Java performance master

原文链接

Thread.getAllStatckTraces()

有关jvm的safepoint部分

主要是socket部分，关于buffer的读取？

使用AsyncGetCallTrace

AsyncGetCallTrace(ASGCT_CallTrace *trace,
									jint depth,
									void* ucontext)

Perf Event

$ perf record –F 1009 java ...
$ perf report

4.70% java [kernel.kallsyms] [k] clear_page_c
2.10% java libpthread-2.17.so [.] pthread_cond_wait
1.97% java libjvm.so [.] Unsafe_Park
1.40% java libjvm.so [.] Parker::park
1.31% java [kernel.kallsyms] [k] try_to_wake_up
1.31% java perf-18762.map [.] 0x00007f8510e9e757
1.21% java perf-18762.map [.] 0x00007f8510e9e89e
1.17% java perf-18762.map [.] 0x00007f8510e9cc17

Perf + FlameGraph