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There are some sites that suggest to cut down on garbage collection set -Xmx and --Xms to the same values. That is what we have been using for awhile and it seems to keep things relatively stable. Plus giving it as much memory as possible, -Roy On Jun 1, 2011, at 8:57 AM, Rich Signell wrote: > Ethan, > > According this this article: > http://www.petefreitag.com/item/746.cfm > it says > > the "OutOfMemoryError - GC overhead limit exceeded" exception is > thrown by the garbage collector when it is spending way too much time > collecting garbage. This error essentially means that you need to add > more memory, or reconfigure your garbage collection arguments. > > So it seems like the same issue. Our settings are: > export JAVA_OPTS="-XX:MaxPermSize=256M -Xmx2048m -Xms512m -server > -Djava.awt.headless=true" > > -Rich > > On Wed, Jun 1, 2011 at 11:47 AM, Ethan Davis <edavis@xxxxxxxxxxxxxxxx> wrote: >> Hi Rich, >> >> We haven't ever really fiddled with GC parameters, instead we leave the >> whole GC settings up to the "-server" JVM. >> >> We've never seen this error on our servers. It doesn't look like your >> error message is related to the "OutOfMemoryError: PermGen space" issue >> so I'm not sure "-XX:MaxPermSize" will help. >> >> Have you tried adding more memory to the heap ("-Xmx")? And if so did it >> help? >> >> Ethan >> >> >> On 6/1/2011 9:24 AM, Rich Signell wrote: >>> THREDDS folk, >>> >>> Have folks played around with Garbage Collection tuning parameters >>> besides "-XX:MaxPermSize" to help tomcat/TDS permgen errors? >>> >>> Our TDS tomcat is throwing "GC overhead limit exceeded" errors again. >>> I know on the Unidata TDS page >>> http://www.unidata.ucar.edu/projects/THREDDS/tech/tds4.2/tutorial/BasicTomcatAndTDSSecurity.html >>> it says the only thing you can do is increase -XX:MaxPermSize, which >>> only delays the problem, solved only by restarting tomcat. >>> >>> But in this Garbage Collection tuning article >>> http://www.petefreitag.com/articles/gctuning/ >>> they describe many different options, and I'm wondering whether folks >>> have tried using these, or whether they just don't do any good. >>> >>> Thanks, >>> Rich >> >> _______________________________________________ >> thredds mailing list >> thredds@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> > > > > -- > Dr. Richard P. Signell (508) 457-2229 > USGS, 384 Woods Hole Rd. > Woods Hole, MA 02543-1598 > > _______________________________________________ > thredds mailing list > thredds@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ ********************** "The contents of this message do not reflect any position of the U.S. Government or NOAA." ********************** Roy Mendelssohn Supervisory Operations Research Analyst NOAA/NMFS Environmental Research Division Southwest Fisheries Science Center 1352 Lighthouse Avenue Pacific Grove, CA 93950-2097 e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address) voice: (831)-648-9029 fax: (831)-648-8440 www: http://www.pfeg.noaa.gov/ "Old age and treachery will overcome youth and skill." "From those who have been given much, much will be expected"
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