* Regarding the basic use of perf top command
@ 2011-07-13 14:59 ankur dwivedi
2011-07-13 15:40 ` Vipin
0 siblings, 1 reply; 3+ messages in thread
From: ankur dwivedi @ 2011-07-13 14:59 UTC (permalink / raw)
To: kernelnewbies
Hi,
My question is regarding the basic use of perf top command in linux.
The following is the snap shot of running a "*perf top -e cache-misses*"
command from console:
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
PerfTop: 76* irqs/sec* kernel:14.5% exact: 0.0% [1000Hz
cache-misses], (all, 12 CPUs)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
*samples* *pcnt* function DSO
_______ _____ _______________________
____________________________________
48.00 36.9% get_page_from_freelist
[kernel.kallsyms]
12.00 9.2% JS_CallTracer
/usr/lib/xulrunner-1.9.2/libmozjs.so
12.00 9.2% JS_TraceChildren
/usr/lib/xulrunner-1.9.2/libmozjs.so
8.00 6.2% dso__find_symbol
/usr/bin/perf
7.00 5.4% native_flush_tlb_single
[kernel.kallsyms]
6.00 4.6% _int_malloc
/lib/libc-2.12.90.so
What i want to know is the significance of different parameters here which
are the following:
1. irqs/sec
2. samples
3. pcnt
It also shows a value of 1000Hz. what is the meaning of that.
I searched regarding these in the internet, but was unable to find a good
explanation
Thanks
Ankur
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^ permalink raw reply [flat|nested] 3+ messages in thread* Regarding the basic use of perf top command
2011-07-13 14:59 Regarding the basic use of perf top command ankur dwivedi
@ 2011-07-13 15:40 ` Vipin
2011-07-14 7:02 ` ankur dwivedi
0 siblings, 1 reply; 3+ messages in thread
From: Vipin @ 2011-07-13 15:40 UTC (permalink / raw)
To: kernelnewbies
Hi,
I think this should suffice
https://perf.wiki.kernel.org/index.php/Tutorial#Live_analysis_with_perf_top
Rest of the information is archived here
http://lxr.linux.no/linux+v2.6.39/tools/perf/Documentation/
The value of 1000Hz means the frequency at which the system's timer is
programmed to interrupt the kernel. It is a kernel configurable option.
Thanks
Vipin
On 07/13/2011 10:59 AM, ankur dwivedi wrote:
> Hi,
>
> My question is regarding the basic use of perf top command in linux.
>
> The following is the snap shot of running a "*perf top -e
> cache-misses*" command from console:
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> PerfTop: 76*irqs/sec* kernel:14.5% exact: 0.0% [1000Hz
> cache-misses], (all, 12 CPUs)
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> *samples* *pcnt* function DSO
> _______ _____ _______________________
> ____________________________________
>
> 48.00 36.9% get_page_from_freelist [kernel.kallsyms]
> 12.00 9.2% JS_CallTracer
> /usr/lib/xulrunner-1.9.2/libmozjs.so
> 12.00 9.2% JS_TraceChildren
> /usr/lib/xulrunner-1.9.2/libmozjs.so
> 8.00 6.2% dso__find_symbol /usr/bin/perf
> 7.00 5.4% native_flush_tlb_single [kernel.kallsyms]
> 6.00 4.6% _int_malloc
> /lib/libc-2.12.90.so <http://libc-2.12.90.so>
>
>
> What i want to know is the significance of different parameters here
> which are the following:
> 1. irqs/sec
> 2. samples
> 3. pcnt
>
> It also shows a value of 1000Hz. what is the meaning of that.
>
> I searched regarding these in the internet, but was unable to find a
> good explanation
>
> Thanks
> Ankur
>
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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* Regarding the basic use of perf top command
2011-07-13 15:40 ` Vipin
@ 2011-07-14 7:02 ` ankur dwivedi
0 siblings, 0 replies; 3+ messages in thread
From: ankur dwivedi @ 2011-07-14 7:02 UTC (permalink / raw)
To: kernelnewbies
Hi,
The links provided gives description about the perf tool. As i mentioned
before, i was interested in the significance of the following:
1. irqs/sec
2. samples
3. pcnt
A brief explanation will suffice, as i am also looking into the code of perf
top.
Thanks
Ankur
On Wed, Jul 13, 2011 at 9:10 PM, Vipin <vj358@nyu.edu> wrote:
> **
> Hi,
>
> I think this should suffice
> https://perf.wiki.kernel.org/index.php/Tutorial#Live_analysis_with_perf_top
>
> Rest of the information is archived here
> http://lxr.linux.no/linux+v2.6.39/tools/perf/Documentation/
>
> The value of 1000Hz means the frequency at which the system's timer is
> programmed to interrupt the kernel. It is a kernel configurable option.
>
> Thanks
> Vipin
>
> On 07/13/2011 10:59 AM, ankur dwivedi wrote:
>
> Hi,
>
> My question is regarding the basic use of perf top command in linux.
>
> The following is the snap shot of running a "*perf top -e cache-misses*"
> command from console:
>
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> PerfTop: 76* irqs/sec* kernel:14.5% exact: 0.0% [1000Hz
> cache-misses], (all, 12 CPUs)
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> *samples* *pcnt* function DSO
> _______ _____ _______________________
> ____________________________________
>
> 48.00 36.9% get_page_from_freelist
> [kernel.kallsyms]
> 12.00 9.2% JS_CallTracer
> /usr/lib/xulrunner-1.9.2/libmozjs.so
> 12.00 9.2% JS_TraceChildren
> /usr/lib/xulrunner-1.9.2/libmozjs.so
> 8.00 6.2% dso__find_symbol
> /usr/bin/perf
> 7.00 5.4% native_flush_tlb_single
> [kernel.kallsyms]
> 6.00 4.6% _int_malloc /lib/libc-2.12.90.so
>
>
>
> What i want to know is the significance of different parameters here which
> are the following:
> 1. irqs/sec
> 2. samples
> 3. pcnt
>
> It also shows a value of 1000Hz. what is the meaning of that.
>
> I searched regarding these in the internet, but was unable to find a good
> explanation
>
> Thanks
> Ankur
>
>
>
> _______________________________________________
> Kernelnewbies mailing listKernelnewbies at kernelnewbies.orghttp://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
>
--
Thanks
Ankur Dwivedi
Cavium Networks Inc
Office Number - +1 650 623 3643
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2011-07-13 14:59 Regarding the basic use of perf top command ankur dwivedi
2011-07-13 15:40 ` Vipin
2011-07-14 7:02 ` ankur dwivedi
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