JVM 调优 —— GC 长时间停顿问题及解决方法
- - ImportNew垃圾收集器长时间停顿,表现在 Web 页面上可能是页面响应码 500 之类的服务器错误问题,如果是个支付过程可能会导致支付失败,将造成公司的直接经济损失,程序员要尽量避免或者说减少此类情况发生. 并发模式失败(concurrent mode failure). 在 CMS 启动过程中,新生代提升速度过快,老年代收集速度赶不上新生代提升速度.
零. 简介
一. 并发模式失败(concurrent mode failure)
并发模式失败日志:
2016-02-21T13:53:07.974+0800: 171467.254: [GC [1 CMS-initial-mark: 1436199K(1560576K)] 1512927K(2504320K), 0.0618140 secs] [Times: user=0.06 sys=0.00, real=0.07 secs] 2016-02-21T13:53:08.036+0800: 171467.316: [CMS-concurrent-mark-start] 2016-02-21T13:53:08.377+0800: 171467.657: [CMS-concurrent-mark: 0.340/0.340 secs] [Times: user=2.11 sys=0.15, real=0.34 secs] 2016-02-21T13:53:08.377+0800: 171467.657: [CMS-concurrent-preclean-start] 2016-02-21T13:53:08.385+0800: 171467.665: [CMS-concurrent-preclean: 0.008/0.008 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 2016-02-21T13:53:08.385+0800: 171467.665: [CMS-concurrent-abortable-preclean-start] {Heap before GC invocations=88667 (full 45): par new generation total 943744K, used 914399K [0x0000000757000000, 0x0000000797000000, 0x0000000797000000) eden space 838912K, 100% used [0x0000000757000000, 0x000000078a340000, 0x000000078a340000) from space 104832K, 72% used [0x000000078a340000, 0x000000078ecf7d98, 0x00000007909a0000) to space 104832K, 0% used [0x00000007909a0000, 0x00000007909a0000, 0x0000000797000000) concurrent mark-sweep generation total 1560576K, used 1436199K [0x0000000797000000, 0x00000007f6400000, 0x00000007f6400000) concurrent-mark-sweep perm gen total 159744K, used 78413K [0x00000007f6400000, 0x0000000800000000, 0x0000000800000000) 2016-02-21T13:53:09.535+0800: 171468.815: [GC2016-02-21T13:53:09.535+0800: 171468.815: [ParNew Desired survivor size 53673984 bytes, new threshold 6 (max 6) - age 1: 7100568 bytes, 7100568 total - age 2: 4676456 bytes, 11777024 total - age 3: 8773736 bytes, 20550760 total - age 4: 7709744 bytes, 28260504 total - age 5: 10891960 bytes, 39152464 total - age 6: 11735032 bytes, 50887496 total : 914399K->75616K(943744K), 0.0414860 secs] 2350599K->1517225K(2504320K), 0.0417710 secs] [Times: user=0.32 sys=0.05, real=0.05 secs] Heap after GC invocations=88668 (full 45): par new generation total 943744K, used 75616K [0x0000000757000000, 0x0000000797000000, 0x0000000797000000) eden space 838912K, 0% used [0x0000000757000000, 0x0000000757000000, 0x000000078a340000) from space 104832K, 72% used [0x00000007909a0000, 0x0000000795378128, 0x0000000797000000) to space 104832K, 0% used [0x000000078a340000, 0x000000078a340000, 0x00000007909a0000) concurrent mark-sweep generation total 1560576K, used 1441609K [0x0000000797000000, 0x00000007f6400000, 0x00000007f6400000) concurrent-mark-sweep perm gen total 159744K, used 78413K [0x00000007f6400000, 0x0000000800000000, 0x0000000800000000) } 2016-02-21T13:53:10.202+0800: 171469.482: [CMS-concurrent-abortable-preclean: 1.772/1.817 secs] [Times: user=4.94 sys=0.06, real=1.81 secs] 2016-02-21T13:53:10.204+0800: 171469.483: [GC[YG occupancy: 497152 K (943744 K)]2016-02-21T13:53:10.204+0800: 171469.483: [Rescan (parallel) , 1.3691900 secs]2016-02-21T13:53:11.573+0800: 171470.853: [weak refs processing, 0.1009300 secs]2016-02-21T13:53:11.674+0800: 1714 70.954: [class unloading, 0.0153470 secs]2016-02-21T13:53:11.689+0800: 171470.969: [scrub symbol table, 0.0110770 secs]2016-02-21T13:53:11.700+0800: 171470.980: [scrub string table, 0.0016360 secs] [1 CMS-remark: 1441609K(1560576K)] 1938761K(2504320K), 1.5079530 secs] [Ti mes: user=13.01 sys=0.08, real=1.51 secs] 2016-02-21T13:53:11.712+0800: 171470.992: [CMS-concurrent-sweep-start] {Heap before GC invocations=88668 (full 45): par new generation total 943744K, used 914528K [0x0000000757000000, 0x0000000797000000, 0x0000000797000000) eden space 838912K, 100% used [0x0000000757000000, 0x000000078a340000, 0x000000078a340000) from space 104832K, 72% used [0x00000007909a0000, 0x0000000795378128, 0x0000000797000000) to space 104832K, 0% used [0x000000078a340000, 0x000000078a340000, 0x00000007909a0000) concurrent mark-sweep generation total 1560576K, used 1441606K [0x0000000797000000, 