Hello,
On Thu, Dec 19, 2013 at 12:11 AM, Christopher Schultz < ch...@christopherschultz.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > All, > > I was recently discussing garbage collectors with a friend (yes, an > exciting conversation) and I was wondering what the folks in the > Tomcat community were using for their garbage collection needs. > > I'd like to run an informal poll. Feel free to reply to just me > directly if you'd like to protect your reputation or not clog the list > or to the whole list if you'd prefer. > > I know there are lots of lurkers on the list who rarely post and I'd > encourage them to reply as well even if they don't feel like they are > running anything of any importance. > I have too many (or consult many) but I will take the most visited. > > So, here are my questions: > > 1. What JVM are you using? > > [ ] Sun/Oracle/OpenJDK Java 1.5 > [ ] IBM Java 1.5 > [ ] Sun/Oracle/OpenJDK Java 1.6 > [ ] IBM Java 1.6 > [x] Sun/Oracle/OpenJDK Java 1.7 > [ ] IBM Java 1.7 > [ ] Sun/Oracle/OpenJDK Java 1.8 > [ ] Something else - please specify: > > 2. What kind of web application are you running? > > [ ] A toy, a research project, or something with virtually no use > [ ] A moderately busy web site (<1M requests/mo/server) > [ ] A moderately busy web site (<10M requests/mo/server) > [ ] A busy web site (10M - 100M requests/mo/server) > [x] A super-busy web site > > 3. What is your total heap size? > 14 GB > > 4. Are you explicitly specifying a Garbage Collector? If not, just say > so and skip the rest of the questions. > CMS + Options > > 5. What led you to use [GC X] instead of the JVM's default collector? > GC pauses > > 6. Did you do any actual performance testing to see if the switch from > the default to [GC X] made any difference? > Yes > > 6. Have you spent a lot of time tuning [GC X]? > Yes :-) > > 7. Did your tuning exercise yield any useful results? > 45 sec pauses eliminated > > 8. Did your users notice any difference after you implemented [GC X], > or just your own load-testing team? > I assume so, we had servers taken out of the pool by lb due to connection timeouts. > > If you think there's anything else I should know about your experience > with [GC X], please let me know. > Well, it changes from version to version, so each new jdk version means start from beginning. Some of the options in Java 6 do not make sense in Java 7 and so on. But in general CMS is my personal choice for low-pause collector, I haven't yet seen working G1. > > Thanks, > - -chris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.15 (Darwin) > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJSsiu1AAoJEBzwKT+lPKRYdAsQAKWytJHCv3Kj8p8vWoDsCgEO > LZd6Yq/j8j5uID+UM4pq8FgRN03TmmjujOZaQ769ljZqtd9w+VFf2+zPbt7gPqGI > SDFACw+VtQxEmVUDhE4H0tBfz7h7SZ8QOPTyScx384mDAvRzJKaeGPwrbJBogvaW > cvyzNtgFDywpNTCjyKT3JLoUfjm+CjLryK6bo3+6I7I3ikhyHVsYZHuls5DG9LNf > mYJ2KGOeYN332VcJWaCElLiK2HQrFY+BxfJ+f7mH6ztmq0iawulg8bApUo+vllwD > r2Ble1kc0pgwMn4jOoRAP1R9IaFSsPX8a87T1uFtnRS0vdW4BRy6O5xE1wjFQPuq > 52jcFf7i5ZiFYIXO1/vWw9FjZ2DBXnjMuEEdPf5laHNXKJIMCnulKOC6W48eS6Rq > E7hRa7h+RQ0CVk9Pjp2NGdiPAeRL44LRDWaPWmTH7iXUcaWg2IxC3OXXyezP6aPE > 7DrKhW9jjxbQG/H3GXzX9Sptee+osfPUaU6sOND8EYUYLojg6b6XLxfbjLpedrsh > eHC1zksbc0WkZxhnXDSPZV4+4y0djC0X+tNX/DPCs/wPpXEqmqeGSXc7sbnXoLYf > 49jGRa6pz8MR1da5D78lSCxm407+UNJzbJuGfHFzjYqxjQEULKJTug4Z7Hs0MGne > XzAqLyKxfgW0/4P5QzD6 > =EFcD > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
