[mpich-discuss] IMB 3.1 with TOL 0 crashes on Allreduce

[Calin Iaru]

The problem is that the latest mpich2 in combination with IMB 3.1 
generates a data corruption error when running on 2 nodes. IMB was 
compiled with the CHECK flag and TOL set to 0 inside IMB_declare.h. I am 
not sure if this is a transport error or a verification error; it could 
be that the problem lies in the application code.

E:\Program Files\MPICH2\bin>mpiexec.exe -hosts 2 node-1 node-2 
\\node-1\e$\imb-mpi1.exe allreduce
#---------------------------------------------------
#    Intel (R) MPI Benchmark Suite V3.1, MPI-1 part
#---------------------------------------------------
# Date                  : Fri May 23 14:44:12 2008
# Machine               : x86 Family 15 Model 4 Stepping 1, GenuineIntel
# System                : Windows 2003
# Release               : 5.2.3790
# Version               : Service Pack 1
# MPI Version           : 2.0
# MPI Thread Environment: MPI_THREAD_SINGLE



# Calling sequence was:

# \\node-1\e$\imb-mpi1.exe allreduce

# Minimum message length in bytes:   0
# Maximum message length in bytes:   4194304
#
# MPI_Datatype                   :   MPI_BYTE
# MPI_Datatype for reductions    :   MPI_FLOAT
# MPI_Op                         :   MPI_SUM
#
#

# List of Benchmarks to run:

# Allreduce

#-----------------------------------------------------------------------------
# Benchmarking Allreduce
# #processes = 2
#-----------------------------------------------------------------------------
       #bytes #repetitions  t_min[usec]  t_max[usec]  t_avg[usec]      
defects
            0         1000         0.51         0.52         
0.51         0.00
            4         1000        80.30        80.35        
80.33         0.00
1: Error Allreduce, size = 8, sample #0
Process 1: Got invalid buffer:
Buffer entry: 2.300000
0: Error Allreduce, size = 8, sample #0
Process 0: Got invalid buffer:
Buffer entry: 2.300000