* why could cause PerfTop get nothing output ?
@ 2010-10-09 9:07 Luming Yu
2010-10-22 2:52 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 3+ messages in thread
From: Luming Yu @ 2010-10-09 9:07 UTC (permalink / raw)
To: acme; +Cc: LKML
Hi acme,
I got nothing output as below, wondering if it was due to too few interrupts ?
Is it possbile to get perf top based on samples from other Perf events?
[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
_______ _____
Thanks,
Luming
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: why could cause PerfTop get nothing output ?
2010-10-09 9:07 why could cause PerfTop get nothing output ? Luming Yu
@ 2010-10-22 2:52 ` Arnaldo Carvalho de Melo
2010-10-22 5:58 ` Luming Yu
0 siblings, 1 reply; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2010-10-22 2:52 UTC (permalink / raw)
To: Luming Yu; +Cc: LKML
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
> _______ _____
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: why could cause PerfTop get nothing output ?
2010-10-22 2:52 ` Arnaldo Carvalho de Melo
@ 2010-10-22 5:58 ` Luming Yu
0 siblings, 0 replies; 3+ messages in thread
From: Luming Yu @ 2010-10-22 5:58 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo; +Cc: LKML
On Thu, Oct 21, 2010 at 10:52 PM, Arnaldo Carvalho de Melo
<acme@ghostprotocols.net> wrote:
> 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:
Thanks for the hint.
>
> perf top -F 100000
still nothing..
-------------------------------------------------------------------------------
PerfTop: 0 irqs/sec kernel:-nan% exact: -nan% [100000Hz
cycles], (all, 2 CPUs)
-------------------------------------------------------------------------------
samples pcnt DSO
_______ _____
>> 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
still nothing...
# perf top -e instructions
-------------------------------------------------------------------------------
PerfTop: 0 irqs/sec kernel:-nan% exact: -nan% [1000Hz
instructions], (all, 2 CPUs)
-------------------------------------------------------------------------------
samples pcnt DSO
_______ _____
>
> - 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
>> _______ _____
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2010-10-09 9:07 why could cause PerfTop get nothing output ? Luming Yu
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