[mpich-discuss] MPE tracing

[chan at mcs.anl.gov]

The equivalent of customized logging for tracing is to add a 
printf("Starting of block A...") before the selected block of codes
and do another printf("Ending of block A...") after the block of codes.
But that still produces a lot of output.  I think what should be done
is to have MPI_Pcontrol() implemented in the tracing library, so that
one can turn on or off tracing with MPI_Pcontrol.  I think the feature
can be easily added to the trace_mpi_core.c ...  But it is not there yet.

Given the tracing library does not have MPI_Pcontrol support and you may
want to use logging library with MPI_Pcontrol instead.  BTW, are the
MPI programs being profiled uses communicator besides MPI_COMM_WORLD ?
If the answer is yes, your version of logging library may contain
bugs in MPI_Pcontrol when used with MPI communicator functions.  Let
me know, I will give you a patch...

A.Chan

----- "Georges Markomanolis" <george at markomanolis.com> wrote:

> Thank you all for your answers,
> 
> I used clog2print because I wanted to see only the traces, not the 
> visualization as I need to convert the MPE traces into another format
> 
> that I need. Moreover I changed the output of the tracing library in 
> order to have the format that I mentioned and it seems to work very 
> nice. One more question. Is it possible to have a selective 
> instrumentation with the tracing library? I think something similar
> with 
> the customized logging but for tracing, I just need to know which MPI
> 
> calls are executed by a block of code.
> 
> Thanks a lot,
> Best regards,
> Georges
> 
> chan at mcs.anl.gov wrote:
> > ----- "Georges Markomanolis" <georges.markomanolis at ens-lyon.fr>
> wrote:
> >
> >   
> >> Dear all,
> >>
> >> I want to ask you about the MPE's libraries. While I use the
> logging 
> >> library for an application, I dump the clog file with the command 
> >> clog2print (is the right way to see the content of the files?).
> >>     
> >
> > No, you should use the command jumpshot to "view" clog2 file.
> >
> >   
> >> Although 
> >> my application executes MPI_Bcast commands I can't see them. From
> the
> >> manual I read that nested calls are not taken into account, like 
> >> MPI_Bcast. Is this why I can't see any MPI_Bcast? 
> >>     
> >
> > No. nested call probably is irrelevant here.
> >
> >   
> >> Moreover when I link 
> >> with the tracing library I can see the MPI_Bcast commands. So in
> the 
> >> case that I want to know about all the MPI commands I should use
> >> tracing 
> >> not logging? I don't need the timestamps and the visualization.
> >>     
> >
> > If you have access to the source code and you don't care about the
> order
> > of MPI calls being executed, you can simply use "grep" of string
> that
> > is prefixed with MPI_, e.g.
> >
> > grep "MPI_[A-Za-z_]*(" *.c
> >
> > If you still need to do logging, you can send me how you
> linked/compiled
> > to enable MPE logging (I suspect something wrong there).
> >
> > A.Chan
> >   
> >> Thanks a lot,
> >> Best regards,
> >> Georges
> >> _______________________________________________
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> >>     
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