0x00000007f6400000, 0x00000007f6400000) concurrent-mark-sweep perm gen total 159744K, used 78413K [0x00000007f6400000, 0x0000000800000000, 0x0000000800000000) 2016-02-21T13:53:11.775+0800: 171471.055: [GC2016-02-21T13:53:11.775+0800: 171471.055: [ParNew (promotion failed) Desired survivor size 53673984 bytes, new threshold 6 (max 6) - age 1: 4030872 bytes, 4030872 total - age 2: 5959704 bytes, 9990576 total - age 3: 4628680 bytes, 14619256 total - age 4: 8773080 bytes, 23392336 total - age 5: 7707144 bytes, 31099480 total - age 6: 10890224 bytes, 41989704 total : 914528K->907344K(943744K), 1.0312010 secs]2016-02-21T13:53:12.807+0800: 171472.086: [CMS2016-02-21T13:53:14.455+0800: 171473.735: [CMS-concurrent-sweep: 1.684/2.743 secs] [Times: user=3.69 sys=0.36, real=2.74 secs] (concurrent mode failure): 1451903K->475795K(1560576K), 3.9644230 secs] 2356134K->475795K(2504320K), [CMS Perm : 78413K->78413K(159744K)], 4.9959570 secs] [Times: user=5.65 sys=0.34, real=5.00 secs] Heap after GC invocations=88669 (full 46): par new generation total 943744K, used 0K [0x0000000757000000, 0x0000000797000000, 0x0000000797000000) eden space 838912K, 0% used [0x0000000757000000, 0x0000000757000000, 0x000000078a340000) from space 104832K, 0% used [0x000000078a340000, 0x000000078a340000, 0x00000007909a0000) to space 104832K, 0% used [0x00000007909a0000, 0x00000007909a0000, 0x0000000797000000) concurrent mark-sweep generation total 1560576K, used 475795K [0x0000000797000000, 0x00000007f6400000, 0x00000007f6400000) concurrent-mark-sweep perm gen total 159744K, used 78413K [0x00000007f6400000, 0x0000000800000000, 0x0000000800000000) }
二. 提升失败(promotion failed)
2016-01-07T18:54:26.948+0800: 18782.967: [GC2016-04-07T18:54:26.948+0800: 18782.967: [ParNew (promotion failed) Desired survivor size 117833728 bytes, new threshold 10 (max 10) - age 1: 6141680 bytes, 6141680 total - age 2: 6337936 bytes, 12479616 total - age 3: 549120 bytes, 13028736 total - age 4: 87768 bytes, 13116504 total - age 5: 221384 bytes, 13337888 total - age 6: 934168 bytes, 14272056 total - age 7: 146072 bytes, 14418128 total - age 8: 626064 bytes, 15044192 total - age 9: 398000 bytes, 15442192 total - age 10: 429616 bytes, 15871808 total : 1969227K->1929200K(2071808K), 0.7452140 secs]2016-01-07T18:54:27.693+0800: 18783.713: [CMS: 1394703K->632845K(2097152K), 4.0993640 secs] 3301676K->632845K(4168960K), [CMS Perm : 77485K->77473K(159744K)], 4.8450240 secs] [Times: user=5.18 sys=0.56, real=4.84 secs] Heap after GC invocations=5847 (full 7): par new generation total 2071808K, used 0K [0x00000006e9c00000, 0x0000000776400000, 0x0000000776400000) eden space 1841664K, 0% used [0x00000006e9c00000, 0x00000006e9c00000, 0x000000075a280000) from space 230144K, 0% used [0x0000000768340000, 0x0000000768340000, 0x0000000776400000) to space 230144K, 0% used [0x000000075a280000, 0x000000075a280000, 0x0000000768340000) concurrent mark-sweep generation total 2097152K, used 632845K [0x0000000776400000, 0x00000007f6400000, 0x00000007f6400000) concurrent-mark-sweep perm gen total 159744K, used 77473K [0x00000007f6400000, 0x0000000800000000, 0x0000000800000000) }
三. 在 GC 的时候其他系统活动影响
{Heap before GC invocations=132 (full 0): par new generation total 2696384K, used 2696384K [0xfffffffc20010000, 0xfffffffce0010000, 0xfffffffce0010000) eden space 2247040K, 100% used [0xfffffffc20010000, 0xfffffffca9270000, 0xfffffffca9270000) from space 449344K, 100% used [0xfffffffca9270000, 0xfffffffcc4940000, 0xfffffffcc4940000) to space 449344K, 0% used [0xfffffffcc4940000, 0xfffffffcc4940000, 0xfffffffce0010000) concurrent mark-sweep generation total 9437184K, used 1860619K [0xfffffffce0010000, 0xffffffff20010000, 0xffffffff20010000) concurrent-mark-sweep perm gen total 1310720K, used 511451K [0xffffffff20010000, 0xffffffff70010000, 0xffffffff70010000) 2013-07-17T03:58:06.601-0700: 51522.120: [GC Before GC: : 2696384K->449344K(2696384K), 29.4779282 secs] 4557003K->2326821K(12133568K) ,29.4795222 secs] [Times: user=915.56 sys=6.35, real=29.48 secs]
四. JVM 的 bug
五. 总结
六. 参考资料