Re: [perfmon2] updating perf tool

[Arnaldo Carvalho de Melo <acme@ghostprotocols.net>]

Em Fri, Feb 11, 2011 at 12:31:11PM -0800, Arun Sharma escreveu:
> On Fri, Feb 11, 2011 at 12:21 PM, Can Hankendi <hankendi@gmail.com> wrote:
> > Thanks for the reply.  I've tried perf record -C 0 -e cycles sleep 1 but i
> > received an error: Couldn't record kernel reference relocation symbol. Is it
> > possible to create per core report by using perf stat -C 0,1 so that I can
> > have individual stats for each core?
> 
> # ./perf stat -e cycles -A -a -- sleep 1
> 
>  Performance counter stats for 'sleep 1':
> 
> CPU0         2,145,862,116 cycles
> CPU1         2,146,131,064 cycles
> CPU2         2,146,021,047 cycles
> [...]
> 
> and you can grep out only the CPUs you're looking for.
> 
> If you're looking to do something more complicated that really
> requires hacking up a script, I wrapped the perf_event_open syscall in
> python via swig.
> 
> sys.py --cpulist
> 
> may be interesting.
> 
> http://perfmon2.git.sourceforge.net/git/gitweb.cgi?p=perfmon2/libpfm4;a=blob;f=python/sys.py;h=e3a44f24174b979694e2588592f759010b77621e;hb=f70e032b5b69cf5aa6f7e0da746b1817c64341e9

Interesting, have you seen the python binding in tip/perf/core?

- Arnaldo