From: vj358@nyu.edu (Vipin)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Regarding the basic use of perf top command
Date: Wed, 13 Jul 2011 11:40:03 -0400 [thread overview]
Message-ID: <4E1DBC53.40901@nyu.edu> (raw)
In-Reply-To: <CABW4kEdMKooSpG3uEXyS5n-eJu3LfniBXiPVpxzkpAm728czTA@mail.gmail.com>
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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next prev parent reply other threads:[~2011-07-13 15:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-13 14:59 Regarding the basic use of perf top command ankur dwivedi
2011-07-13 15:40 ` Vipin [this message]
2011-07-14 7:02 ` ankur dwivedi
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