[Darshan-users] Darshan Calibration

[Phil Carns]

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
>
>
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