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

[Michael Kluge]

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 18:49, 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> 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
>> 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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>