[Darshan-users] Darshan trace file creation

[Shane Snyder]

Hi Wadud,

I'm assuming this is a Fortran app, right?

If so, I believe this is tied back to a known issue with Intel MPI's 
Fortran bindings. Long story short, these bindings are calling the PMPI 
variants of the MPI function calls directly which bypasses any profiling 
tool that wraps the MPI interface at the C layer (e.g., Darshan). See 
this post for more details: 
https://software.intel.com/en-us/forums/intel-clusters-and-hpc-technology/topic/279445

I haven't personally confirmed this on Intel MPI 5.x versions (the post 
I reference above is regarding a 4.x version of Intel MPI), but I 
believe other users have reported the problem still exists.

It should be possible to work around the issue by modifying Darshan to 
provide an additional interface for intercepting Fortran MPI calls 
natively at the Fortran layer, but we have not undertaken this 
development effort as of yet. Lacking that, I'm not sure what, if any, 
other solutions there are, unfortunately.

Thanks,
--Shane

On 11/28/2016 02:58 PM, Wadud Miah wrote:
>
> Hello,
>
>
> I built Darshan with Intel MPI 5.1.3 and gcc 4.3.4 with the following 
> configure flags:
>
>
> |./configure --prefix=$HOME/darshan-3.1.2-impi --with-mem-align=8 
> --with-jobid-env=NONE --with-log-path-by-env=DARSHAN_LOGPATH|
>
> |
> |
>
> which built fine. I set |DARSHAN_LOGPATH| to |darshan-trace-dir| and I 
> created the directory |darshan-trace-dir|. I then executed my MPI code 
> which does I/O using:
>
>
> |mpirun -n 9 -env LD_PRELOAD 
> /home/pr1ebt00/pr1ebt05/darshan-3.1.2-impi/lib/libdarshan.so 
> ./bt.A.9.mpi_io_full|
>
> |
> |
>
> in the same directory that has the |darshan-trace-dir| directory. 
> However, I do not see any tracefile in the directory 
> |darshan-trace-dir| and no error messages. Any help will be greatly 
> appreciated.
>
>
> Thanks in advance,
>
> Wadud.
>
>
> ---------------------------------------
>
> Dr. Wadud Miah
>
> Computational Scientist
>
> Numerical Algorithms Group
>
> 01865 518035
>
>
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