[Darshan-users] Using darshan for non-MPI programs

[Kevin Harms]

Michael,

  Darshan itself needs MPI. It uses some collective calls and file routines when generating the log. The log is written when MPI_Finalize is called. If you're going to modify your POSIX program, then it seems easier to just instrument your main() with MPI_Init() and MPI_Finalize().

  Using:

void __attribute__ ((constructor)) PMPI_Init()

  i think would work to initialize darshan, but you still need to call PMPI_Finalize at some point to get the log.

kevin

On Jun 4, 2013, at 8:37 AM, Michael Kluge <michael.kluge at tu-dresden.de> wrote:

> Dear list,
> 
> if I understand all the documentation well, darshan collects profiles of MPI programs only because it will initialize itself from a wrapper to MPI_Init(). Is this the only case, why pure POSIX programs (maybe multithreaded) would not work together with darshan? 
> 
> Is there any chance that an approach that uses 
> 
> void __attribute__ ((constructor)) my_lib_init()
> (see: http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html)
> 
> from gcc would work as well for pure POSIX programs? 
> 
> 
> Regards, Michael
> 
> --
> Dr.-Ing. Michael Kluge
> 
> Technische Universität Dresden
> Center for Information Services and
> High Performance Computing (ZIH)
> D-01062 Dresden
> Germany
> 
> Contact:
> Willersbau, Room WIL A 208
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> 
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