Hi,
When I ran with IMPI benchmark, it always got an obvious performance drop when buffer size>128MB with OFI, is this reasonable or there is some configuration? Thanks
mpirun -genv I_MPI_STATS=ipm -genv I_MPI_FABRICS=tmi -n 2 -ppn 1 -f hostfile IMB-MPI1 -msglog 20:29 -iter 20000,1000 uniband -time 1000000 -mem 2
#---------------------------------------------------
# Benchmarking Uniband
# #processes = 2
#---------------------------------------------------
#bytes #repetitions Mbytes/sec Msg/sec
0 20000 0.00 607266
1048576 1000 8356.72 7970
2097152 500 8847.71 4219
4194304 250 9295.13 2216
8388608 125 9205.23 1097
16777216 62 9498.35 566
33554432 31 9577.55 285
67108864 15 9564.31 143
134217728 7 9523.83 71
268435456 3 2700.73 10 <-----------performance dropped much
536870912 1 3514.32 7