Re: [PerfSuite-users] question about profiling more than one block of code

[George M. <ge...@ma...>]

Dear Rick,

Thanks for the answer. At first I should say that I don't want to run the
program many times in order to profile all the code as I believe it's not so
right specially if I use a lot of processors and I have to run it again and
again. Although your code (I am not expert in fortran) seems very nice and
it does whatever I want. I don't care about XML file as I worry only for the
result's accuracy about Mflops. Thanks a lot for the tip as I can understand
it reads the hardware counters so maybe it's ok.

Thanks a lot,
Best regards,
George Markomanolis

On Mon, Jun 15, 2009 at 11:36 PM, Rick Kufrin <rk...@il...> wrote:

> George,
>
> No need to be sorry, your question is reasonable.  Unfortunately, although
> I understand conceptually what you are trying to accomplish, that is:
>
> 1. Bracket multiple portions of your application and collect counter data
> independently for each
> 2. Output separate XML documents for each bracketed portion
> 3. Use psprocess to generate derived metrics for each XML document
>
> ... this mode of operation is not well-supported in PerfSuite.  One could
> arrange to mimic this behavior, but it would be a lot of effort and code
> changes within the application to manage the data.
>
> The simplest way of achieving this with the PS API is to do multiple runs
> of your application, each run collecting the performance data from a
> different region of the application, rather than attempting to collect data
> for multiple regions simultaneously.
>
> It is still possible to get the information you are looking for through the
> PerfSuite API, and I am attaching a small example program written today to
> show the basic idea.  The example has very few comments, but hopefully it is
> not too difficult to understand.  Note that XML is not used at all in this
> way of measurement.
>
> Regarding your second question today (about profiling), it is currently not
> possible through PerfSuite to profile based on more than one hardware event.
>  I should emphasize this is a limitation of PerfSuite, and not the hardware
> capabilities or limitations of PAPI.
>
> Rick
>
> George Markomanolis wrote:
>
>> Dear all,
>>
>> sorry if my question is simple but I didn't find any info about it. I have
>> a fortran code, I have profiled it either with psrun either by PSF_
>> commands. My question is if I can profile two (or more) sections of my code
>> and take as output two values about Mflops for example I would like to see
>> Mflops per function and not total Mflops for all the program. I tried with
>> PSF commands to start profiling, write the file and start again profiling
>> but there was no second file.
>>
>> Thanks a lot,
>> Best regards,
>> George Markomanolis
>>
>>
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