Poor Man's Profiler

rationale Sampling tools like oprofile or dtrace's profile provider don't really provide methods to see what [multithreaded] programs are blocking on - only where they spend CPU time. Though there exist advanced techniques (such as systemtap and dtrace call level probes), it is overkill to build upon that. Poor man doesn't have time. Poor man needs food. method For a poor developer to understand w

[Takao]

poor man's profilerは手軽で便利！Perl XSモジュールのパフォーマンス調査にも使えた。

[fcicq]

sampling by blocking syscall. see also pstack http://blog.yufeng.info/archives/873 . see also flamegraph. gdb -ex "set pagination 0" -ex "thread apply all bt" --batch -p PID

[ita-wasa]

Getting stacks: gdb -ex "set pagination 0" -ex "thread apply all bt" \ --batch -p $(pidof mysqld)