Re: [mpich-discuss] MPI_init very slow with more than 3 nodes: Solved (in part)
Excellent. Thanks for letting us know. — Pavan On Dec 5, 2013, at 9:24 AM, Bixente BODO GOMEZ <[email protected]> wrote:
Hi!
The problem is nfs, I don't know by server or clients. I have installed mpich in all nodes locally and now the system runs well:
mpiu@u105251:~$ date; mpirun -f machinefile -np 28 test/hello; date jue dic 5 16:08:54 CET 2013 ... Hola desde el procesador u103972. 4 de 28 ... jue dic 5 16:08:57 CET 2013
And
mpiu@u105251:~$ date; mpirun -f machinefile -np 8 test/cilindro; date jue dic 5 16:17:17 CET 2013
Calculo de superficie y volumen de un cilindro de radio r y altura h Numero de procesadores: 8
Introduce el radio r: 1 la altura h: 22 delta: 1e-8
Calculando.....
Valor conocido del volumen : 69.1150383770 Valor calculado : 69.1150349775 Valor conocido del area : 138.2300767540 Valor calculado : 138.2300699549
Tiempo empleado (sec) : 0.95427608
jue dic 5 16:17:26 CET 2013
mpiu@u105251:~$ date; mpirun -f machinefile -np 28 test/cilindro; date jue dic 5 16:17:46 CET 2013
Calculo de superficie y volumen de un cilindro de radio r y altura h Numero de procesadores: 28
Introduce el radio r: 1 la altura h: 22 delta: 1e-8
Calculando.....
Valor conocido del volumen : 69.1150383770 Valor calculado : 69.1150348402 Valor conocido del area : 138.2300767540 Valor calculado : 138.2300696804
Tiempo empleado (sec) : 0.30431104
jue dic 5 16:17:55 CET 2013
Thanks.
Pavan Balaji <[email protected]> escribió:
One thing you could try is to install mpich on a non-NFS directory such as /tmp and run a program that is also not on NFS to see if the problem persists.
You can build mpich on an NFS directory with --prefix=/tmp/mpich and then do “make install” on each machine.
Similarly for the “application”, you can run “/bin/hostname” or something similar.
— Pavan
On Dec 3, 2013, at 12:06 PM, Antonio J. Peña <[email protected]> wrote:
Yes, it may be a good idea to look into that. Hopefully somebody in this list with NFS knowledge will give you a hint.
Antonio
On 12/03/2013 09:48 AM, Bixente BODO GOMEZ wrote:
I send a extract of tcpdump. It seems that the problem is in the file attribues o locks of nfs. I changed fstab on clients to add these options:
nfsvers=3,rw,bg,noac,rsize=8192,wsize=8192
but nothing has improved.
"Antonio J. Peña" <[email protected]> escribió:
I don't think this is helping. Maybe tcpdump / wireshark captures could be helpful.
Antonio
On 12/02/2013 11:44 AM, Bixente BODO GOMEZ wrote:
The attachment...
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-- Antonio J. Peña Postdoctoral Appointee Mathematics and Computer Science Division Argonne National Laboratory 9700 South Cass Avenue, Bldg. 240, Of. 3148 Argonne, IL 60439-4847 (+1) 630-252-7928 [email protected] www.mcs.anl.gov/~apenya
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To manage subscription options or unsubscribe:
-- Antonio J. Peña Postdoctoral Appointee Mathematics and Computer Science Division Argonne National Laboratory 9700 South Cass Avenue, Bldg. 240, Of. 3148 Argonne, IL 60439-4847
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