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

[Michael Kluge]

Hi Julian,

the problem is that I'm looking for a tool that works with all dynamic 
binaries, even those, where I don't have the source and that are not 
using MPI. There is no hope with darshan for this type of binaries?


Regards, Michael

On 05.06.2013 00:24, Julian Kunkel wrote:
> Hi
> With ld's wrap option I think you can provide a main() replacement which
> calls (p)mpi_init() then the real main and (p)mpi_finalize() afterwards.
>
> This way you only have to recompile POSIX apps wrapping against you
> "darshaning" main method.
>
> Regards
> Julian
>
> -- send with android. Sorry for typos.
>
> Am 04.06.2013 19:03 schrieb "Michael Kluge" <michael.kluge at tu-dresden.de
> <mailto:michael.kluge at tu-dresden.de>>:
>
>     Hi Kevin,
>
>     if I really want to use darshan for POSIX programs on single hosts,
>     then it should be fairly easy to emulate the semantics of the MPI
>     calls through a couple of pthread calls. It might even be possible
>     to replace the few MPI funktions used in darshan with a generic
>     abstraction layer and create an MPI and POSIX-only implementation of
>     that layer. Just thinking ...
>
>
>     Regards, Michael
>
>     Am 04.06.2013 18 <tel:04.06.2013%2018>:49, schrieb 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
>         <mailto: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
>             <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
>             Phone: (+49) 351 463-34217 <tel:%28%2B49%29%20351%20463-34217>
>             Fax: (+49) 351 463-37773 <tel:%28%2B49%29%20351%20463-37773>
>             e-mail: michael.kluge at tu-dresden.de
>             <mailto:michael.kluge at tu-dresden.de>
>             WWW: http://www.tu-dresden.de/zih
>
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-- 
Dr.-Ing. Michael Kluge

Technische Universität Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden
Germany

Contact:
Willersbau, Room A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

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