Java内存Heap运行时间分析.

java -Xrunhprof:help
Hprof usage: -Xrunhprof[:help]|[=, ...]

Option Name and Value Description Default
--------------------- ----------- -------
heap=dump|sites|all heap profiling all
cpu=samples|times|old CPU usage off
monitor=y|n monitor contention n
format=a|b ascii or binary output a
file= write data to file java.hprof(.txt for ascii)
net=: send data over a socket write to file
depth= stack trace depth 4
cutoff= output cutoff point 0.0001
lineno=y|n line number in traces y
thread=y|n thread in traces? n
doe=y|n dump on exit? y