"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007f20c80b3800 nid=0x57c0 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE
CPU使用率持续高水位(相比于调整前)。确实没了C2 thread 的问题,但是猜测由于代码编译的不够C2那么优秀,所以代码持续性能低下。 CPU截图: 5.2 增加C2 线程数 增加参数 :-XX:CICompilerCount=8 恢复参数:-XX:+TieredCompilation 效果一般,仍然有请求超时。但是会少一些。 CPU截图: 5.3 推论 其实从上面的分析可以...
定位到 C2 CompilerThread0这个线程占用了比较高的CPU。C2 Compiler 是JVM在server模式下字节码编译器,JVM启动的时候所有代码都处于解释执行模式,当某些代码被执行到一定阈值次数,这些代码(称为热点代码)就会被 C2 Compiler编译成机器码,编译成机器码后执行效率会得到大幅提升。 流量进来后,大部分代码成为热点代码,这个...
当解释器发现热点方法时会调用 CompilerBroker::comple_method()向编译任务队列投递一个编译任务(CompileTask),然后C2编译器线程会在发现任务队列有编译任务时唤醒,拉取编译任务并进入JIT编译器。目光转向C2编译线程(C2 CompilerThread),它最开始阻塞在编译任务队列,在发现编译任务后唤醒,接着经过如代码清单9-1所示的调...
of operation, the application crashes on the same thread. Initially, the problem was with Java 11.0.12, then we decided to upgrade to 11.0.16 (we did not update to the latest one, because it does not support some types of encryption). Supposedly the problem is in C2 CompilerThread0. ...
jstack: Java占用高CPU分析之- C2 Compiler Thread https://blog.csdn.net/chenxiusheng/article/details/74007750 规格严格-功夫到家 粉丝-152关注 -971 +加关注
--- T H R E A D --- Current thread (0x0000015ab9877000): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=22420, stack(0x000000286bf00000,0x000000286c000000)] Current CompileTask: C2:9699782 41389 4 javax.swing.plaf.basic.BasicSplitPaneUI$BasicHorizontalLayoutManager::...
2、重新启动后,我们观察到了C1 ComplierThread和C2 ComplierThread线程。而时机也与性能监控的抖动时间刚好吻合,故可以确定是由于应用重启,大量的代码被识别为热点代码,触发了JIT complier的编译行为从而带来了CPU利用率的飙高。 C1(Client Compiler)是一个简单快速的编译器,...
Java crash in C2 compiler thread: Raw # # A fatal error has been detected by the Java Runtime Environment: # # Internal Error (loopnode.hpp:628), pid=4252, tid=0x00007f4d78ee6700 # guarantee(n != NULL) failed: No Node. # # JRE version: OpenJDK Runtime Environment (8.0_322-b06...
java.lang.Thread.State: RUNNABLE "C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fa7c01a2800 nid=0x13bf waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fa7c0193000 nid=0x13be waiting on...