Hi,
I've briefly looked through perfmon's document. It seems that perfmon
provides both time-based sampling and event-based sampling. In the
event-based sampling mode, a sampling is made when a preset event reaches a
specific threshold. I think this is exactly what I want. That is, collect
the counter values after every million instructions are retired. Also,
perfmon provides two options: --long-smpl-periods and --short-smpl-periods.
I believe these two options are related to the sampling period setting. Can
anyone generally explain how to do a sampling in event-based mode?
Maybe this question is sort of silly, but please, I really have no
idea...
Thanks very much,
Ying
On Wed, Jul 6, 2011 at 4:45 PM, Ying Zhang <yzha...@tigers.lsu.edu> wrote:
> Thanks Corey, I think I'll take a look at the "perf" tool first.
>
>
> On Wed, Jul 6, 2011 at 4:36 PM, Corey Ashford <cjash...@linux.vnet.ibm.com
> > wrote:
>
>> On 07/06/2011 12:45 PM, Ying Zhang wrote:
>> > Thanks for your reply, Pradeep. I am conducting my experiment on an
>> > Intel Xeon E5530 (Nahalem architecture) processor, and the operating
>> > system is Fedora 13 X86_64. Can I use perfmon on this platform?
>>
>> No, because Fedora 13 is based upon the 2.6.33 kernel. The perfmon2
>> patch set only works on 2.6.30 kernels and earlier.
>>
>> You're better off using the newer kernel API called perf_events.
>> There's a user space tool that's available with Fedora 13 and later,
>> called "perf" (do a "yum install perf" and you should get it).
>>
>> If you want to do exactly what you are talking about instead of using
>> either "perf record" (for profiling) or "perf stat" (for counting
>> events), you will need to write the code yourself.
>>
>> To write the code yourself, you could use either the raw kernel API, or
>> use PAPI which should make your job a little easier.
>>
>> PAPI should also be available via yum in Fedora 13, I think (try "yum
>> install papi").
>>
>> You can find the programming details of PAPI here:
>>
>> http://icl.cs.utk.edu/projects/papi/wiki/PAPIC:PAPI.3
>>
>> If you have specific questions about how to use PAPI, PAPI has its own
>> mailing list.
>>
>> - Corey
>>
>>
>> ------------------------------------------------------------------------------
>> All of the data generated in your IT infrastructure is seriously valuable.
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>> http://p.sf.net/sfu/splunk-d2d-c2
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>
>
------------------------------------------------------------------------------
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2d-c2
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