-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 John,
On 9/6/13 1:43 PM, John Beaulaurier -X (jbeaulau - ADVANCED NETWORK INFORMATION INC at Cisco) wrote: > Is there a good formula for JDK Heap parameters for Tomcat 7 as it > relates to hardware, or should ergonomics be allowed to define, or > is it more application driven? It's much more application-driven. I've been able to launch Tomcat in a 12MiB heap when using a 32-bit JVM or a 64-bit JVM with compressed OOPs. If you use a lot of JSPs -- especially ones that use many nested custom tags -- then you may want to give yourself a bit of room for the various buffers and caches of things that tend to accumulate under those circumstances. After that, everything is up to your webapp. Another thing you have to watch out for is your PermGen space: if you have many many classes being loaded (like for example if you use Spring, which seems to load somewhere in the neighborhood of 100 million classes), then you'll probably need to expand PermGen. A server I recently configured to run JasperServer (which happens to use Spring) required me to increase the PermGen space from the default (64MiB?) to 128MiB just to be able to run a very simple report, and I have about 300KiB left, so I may have to go higher once we start running lots of reports on it. We comfortably ran our primary application in production with a 64MiB heap for several years before we outgrew that. These days, we run with a 512MiB heap due to increased usage, a switch to a 64-bit JVM, and the availability of much more RAM (we started with 2GiB servers, now we have 8GiB servers). My recommendation is to set up some reasonable load tests and run under different configurations. IMO, if having a huge heap isn't necessary, then don't run with one. > OS: RHEL 5.5 Kernel: 2.6.18-194.8.1.el5 Apache Tomcat: 7.0.39 You could use a slight upgrade. You should move up to 7.0.43 when it comes out -- should be fairly soon. > JDK: 1.6.0_45 JDK 1.6 is officially EOL (i.e. dead) so you should really move up to Java 7 as soon as possible. If you get started soon, you might even make it before Java 8 is released. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJSKkEWAAoJEBzwKT+lPKRYY2QP/A3EP8D5DeJ5FLV0GN1C4EDg iH2r8ltPVzJ3NqIW5sWS8HUiVvM7MNYmYB3HynJz5HdJdhigRI9n8uIBl4fE3KXm HZJIdhziU750RTj/Acuz/Q+yw5Qu5cJfOJeAUlDKLYZSHK4yoPsAHh934t1xaopv Ij9O9t6vMtSb2W1gAXrcp04jqnlEYV02AbdSjUzpkBp1vZXsIk9x89XNfX7i9AKm ZxBhTxiyR7SgdJRmaZ+/n9bhyVM8ZBGfgfNiLqt9xiigl4+Y7WSR5y3ki7SoPn1i PlqFwHVSXCYMgiVfOdfNSLqnWu11nFuwSWlus7ySyzEMWgtAFREb71UHmHk2w2O8 bgwafh7WhGlrDgEIAMMG1oRQxlYWgvYwegm6DAWfUnHwf04Z94WoFGUzrvapAQRm 41bu2o+lm1rLHAYFOY/fQEH1LB9uuQ+IjtjIKhAcI52B1Vikz462zuF0qVE+f728 yyGtd6w4KnDJiZJOw/ALrTx5a3u+XMCzG49DqWkNTQKJFYswr8s38UfVbHPFmqCc 0pN8T40N9Wsjo+rNmswTNeQE+etMCWAH2Z52KBuvHLeQXWEZRCUofg0gXdlwuBB6 CwWPgjTuw9mWW1pN2vyIBEIn7K5l2IAcVifhCzUIi9BZTsEByZIRnSaemotnIz+b 383xCY8qCxrb6/WVmVOM =8Elw -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
