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</o:shapelayout></xml><![endif]--></head><body lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Arka,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Your approach seems fine. There should be no particular complications, just take sufficient care to ensure that nodes are actually idle. The nodes are essentially stateless for your purpose.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Gareth<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Arka Aloke Bhattacharya [mailto:arkaaloke@gmail.com] <br><b>Sent:</b> Monday, 27 February 2012 10:24 AM<br><b>To:</b> torqueusers@supercluster.org<br><b>Subject:</b> [torqueusers] reducing energy usage of torque<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p>&nbsp;</o:p></p><p class=MsoNormal>Hi everyone,<o:p></o:p></p><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>I am a PhD student at UC Berkeley, and I wanted to add a &quot;turning off idle/underutilized servers&quot; feature&nbsp;to our 100 server torque+maui deployment. However, I want to implement this feature using only existing torque+ maui interfaces and extensions ( i,e <u>without modifying</u> the torque or maui source code in any way ).<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>My proposed way is to&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal>1. monitor the maui queue length , and estimate the number of servers I can switch off.&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal>2. I would then use &quot;pbsnodes -o &lt;nodename&gt;&quot; command to render a certain number of servers offline for scheduling.&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal>3. A bash script would turn the servers off.&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>The servers would be turned back on (and added to the torque nodes list) when the queue length increases beyond a certain threshold.<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>I had two questions :&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>1.&nbsp;Is there any existing open source code which already implements the &quot;turning off idle servers&quot; functionality in torque ?<o:p></o:p></p></div><div><p class=MsoNormal>2. Are there complications that would arise if I implemented the &quot;turning-off idle servers&quot; feature in my proposed way ? [ e.g - Is it possible that after turning off servers, they would lose some state and hence would not get added to the torque &lt;nodes_list&gt; when turned back on? Are there long lived TCP connections which need to be restarted separately ? , etc ]&nbsp;<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>It would be great if anyone could help.<o:p></o:p></p></div><div><p class=MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=MsoNormal>Thanks a lot,<o:p></o:p></p></div><div><p class=MsoNormal>Arka.<o:p></o:p></p></div></div></div></body></html>