#039; (2008). {{DOI|10.1063/1.2976010}}.&lt;br /&gt;
# Henkelman, Graeme, Hannes Jónsson. [https://link.aps.org/doi/10.1103/PhysRevLett.90.116101 Multiple Time Scale Simulations of Metal Crystal Growth Reveal the Importance of Multiatom Surface Processes]. &amp;#039;&amp;#039;Physical Review Letters&amp;#039;&amp;#039; (2003). {{DOI|10.1103/PhysRevLett.90.116101}}.&lt;br /&gt;
&lt;br /&gt;
[[File:TiltAndTwistBoundaries remade.JPG|thumb|Illustration of tilt and twist grain boundaries, the kind of defect studied in the 2009 EON simulation of a copper grain boundary.]]&lt;br /&gt;
&lt;br /&gt;
No additional eOn-specific publications beyond these six were found in the BOINC publications registry at the time of writing.&lt;br /&gt;
&lt;br /&gt;
== See also ==&lt;br /&gt;
* [[BOINC projects]]&lt;br /&gt;
* [[Einstein@Home]]&lt;br /&gt;
* [[The Lattice Project]]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
{{Reflist}}&lt;br /&gt;
&lt;br /&gt;
== External links ==&lt;br /&gt;
* {{URL|https://web.archive.org/http://eon.ices.utexas.edu/eon2/|Archived eOn2 project homepage}}&lt;br /&gt;
* {{URL|https://github.com/TheochemUI/eOn|EON software repository (post-BOINC continuation)}}&lt;br /&gt;
* {{URL|https://henkelmanlab.org/research/ltd/|Henkelman Research Group: Long Timescale Dynamics}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Completed BOINC projects]]&lt;br /&gt;
[[Category:Chemistry]]&lt;br /&gt;
[[Category:Materials science]]&lt;br /&gt;
[[Category:University of Texas at Austin]]&lt;/div&gt;</summary>
		<author><name>Al Piskun</name></author>
	</entry>
</feed>