-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Eric,
On 3/19/15 11:15 AM, Eric Robinson wrote: > Thanks for the feedback. We run various versions of RHEL (5.5 to > 6.3) x64. Tomcat is mostly 6.0.18. Java is mostly 6u21 x 64. Time to upgrade. Tomcat is hideously out of date (probably because you are using RedHat's Tomcat package), at least by version number. I'm not sure what RedHat does (if anything) about security fixes, etc. but a vanilla 6.0.18 is probably vulnerable and has been for a very long time. Java 1.6 is EOL and Java 1.7 is getting close. I strongly advise you to move up to Tomcat 8.0.20 and Java 1.8 and start developing and testing your application against those versions. > Typical startup options looks like this... > > JAVA_OPTS="-Xms192M -Xmx384M \ -XX:MaxPermSize=128M \ Those seem reasonable, except maybe not PermGen. Are you increasing it or reducing it from the default on your platform? > The memory allocation seems low to you because we run many > instances of tomcat on the same server. Although the servers have > 32-64GB of RAM, the individual tomcat/java instances are kept > fairly low. We ran for years in a 64MiB heap. Then we got enough traffic that sessions required us to expand our heaps. If you can run in a small heap, great. But keep your eye on what's happening with your users; you may find that you have outgrown your old heap settings. > We are trying to be proactive by watching the memory usage numbers > in the thread dumps. Heap dumps? > When we see a number that could be getting too close for comfort, > we increase the memory allocation slightly and restart the tomcat. > (We can get away with this in production because of the way our > load balancing works it does not cause any downtime for clients.) > > Any thoughts on what numbers we should watch closest? The from > space is always mostly used, but that does not appear to cause a > problem. http://wiki.apache.org/tomcat/FAQ/Monitoring - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJVCxEOAAoJEBzwKT+lPKRYqI0P/iIGZ5NfK5yAxdSlSFoIMQcS alKJqPBCPhEe6mECyBN+KB24Ci8YvJDtdWzMe56BgJ0uUvCKmlfRxO4VTyUhJH+X WxkkRoZ2PylZNtwj9mvs/IFat09nBTVCeUy3e4ZSE4bEN30HHe9MgS3bz+Tyvmbt UCONb+JrjHAFvwcSTACdgJHK62TIACLkJkZ534JshPkaTVIpRqGSgx2OimoAk4k8 Z7K7E8uQlJg65XG+uR7bXHZ+mHGdwL6yT574OGb+FreLW5fraF2LmUzlEsP62ynI 50oUXGEoOUM1LLGNDxmKXrCuKXiuxd2yqC+TbHtfdBlfXwvS3AUMldZ3Q+2ZtDUe xF4v5y25OO4pYoGJp7vQNQGmfWTI6DJ+Ru0vnULnqsMLuBKsIfCsbnB9hV2Fx9e4 8rzIgc1YyuIACFi78Pr1Ot95mBw14C/802a2ypJl+6UCvWZfbU+/CkdhcJ44Mnf7 VyD5beBJJy2Dt0m8lcIxI6vw2Pe2msGLHLLPlu3yhewOc4ii1DIE5gJ2IrXxncLY YaZqG7rq8TDR5y88xdBFkM3gLugZR/v30S82dnt+sTlIOMDyA750poKY7L8BFK+z a7dSRTKpJd1GYqKo0pMsq0YV/PwVmODiCQp6XNLkvyj68Cp3N4fRF4fOZLkhPjJ/ aeVTxYJX97p946/DlHMh =p3WY -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
