[Beowulf] Block send mpi

Joe Landman landman at scalableinformatics.com
Mon Feb 14 00:42:21 EST 2005


Rene:

   More data.  Where exactly does it SEGV?  At the void *buf line? at 
the Pack? or the Bsend?  Did you compile with -g?   Do you have a core dump?

Joe

rene wrote:
> Hi folks,
> 
> i know, this isn't a mpi forum, even so allow me a question about block 
> sending.
> 
> i got some(times) nice SIGSEGVs with that code (C++ implementation).
> Did I code something totally wrong?
> I really don't understand this function.
> // int MPI_Buffer_attach( void *buffer, int size )
> 
>  int packsize;
>  MPI_Pack_size (bit, MPI_INT, newcomm, &packsize);
>  int bufsize = packsize + (MPI_BSEND_OVERHEAD);
>  void *buf = new (void (*[packsize]) ());
>  MPI_Buffer_attach (buf, bufsize);
>  ierr =MPI_Bsend (&testdata[0], bit, MPI_INT, node, 0,  newcomm);
>  MPI_Buffer_detach (&buf, &bufsize);
> 
> Thanks,

-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
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