On Apr 4, 2007, at 10:36 AM, Durga Choudhury wrote:
Even simpler, you could just write a macro wrapper around MPI_Send
(as opposed to C code). However, if your calls are happening inside
a precompiled library (and you don't have source code for it or
don't want to recompile it) then this won't work and you'd want a
real profiler. However, I don't think you should be tracking PMPI_*
calls anyway; those are implementatiopn details and not user
exposed APIs. Am I right, Jeff?
PMPI_Foo is what you are supposed to call inside the profiled MPI_Foo
function.
The intent of the PMPI interface is that it always exists and will
represent the "real"/back-end functionality. So you can provide your
own MPI_Foo function that turns around and calls the "real" PMPI_Foo
function.
Durga
On 4/4/07, Jeff Squyres <jsquy...@cisco.com> wrote: On Apr 4, 2007,
at 11:12 AM, po...@cc.gatech.edu wrote:
> I want to see how profiling is done .I need to track open mpi _send
> command.
> And so need to see how profiling is done.I dont know how to use
> PMPI_SEND.
> Can anybody help me???
Generally, you just write an MPI_Send function yourself, like this:
my_send.c:
include "mpi.h"
int MPI_Send(void *buf, int count, MPI_Datatype type, int dest,
int tag, MPI_Comm comm) {
int ret;
/* ...gather whatever statistics you want ... */
ret = PMPI_Send(buf, count, type, dest, tag, comm);
/* ...gather whatever statistics you want ... */
return ret;
}
Then compile my_send.c into your application (either as a standalone
library or as part of the application itself). It'll naturally
intercept all calls to MPI_Send (as long as it is the rightmost
linker unit before -lmpi on the command line -- so, when using the
wrapper compilers, the last linker unit on the right, since "-lmpi"
is added automatically by the wrapper compilers), do your stats
gathering, invoke the back-end PMPI function, etc.
See chapter 8 of the MPI-1 standard for more information:
http://www.mpi-forum.org/docs/mpi-11-html/node152.html#Node152
--
Jeff Squyres
Cisco Systems
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