20 February 2014
Using Linux perf for great CPU stats and seeing system performance
The perf command is a really good low-level Linux profiling tool.
You can use it to profile your programs ...
$ perf stat conv
Performance counter stats for 'conv':
18.600269 task-clock # 0.970 CPUs utilized
13 context-switches # 0.001 M/sec
8 CPU-migrations # 0.000 M/sec
1621 page-faults # 0.087 M/sec
34604515 cycles # 1.860 GHz [35.87%]
3070113 stalled-cycles-frontend # 8.87% frontend cycles idle [28.97%]
2557127 stalled-cycles-backend # 7.39% backend cycles idle
10234506 instructions # 0.30 insns per cycle
# 0.30 stalled cycles per insn [96.18%]
3765521 branches # 202.444 M/sec [75.68%]
159957 branch-misses # 4.25% of all branches [54.80%]
0.019182090 seconds time elapsed
But you can use it to profile the running system and then for example query who caused certain kernel lock events with the interaction "perf top" tool....
https://perf.wiki.kernel.org/index.php/Main_Page
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Developer_Guide/perf-using.html
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