[MPICH] problems with writing in mpi, slaves processes doesnt write

[Robert Latham]

On Wed, Jan 17, 2007 at 04:38:24PM -0400, Luiz Mendes wrote:
> I have been obtaining low values about bandwith (15MB/s - local and non
> local processes) compared to only local processes situations (350 MB/s). Is
> it normal? Would be SSH as rpc caller the reason for this? The
> previous measures were obtained with execution using 2 processes and
> using mpirun -np 2 iotest.
> 
> The network here is 100mbits ethernet, with local disc at 7200rpm and the
> other with 5400rpm both IDE interface.

15 MBytes/sec is a reasonable value if you have fast ethernet.  You
see much higher values locally because of caching effects, most
likely.

Glad to hear you are making progress.

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B