Another thing I forgot to mention is that Hotspot still likes allocating memory in 256k chunks. So -XX:MaxPermSize=256M is more ideal
All of this will change with Java8, where PermGen is going to be replaced similar to JRockit... but that's for another day. --- Regards, Saptarshi PURKAYASTHA My Tech Blog: http://sunnytalkstech.blogspot.com You Live by CHOICE, Not by CHANCE On 23 February 2013 02:22, Saptarshi Purkayastha <sun...@gmail.com> wrote: > With your settings, I think there will be too much paging happening and > the heap space is the worst place to page. > The reason for the paging is you might have nearly free 2.5GB RAM > available (windows might use the remaining) and you've set the heap space > from 3Gb to 6Gb, which will always nearly page. > > So, I would say the -Xms1024m -Xmx1500m should be safest for 4Gb, given > that you'd run parallel GC in some memory that will be beyond the heap. > All of this assuming that you have x64 Java as well... just having windows > x64 won't be enough. > > --- > Regards, > Saptarshi PURKAYASTHA > > My Tech Blog: http://sunnytalkstech.blogspot.com > You Live by CHOICE, Not by CHANCE > > > On 22 February 2013 22:53, Wilson,Randy <rwil...@msh.org> wrote: > >> Does anyone have suggestions for the optimal settings for JAVA_OPTS on >> a 4 gig Windows 7 64 bit OS?**** >> >> ** ** >> >> My computer hangs every time I try to run the DATAMART process.**** >> >> ** ** >> >> Current settings are: SET JAVA_OPTS=-Xmx6000m -Xms3000m >> -XX:MaxPermSize=500m -XX:PermSize=300m**** >> >> ** ** >> >> *Randy Wilson***** >> >> ** ** >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~dhis2-users >> Post to : dhis2-users@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~dhis2-users >> More help : https://help.launchpad.net/ListHelp >> >> >
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