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

[Rick K. <rk...@il...>]

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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