Re: [FLASH-USERS] Troubles with message size

Hi Garrelt,

On wtorek 05 kwiecień 2005 10:39, Garrelt Mellema wrote:
> This is an error message from the MPI library, not in Flash.

Yes, I know it, but maybe someone knows a way to produce smaller messages?

> You may try to set the environment variable P4_GLOBMEMSIZE to
> something higher, like
> setenv P4_GLOBMEMSIZE 1536870912
> although I found there is some sort of system limit involved too

I tried it. Probably I've reached system limits for that cluster. With root
priviledges one can play with sysctl and /proc/sys/kernel/shmmax, but going
into values of order of total amount of RAM available doesn't seem to be a
good idea.

Maybe there is some way to tell MPICH library to communicate using smaller
chunks of data? Or maybe some other MPI implementation handles this issue in
better way? I've never get deep into MPI and I have no idea what is possible
and what isn't.

-- 
Cheers,
        Artur