[SCore-users-jp] [SCore-users] sleep or signal problems

[Bogdan Costescu]

Hi,

I'm trying to run the following simple C program on SCore 4.2.1:

#include <stdio.h>
#include <unistd.h>
#include <mpi.h>

int main(int argc, char *argv[])
{
int r;

r = MPI_Init(&argc, &argv);
printf("Sleeping...\n");
r = sleep(10);
printf("Finalizing. Sleep left: %d\n", r);
MPI_Finalize();
return 1;
}

I expect that after the processes are started on nodes, they all sleep for 
10 seconds then they finish. On SCore this doesn't happen, the 'sleep' 
call doesn't pause execution, instead returns 10 (or whatever number of 
seconds I ask for). The man page for sleep(3) suggests that this situation 
should occur when a signal which is not ignored arrives.
The same program functions as expected when using MPICH 1.2.2 over TCP.

Could someone shed some light on this ? Have I missed the description of 
signals used by SCore MPI (as requested by the MPI Forum) ?

On a larger scale, when I discovered this I was trying to make Global 
Arrays work on SCore. I think that this (sleep and/or signal problems) are 
affecting starting up of ARMCI (trying to use ARMCI over MPI, not ARMCI 
over TCGMSG over MPI). Has anyone got Global Arrays to work on SCore ? 
I've seen the messages exchanged on this list in June, but the last one

http://www.pccluster.org/pipermail/score-users/2002-June/000076.html

left things halfway through...

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu ＠ IWR.Uni-Heidelberg.De

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