-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Howard,
On 4/3/13 4:15 PM, Howard W. Smith, Jr. wrote: > On Tue, Apr 2, 2013 at 5:12 PM, Christopher Schultz < > ch...@christopherschultz.net> wrote: > >> If you don't re-deploy your webapp, then daily rolling Tomcat >> restarts are not necessary. I wonder why you are re-deploying >> your web application so many times? > > As a new tomcat user and still somewhat junior java/jsf developer, > I restart tomcat whenever I have new software changes to > deploy-and-want-to-run-on the production server. sometimes, I > deploy-and-restart multiple times per day, but sometimes, I'm able > to let tomcat/tomee run for days without restart. That's not really conducive to high-availability. Are you using Tomcat's parallel-deployment feature? >> We run several Tomcats in parallel with modest heaps (less than >> 512MiB each) and they can run for months before we stop them for >> upgrades. It *is* possible to run JVMs without running out of >> memory... > > > I too, have not experienced any OOME, and recently, per what I > have seen-and-read of other (more senior java developers than > myself), I have decreased memory settings in my java options on > tomcat7w.exe (see below). > > -Xmx1024m -XX:MaxPermSize=384m -XX:+UseTLAB > -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled Your heap settings should be tailored to your environment and usage scenarios. You can find "conventional wisdom" that recommends pretty much any heap configuration you want. The only thing that I can consistently recommend to anyone is to set -Xms and -Xmx to the same value, since on a server you're pretty much guaranteed to get to -Xmx pretty quickly, anwyay. You may as well not thrash the heap space(s) getting there. > My Windows 2008 R2 Server (64bit 32GB RAM) never seems to get > higher than 1% CPU, and I think I do have memory leaks somewhere in > the app, but FWIW (in heap dump in java visual vm), the memory > leaks seem to be tomee leaks. In Java Visual VM, I do see the > memory grow over time, as the app is used (without a tomcat restart > or re-deploy of app and then restart tomcat), but I still have not > seen OOME...'yet'. What does your heap usage graph look like? It should be a nice sawtooth-looking thing, like this: /|/|/|/|/|/|/|/|/| You'll see that the small sawtooth pattern grows in basis over time and then there is a major GC which will reset you back to some baseline, then the process starts over again. If you never get OOMEs, why do you think you have memory leaks? Or that TomEE does? - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJRXcdIAAoJEBzwKT+lPKRYb70P/jI9QtV1+anIXCx04niQNDJP BSipr2ScOQ2DJNNBjwWAth9AqbzC/nKX4fNlqKCSqWmpZf3JyFChFi/nQJajZQRR 3EJEYLXP3YBRPfixRZLrcUw9rrVLs/+apFL4XZCdgkFvrPto201E9ef99ns7Ya+g oBWr51g8Fkx5jeztRmzg+H/8+KVICuHUVXTCBQtuybwTfCyWKFwZs5lfmKiX7oKC 1ts7S6mIhzpFjO+KFxnFWZkM4ch7SADqCe5WhxnOYpjaz7p7d2XGv1iamjsGVKF2 FE1bZvOiyEFga6vlh1TpAFmAnOmHmkHtxNAG6eSLeOfYkxKAqSy4z5O6leoP/tUc Vri2+GIxwyxyUYprTnvQW7S1UTQF6t658itnZXLrnvRr8Oj/7tzmFcScDvajbYUx P8tECk7SENg0Sr6T8tY3VjR+A1c1u8i5k9iLDayVE8zxcDvCA6n2cVmtj/5K3xwe MNWhsr6kfca9q7CU5fIe38ebrsw8+UU4J2TkrtHYUpc9uC1AxXmLcC8LEXCV/IiZ pIHVlIj2VztPODHfpQvPVUH7VkQKu0M3WbeR+OTQDJJs8X7MLou+YFao+3ri0x9/ 09i6VS+AC8E8zqQcl0KNeBJf7kuTKP/lguLcCRby0YC2YuppwHaBcRiECKy1UDZR FB/X9VbiGKGt95lZvZae =X3iQ -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
