[mvapich-discuss] Buffer limitations

[Mike Page]

Hi,

I am trying to get some code to run but am encountering problems using mpi_send/recv to transfer a large amount of data  (just over 40M elements of an MPI_DOUBLE_PRECISON array). The code just hangs when I reach this data transfer.

Am I possibly blowing out buffer limits? How can I be sure?

> [mpage at fe5 source]$ mpiname -a
> MVAPICH2 1.4.0 2010-01-21 ch3:mrail
> 
> Compilation
> CC: pgcc -g -DNDEBUG -O2
> CXX: pgCC  -DNDEBUG -O2
> F77: pgf77  -DNDEBUG
> F90: pgf90  -DNDEBUG
> 
> Configuration
> CC=pgcc CXX=pgCC F77=pgf77 F90=pgf90 --with-rdma=gen2 --prefix=/opt/mvapich2/1.4.1-pgi --enable-romio=yes --with-file-system=lustre+panfs
> 
> [mpage at fe5 source]$ uname -a
> Linux fe5 2.6.18-194.11.4.el5-perfctr #1 SMP Wed Oct 27 18:35:31 GMT 2010 x86_64 x86_64 x86_64 GNU/Linux
> 


Yhanks

Mike Page
National Center for Atmospheric Research
Research Applications Lab (RAL)
Joint Numerical Testbed (JNT)

Ofc: 303-497-2464
Cell: 303-944-8291