On Mar 17, 2011, at 2:08 AM, Gennady Kushnir wrote: >> Hi, > >>> Finally at about 95 hours I get OutOfMemory error as the heap is >>> limited by default to 64M. >> >> 64M seems small to me for a Java app. > I did not do any memory regulations myself. It is just default on my > absolutely standard deployment system for WO (Xserve G4 , 2GB, MacOS X > 10.5, Java 1.5.0_24) > > I found this 64M doing > ps ax | grep "java" > > It lists all WO apps like this: > /usr/bin/java -XX:NewSize=2m -Xmx64m -Xms32m -DWORootDirectory=/System ...
If you look at the entire line, you will often see these set multiple times with different values. The last one is what is used. Chuck > > So as I understand "-Xmx64m" - that is maximum heap size. > Actual memory usage for whole JVM is about 300M. > >>> So my question is - what should I do now? >>> Is it expected behavior for large WO application? >> >> Using 64M+ of memory is, the increasing heap size is not. > What are other means to increase memory used? > >>> Or such behavior should be considered as my error somewhere in code? >>> So where should I look for memory leaks? >> >> You mentioned before exceptions, that is where I would start. Also check >> that your session sleep(), awake(), and terminate() can never throw an >> exception. If you are getting deadlocked sessions, then the session, page >> cache, and related EOs will never get garbage collected. > > Most exceptions I get now are cased by "java.lang.OutOfMemoryError: > Java heap space" > So that is what I am trying to get rid of. > I get any other exceptions not more often than once a month whereas > OutOfMemoryError comes nearly every 5th day =( > >> Also check that your session sleep(), awake(), and terminate() can never >> throw an exception. > Would I see such exceptions in log if they happen? I did not see any yet. > >> Beyond that, I would try a heap analyzer to see what the objects are that do >> not get collected. > What is "heap analyzer" ? And where can I get it? > > Gennady -- Chuck Hill Senior Consultant / VP Development Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/products/practical_webobjects
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