java - G1GC Strange behavior -


i've decided try g1gc on eclipse mars rc3 javaee developers installation, observed strange behavior:

gcviewer statistics

as can see has run 700 full gcs lifecycle of application, while 30 minor gcs. noticed that minor gcs executed when application under load - when starts , loads lot of stuff, while full gcs when it's idle. (it idle of these 11 hours!) expect when application nothing there no need gc, or @ leas minor gc. monitored memory consumption of eclipse - during idle time never incresed more 130-140 mb, 1 more reason why these full gcs strange.

here eclipse.ini jvm config:

-server -xverify:none -xx:+aggressiveopts -xx:+useg1gc -xx:maxgcpausemillis=100 -xx:+usestringdeduplication -xx:+usecompressedoops -xx:+usecompressedclasspointers -xx:maxmetaspacesize=256m -xloggc:/home/svetlin/software/eclipse/gc.log -xx:+printgcdetails -xx:+printgctimestamps -xx:+printgcdatestamps  -xx:+usegclogfilerotation -xx:numberofgclogfiles=5 -xx:gclogfilesize=20m -xms1g -xmx1g

here gc log: http://pastebin.com/svbe4w1a

java version: openjdk 64-bit server vm (25.45-b02) linux-amd64 jre (1.8.0_45-internal-b14), built on may 17 2015 19:21:01 "buildd" gcc 4.9.2

do have idea why g1gc these full gc when there not need gc @ ?

you suffering system.gc() calls can seen in log:

2015-06-14t14:56:23.682+0300: 12790,173: [full gc (system.gc())  121m->118m(1024m), 0,4524898 secs]    [eden: 4096,0k(561,0m)->0,0b(561,0m) survivors: 0,0b->0,0b heap: 121,7m(1024,0m)->118,2m(1024,0m)], [metaspace: 135216k->135216k(1177600k)]  [times: user=0,71 sys=0,00, real=0,45 secs] 2015-06-14t14:57:23.682+0300: 12850,174: [full gc (system.gc())  121m->118m(1024m), 0,4732930 secs]    [eden: 3072,0k(561,0m)->0,0b(561,0m) survivors: 0,0b->0,0b heap: 121,2m(1024,0m)->118,2m(1024,0m)], [metaspace: 135216k->135216k(1177600k)]  [times: user=0,73 sys=0,00, real=0,47 secs] 2015-06-14t14:58:28.684+0300: 12915,175: [full gc (system.gc())  169m->118m(1024m), 0,4912699 secs]    [eden: 52,0m(561,0m)->0,0b(561,0m) survivors: 0,0b->0,0b heap: 169,9m(1024,0m)->118,8m(1024,0m)], [metaspace: 135601k->135601k(1177600k)]  [times: user=0,74 sys=0,00, real=0,49 secs]

the system.gc() calls seem happen once every minute. run weird plugins cause this?

otherwise, periodic system.gc() calls due java rmi runtime calling them. on older java versions think done every minute increased once every hour. regardless, try setting properties sure:

-dsun.rmi.dgc.server.gcinterval=999999999 -dsun.rmi.dgc.client.gcinterval=999999999

as jvm options.


Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more