-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Chuck,
On 6/22/2010 5:00 PM, Caldarale, Charles R wrote: >> From: Christopher Schultz [mailto:ch...@christopherschultz.net] >> Subject: Re: Showing Tomcat Memory Utilization with 'top' >> >> Also, I believe VIRT includes memory shared with other processes > > Doesn't RES also include shared pages - anything that's in the memory > map of the process? (I can't remember exactly how that works, but > the shared pages have to be accounted for somewhere.) This is reaching the limits of my knowledge as well. I could imagine shared memory not being counted "against" every process but it also quite makes sense that it would. >> so if you have 50MiB of Java system classes loaded and a modern >> JVM which shares them among running JVMs > > Note that only the client HotSpot JVM shares classes; the server > version does not. (The sharing is really class templates, not the > class objects themselves.) I didn't realize that the server JVM didn't share class templates. Do you have any ideas why not? It seems to be a relatively cheap optimization when multiple JVMs are in use, and shouldn't include too much overhead for either the process or the OS if there's no actual sharing going on in a single-JVM scenario. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkwiPcQACgkQ9CaO5/Lv0PA9oACcCAVoKQZ3F9DG5iPmEusC0nSt k/wAnjfHzZpGU2lceqY7cltkJ/EUiNk9 =sw+t -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
