-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David,
David Smithson wrote: | Do you know of a better way of getting heap numbers out of Java? | Right now I've got three metrics: jvm_mem_free; jvm_mem_max; | jvm_mem_total. Java has multiple heaps (okay, one heap segmented into several generations), so you might want to find a tool that will give you more detailed information. Search the archives for names of such tools. | Examining the graphs, I see that 'free' and 'total' | are not exact opposites. That's an odd way of expressing their relative inverse relationship. | 'max' doesn't change and I believe this is | set with the option -Xmx2048m. Yes. Max = -Xmx setting while total = the current max (which should be <= Max). | These are the java options relating to the heap: | | -Xmx2048m | -Xms1024m Save yourself some confusion and set -Xmx = -Xms. Admin lore suggests that it's easier on the GC since it will never have to resize the entire heap (and I tend to agree). | -XX:MaxPermSize=256m I've found that unless you are having problems, you probably don't need to set the -X:MaxPermSize setting. | -XX:+UseParallelGC Same here. | Jvm_mem_total creeps up to the max over time (about 2 days): During | that time, jvm_mem_free fluctuates regularly, like this [nice graph]. Sounds just about right: the JVM is allowing the heap to grow from 1GB to the max 2GB you gave it. The free memory fluctuates nicely. I would watch it for a week to make sure you aren't observing a slow memory leak. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkfR/OQACgkQ9CaO5/Lv0PDV7gCgiFj1T9zNd1SItJ7nSqAy6ia/ cUMAn3OdM4s1SasVlYYh4KWOnYAnyitD =AAvT -----END PGP SIGNATURE----- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
