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Subject: [OMPI users] Dynamic algorithms problem
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2010-07-04 08:12:42


Dear OpenMPI user,

i'm trying to use collective dynamic rules with OpenMPi 1.4.2:

export OMPI_MCA_coll_tuned_use_dynamic_rules=1
export OMPI_MCA_coll_tuned_bcast_algorithm=1

My target is to test Bcast peformances using SKaMPI benchmark changing
dynamic rules. But at runtime i get the follow error:

[node003:05871] *** Process received signal ***
[node003:05871] Signal: Segmentation fault (11)
[node003:05871] Signal code: Address not mapped (1)
[node003:05871] Failing at address: 0xcc
[node003:05872] *** Process received signal ***
[node003:05872] Signal: Segmentation fault (11)
[node003:05872] Signal code: Address not mapped (1)
[node003:05872] Failing at address: 0xcc
[node003:05871] [ 0] /lib64/libpthread.so.0 [0x3be160e4c0]
[node003:05871] [ 1]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2accf7210145]
[node003:05871] [ 2]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2accf720ef16]
[node003:05871] [ 3]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2accf721fec9]
[node003:05871] [ 4]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0(MPI_Bcast+0x171)
[0x2accf71b81e1]
[node003:05871] [ 5] ./skampi [0x409566]
[node003:05871] [ 6] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3be0e1d974]
[node003:05871] [ 7] ./skampi [0x404e19]
[node003:05871] *** End of error message ***
[node003:05872] [ 0] /lib64/libpthread.so.0 [0x3be160e4c0]
[node003:05872] [ 1]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2b1959eb3145]
[node003:05872] [ 2]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2b1959eb1f16]
[node003:05872] [ 3]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0
[0x2b1959ec2ec9]
[node003:05872] [ 4]
/gpfs/scratch/userinternal/cin0243a/openmpi-1.4.2/openmpi-1.4.2-install/lib/libmpi.so.0(MPI_Bcast+0x171)
[0x2b1959e5b1e1]
[node003:05872] [ 5] ./skampi [0x409566]
[node003:05872] [ 6] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3be0e1d974]
[node003:05872] [ 7] ./skampi [0x404e19]
[node003:05872] *** End of error message ***
--------------------------------------------------------------------------
mpirun noticed that process rank 9 with PID 5872 on node node003ib0 exited
on signal 11 (Segmentation fault).
--------------------------------------------------------------------------

The same using other Bcast algorithm. Disabling dynamic rules, it works
well. Maybe i'm using some wrong parameter setup?

Thanks in advance.

-- 
Ing. Gabriele Fatigati
Parallel programmer
CINECA Systems & Tecnologies Department
Supercomputing Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it