我在Hotspot JVM上运行Java 7 update 45上的应用程序.我试图调整参数以适应低延迟应用程序,下面是我为此次运行设置的JVM参数.GC日志中各个步骤的时间(约25ms)不会累计到暂停时间(> 600ms).我怎么知道是什么导致这个暂停时间如此之高？在大多数收藏中,他们加起来很好,并且在暂停时间目标中.我偶尔会看到如此大的停顿,一次在15-20分钟左右(虽然不是那么规律).
-server -Xmx2g -Xms2g -XX:PermSize = 128m -XX:MaxPermSize = 128m -XX:+ UseG1GC -XX:MaxGCPauseMillis = 30 -XX:ParallelGCThreads = 9 -XX:ConcGCThreads = 4 -XX:G1HeapRegionSize = 4M -XX: InitiatingHeapOccupancyPercent = 45 -XX:+ PrintTLAB -XX:+ AggressiveOpts -Xloggc:/integral/logs/gc.log -verbose:gc -XX:+ PrintTenuringDistribution -XX:+ PrintGCDateStamps -XX:+ PrintAdaptiveSizePolicy -XX:+ PrintGCDetails -XX :+ PrintGCApplicationConcurrentTime -XX:+ PrintGCApplicationStoppedTime -XX:+ PrintSafepointStatistics -XX:PrintSafepointStatisticsCount = 1 -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port = 3026 -Dcom.sun.management.jmxremote.local. only = false -Dcom.sun.management.jmxremote.authenticate = false -Dcom.sun.management.jmxremote.ssl = false"
2014-01-28T16:16:12.084+0000: 27507.054: Application time: 8.9506630 seconds
2014-01-28T16:16:12.084+0000: 27507.055: [GC …