-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Chuck,
On 2/21/12 1:06 PM, Caldarale, Charles R wrote: >> From: Christopher Schultz [mailto:ch...@christopherschultz.net] >> Subject: Re: Free Memory vs. Total Memory vs. Max Memory > >> I'll have to do some more reading about the JVM returning memory >> to the OS after the heap shrinks: if the JVM does not return the >> memory, then your most-recent peak-heap-size will dictate the >> amount of memory your process controls until it it shut down. > > It doesn't really matter if the JVM returns the memory to the OS. > Even when not unmapped, the JVM won't try to use it, so the real > memory requirements of the process are reduced. The unused pages > will disappear to the swap file if the RAM is needed for something > else; this will cause an extremely minor hiccup if the load > increases and the JVM decides to expand the heap again and the > pages have to read in (even though the contents are no longer of > interest). Okay, so it sounds like if the environment is such that reducing the heap at intervals is important (many JVMs, peak-memory-load events are rare, etc.) then using Xms < Xmx isn't a bad idea at all. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk9D32oACgkQ9CaO5/Lv0PCssQCfTRXYxOe+4yiaLuzmsW1vnUB5 064AoKhpKa0H1ObhuKJWVv7pmyz/tSuR =GcYu -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
