[Darshan-users] Darshan Calibration

[ketan]

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
>
>
> _______________________________________________
> Darshan-users mailing list
> Darshan-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/darshan-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/darshan-users/attachments/20110601/caa13e5d/attachment-0001.htm>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: strace_out.txt
URL: <http://lists.mcs.anl.gov/pipermail/darshan-users/attachments/20110601/caa13e5d/attachment-0001.txt>