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Thanks Ketan. Could you also share one of the *.darshan.gz output
files from darshan? It will have more information in it about
exactly which files were traced by Darshan than what we can see in
the summary pdf file.<br>
<br>
-Phil<br>
<br>
On 06/01/2011 12:25 PM, ketan wrote:
<blockquote cite="mid:4DE667F5.6070607@mcs.anl.gov" type="cite">
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Phil,<br>
<br>
Following is the output of ldd:<br>
<br>
[login.ci.uchicago.edu:progs]$ ldd modftdock<br>
not a dynamic executable<br>
<br>
Also attached is the strace output. I am not very much used to
interpret strace level calls.<br>
<br>
Ketan<br>
<br>
<br>
On 6/1/11 10:58 AM, Phil Carns wrote:
<blockquote cite="mid:4DE661B3.4050703@mcs.anl.gov" type="cite">
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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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