Messages in this thread | | | Date | Fri, 22 Oct 2010 00:52:45 -0200 | From | Arnaldo Carvalho de Melo <> | Subject | Re: why could cause PerfTop get nothing output ? |
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Em Sat, Oct 09, 2010 at 05:07:42AM -0400, Luming Yu escreveu: > Hi acme, > > I got nothing output as below, wondering if it was due to too few interrupts ?
Try using a higher frequency:
perf top -F 100000
> Is it possbile to get perf top based on samples from other Perf events?
Yes, any event, just specify it like:
perf top -e instructions
- Arnaldo
> [root@localhost clocksource0]# rpm -qa | grep perf > perf-2.6.36-0.35.rc7.git0.fc15.x86_64 > [root@localhost clocksource0]# uname -a > Linux localhost.localdomain 2.6.36-0.35.rc7.git0.fc15.x86_64 #1 SMP > Wed Oct 6 22:02:54 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux > [root@localhost clocksource0]# perf top > > ------------------------------------------------------------------------------- > PerfTop: 0 irqs/sec kernel:-nan% exact: -nan% [1000Hz > cycles], (all, 2 CPUs) > ------------------------------------------------------------------------------- > > samples pcnt DSO > _______ _____
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