{"id":5893,"date":"2016-10-25T08:58:28","date_gmt":"2016-10-25T13:58:28","guid":{"rendered":"http:\/\/appcrawler.com\/wordpress\/?p=5893"},"modified":"2016-10-25T08:58:28","modified_gmt":"2016-10-25T13:58:28","slug":"predict-full-cms-collection","status":"publish","type":"post","link":"http:\/\/appcrawler.com\/wordpress\/2016\/10\/25\/predict-full-cms-collection\/","title":{"rendered":"Predict full CMS collection"},"content":{"rendered":"

((heap * cms fraction) – current heap used (young and tenured)) \/ growth rate = prediction<\/p>\n

Sample data from GC log…<\/p>\n

\r\n: 4499906K->310178K(4718592K), 0.2461130 secs] 10382742K->6214227K(12058624K), 0.2469460 secs] [Times: user=2.77 sys=0.03, real=0.25 secs]\r\n2016-10-25T09:41:02.431-0400: 48708.056: [GC 48708.056: [ParNew48708.198: [SoftReference, 0 refs, 0.0020420 secs]48708.200: [WeakReference, 270805 refs, 0.0164270 secs]48708.216: [FinalReference, 64232 refs, 0.0398110 secs]48708.256: [PhantomReference, 4 refs, 0.0014000 secs]48708.258: [JNI Weak Reference, 0.0152670 secs]\r\n: 4504482K->337875K(4718592K), 0.2190810 secs] 10408531K->6262051K(12058624K), 0.2199090 secs] [Times: user=2.43 sys=0.04, real=0.22 secs]\r\n2016-10-25T09:41:27.014-0400: 48732.639: [GC 48732.639: [ParNew48732.802: [SoftReference, 0 refs, 0.0025140 secs]48732.805: [WeakReference, 51342 refs, 0.0058420 secs]48732.810: [FinalReference, 65488 refs, 0.0444180 secs]48732.855: [PhantomReference, 4 refs, 0.0014280 secs]48732.856: [JNI Weak Reference, 0.0178460 secs]\r\n: 4532179K->321998K(4718592K), 0.2363660 secs] 10456355K->6278650K(12058624K), 0.2371750 secs] [Times: user=2.67 sys=0.04, real=0.24 secs]\r\n2016-10-25T09:41:52.724-0400: 48758.349: [GC 48758.349: [ParNew48758.467: [SoftReference, 0 refs, 0.0025300 secs]48758.469: [WeakReference, 50217 refs, 0.0048760 secs]48758.474: [FinalReference, 62385 refs, 0.0401380 secs]48758.515: [PhantomReference, 0 refs, 0.0017490 secs]48758.516: [JNI Weak Reference, 0.0189490 secs]\r\n: 4516302K->268024K(4718592K), 0.1880510 secs] 10472954K->6249999K(12058624K), 0.1888660 secs] [Times: user=2.04 sys=0.03, real=0.19 secs]\r\n2016-10-25T09:42:17.839-0400: 48783.464: [GC 48783.465: [ParNew48783.572: [SoftReference, 0 refs, 0.0022150 secs]48783.574: [WeakReference, 52409 refs, 0.0041950 secs]48783.578: [FinalReference, 63089 refs, 0.0407380 secs]48783.619: [PhantomReference, 2 refs, 0.0025640 secs]48783.622: [JNI Weak Reference, 0.0146210 secs]\r\n<\/pre>\n
12058624 – 10382742 = 1675882
\n12058624 – 10408531 = 1650093, 25789 growth in 25 seconds
\n12058624 – 10456355 = 1602269, 47824 growth in 25 seconds
\n12058624 – 10472954 = 1585670, 16599 growth in 25 seconds<\/p>\n
So about 1000K per second, roughly on average.<\/p>\n
We have 12058624 * 0.92 (default CMS fraction) = 11093934
\n11093934 – 10472954 = 620980K \/ 1000K = 620 seconds, or roughly ten minutes until full CMS occurs.<\/p>\n","protected":false},"excerpt":{"rendered":"
((heap * cms fraction) – current heap used (young and tenured)) \/ growth rate = prediction Sample data from GC log… : 4499906K->310178K(4718592K), 0.2461130 secs] 10382742K->6214227K(12058624K), 0.2469460 secs] [Times: user=2.77 sys=0.03, real=0.25 secs] 2016-10-25T09:41:02.431-0400: 48708.056: [GC 48708.056: [ParNew48708.198: [SoftReference, 0…<\/p>\n
Read more →<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"footnotes":""},"categories":[7,77],"tags":[],"_links":{"self":[{"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/posts\/5893"}],"collection":[{"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/comments?post=5893"}],"version-history":[{"count":2,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/posts\/5893\/revisions"}],"predecessor-version":[{"id":6441,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/posts\/5893\/revisions\/6441"}],"wp:attachment":[{"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/media?parent=5893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/categories?post=5893"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/appcrawler.com\/wordpress\/wp-json\/wp\/v2\/tags?post=5893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}