我正在使用CMS进行GC,但每两个月后CPU的使用率会非常高。调整GC(CMS)的参数
有一张GC日志,当情况变得更糟时,您可能会发现很长的STW。
3519696.386: [GC [1 CMS-initial-mark: 8617524K(12582912K)] 17105967K(23907584K), 4.9369140 secs] [Times: user=4.94 sys=0.00, real=4.94 secs]
3519701.324: [CMS-concurrent-mark-start]
3519709.419: [CMS-concurrent-mark: 8.096/8.096 secs] [Times: user=16.17 sys=0.00, real=8.09 secs]
3519709.420: [CMS-concurrent-preclean-start]
3519709.442: [CMS-concurrent-preclean: 0.023/0.023 secs] [Times: user=0.02 sys=0.00, real=0.02 secs]
3519709.442: [CMS-concurrent-abortable-preclean-start]
CMS: abort preclean due to time 3519714.691: [CMS-concurrent-abortable-preclean: 3.345/5.248 secs] [Times: user=3.36 sys=0.00, real=5.25 secs]
3519714.692: [GC[YG occupancy: 8489655 K (11324672 K)]3519714.692: [Rescan (parallel) , 8.4072250 secs]3519723.099: [weak refs processing, 0.0000190 secs]3519723.099: [scrub string table, 0.0008130 secs] [1 CMS-remark: 8617524K(12582912K)] 17107180K(23907584K), 8.4081940 secs] [Times: user=65.71 sys=0.15, real=8.41 secs]
3519723.100: [CMS-concurrent-sweep-start]
3519725.451: [CMS-concurrent-sweep: 2.350/2.350 secs] [Times: user=2.36 sys=0.00, real=2.35 secs]
3519725.451: [CMS-concurrent-reset-start]
3519725.478: [CMS-concurrent-reset: 0.028/0.028 secs] [Times: user=0.03 sys=0.00, real=0.03 secs]
3519727.480: [GC [1 CMS-initial-mark: 8617522K(12582912K)] 17107229K(23907584K), 4.9378950 secs] [Times: user=4.94 sys=0.00, real=4.94 secs]
3519732.418: [CMS-concurrent-mark-start]
我的GC参数:
java -server -Xmx24g -Xms24g -XX:NewSize=12g -XX:MaxNewSize=12g -XX:+HeapDumpOnOutOfMemoryError -XX:MaxDirectMemorySize=24g -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:ReservedCodeCacheSize=128m -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:CMSInitiatingOccupancyFraction=68
有9个CPU和我的服务器上安装64G内存。
你能帮忙弄清楚为什么每月变得更糟的关键点?
你是否附加了视觉,看看是否有泄漏或最终确定的问题? –
@ThorbjørnRavnAndersen有什么工具可以做到吗? – Junjie
Visualvm是jdk发行版的一部分。 –