<!-- keep this as a security measure: #uncomment if the subject should only be modifiable by the listed groups * Set ALLOWTOPICCHANGE = Main.TWikiAdminGroup,Main.CMSAdminGroup * Set ALLOWTOPICRENAME = Main.TWikiAdminGroup,Main.CMSAdminGroup #uncomment this if you want the page only be viewable by the listed groups * Set ALLOWTOPICVIEW = Main.TWikiAdminGroup,Main.CMSAdminGroup --> %TOC% %ICON{arrowleft}% Go to [[CMSTier3LogXX][previous page]] / [[CMSTier3LogXX][next page]] of Tier3 site log %M% ---+ 26. 07. 2012 Enforcing flexible memory limits on SGE Up to now we didn't apply memory limits on SGE but because we got 5 servers crashes in the last days now it's time to enforce them; said that I propose to: * Assign =h_vmem= values to each host according to its memory capacity, so for instance =25G= to =t3wn[10-29]= and =50G= to =t3wn[30-40]=. We'll run for each WN: * qconf -se WN * qconf -aattr exechost complex_values h_vmem=25G WN * qconf -se WN * Configure the =h_vmem= complex like a forced consumable with a default value; so switching: * its =consumable= property from =NO= to =YES= * its =requestable= property from =YES= to =FORCED= * its default value from =0= to =3G=. * Run =qconf -sc= to see the complexes before and after the change. * For each queue =Q= configure the hard limit =h_vmem= like =4G=, so users can ask more than the default =3G= but <= =4G=. * The limit =h_vmem= is per server slot and it's an effective method to enforce an upper limit on =h_vmem= but even better we might program a =JVS= to reject the unsatisfiable job requests instead to leave them queued forever. * Our =JSV= can be installed like a forced check into =/gridware/sge/util/sge_request=. * We modify the file =/etc/security/limits.conf= to enforce the memory the limit '@cms as 4500000' like a final security mechanism would be SGE stop to respect its =h_vmem= deal or becasue of an SGE Admin misconfiguration. -- Main.FabioMartinelli - 2012-07-26 ---------------- %ICON{arrowleft}% Go to [[CMSTier3LogXX][previous page]] / [[CMSTier3LogXX][next page]] of Tier3 site log %M%
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Topic revision: r1 - 2012-07-26 - FabioMartinelli
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