[Darshan-users] Darshan Calibration

[Phil Carns]

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.

-Phil

On 06/01/2011 12:25 PM, ketan wrote:
> Phil,
>
> Following is the output of ldd:
>
> [login.ci.uchicago.edu:progs]$ ldd modftdock
>     not a dynamic executable
>
> Also attached is the strace output. I am not very much used to 
> interpret strace level calls.
>
> Ketan
>
>
> On 6/1/11 10:58 AM, Phil Carns wrote:
>> Hi Ketan,
>>
>> Since this is a single process, you could capture an strace of an 
>> execution for confirmation.  Could you try this:
>>
>> strace -v my_executable_and_arguments >& output.txt
>>
>> It might point out something that your program is doing that Darshan 
>> isn't capturing for some reason.
>>
>> Also, could you share the output of this command to make sure that we 
>> understand if your libraries are all statically linked?
>>
>> ldd my_executable
>>
>> thanks,
>> -Phil
>>
>> On 06/01/2011 10:35 AM, ketan wrote:
>>> Hello,
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> However, while trying to do this, when I insert the MPI_Init() and 
>>> MPI_Finalize() in dd source, I get linker errors on compilation.
>>>
>>> So, my questions are:
>>>
>>> 1. Is there a definitive way of finding how Darshan intercepts the 
>>> program?
>>> 2. Can I cross verify with some other tool what Darshan has produced 
>>> is indeed consistent?
>>> 3. Are there any calibration parameters that I can set while using 
>>> Darshan?
>>> 4. Has someone tried using Darshan with coreutils programs?
>>>
>>> Attaching two Darshan reports corresponding to our findings.
>>>
>>>
>>> Best Regards,
>>> Ketan
>>>
>>>
>>> _______________________________________________
>>> Darshan-users mailing list
>>> Darshan-users at lists.mcs.anl.gov
>>> https://lists.mcs.anl.gov/mailman/listinfo/darshan-users
>>
>>
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>
>
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