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Hi Ketan,<br>
<br>
Since this is a single process, you could capture an strace of an
execution for confirmation. Could you try this:<br>
<br>
strace -v my_executable_and_arguments >& output.txt<br>
<br>
It might point out something that your program is doing that Darshan
isn't capturing for some reason.<br>
<br>
Also, could you share the output of this command to make sure that
we understand if your libraries are all statically linked?<br>
<br>
ldd my_executable<br>
<br>
thanks,<br>
-Phil<br>
<br>
On 06/01/2011 10:35 AM, ketan wrote:
<blockquote cite="mid:4DE64E27.3000500@mcs.anl.gov" type="cite">Hello,
<br>
<br>
Per my previous mails, I have been now successfully able to use
Darshan for our programs. However, it seems that Darshan reports
are not reflecting the amount of data produced by our program.
<br>
<br>
More specifically, our program produces about 136K of data while
Darshan plots seem to be reporting only about 1K. To combat this
and to callibrate Darshan, we thought of profiling the UNIX
coreutils dd program with Darshan.
<br>
<br>
However, while trying to do this, when I insert the MPI_Init() and
MPI_Finalize() in dd source, I get linker errors on compilation.
<br>
<br>
So, my questions are:
<br>
<br>
1. Is there a definitive way of finding how Darshan intercepts the
program?
<br>
2. Can I cross verify with some other tool what Darshan has
produced is indeed consistent?
<br>
3. Are there any calibration parameters that I can set while using
Darshan?
<br>
4. Has someone tried using Darshan with coreutils programs?
<br>
<br>
Attaching two Darshan reports corresponding to our findings.
<br>
<br>
<br>
Best Regards,
<br>
Ketan
<br>
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