[mvapich-discuss] Multi bandwidth message rate benchmark results (osu_mbw_mr)

[Johnny Devaprasad]

Hi all,

My run of osu_mbw_mr provides the following results.

$ mpirun_rsh -np 5280 -machinefile /tmp/382.1.big/machines
 /home/cmsupport/mvapich2/osu_benchmarks/osu_mbw_mr

# OSU MPI Multiple Bandwidth / Message Rate Test v3.3
# [ pairs: 2640 ] [ window size: 64 ]
# Size                    MB/s          Messages/s
1                        41.34         41339222.14
2                        78.96         39479870.86
4                       156.71         39176501.04
8                       323.37         40421330.96
16                      613.74         38358861.20
32                     1269.45         39670442.09
64                     2388.31         37317373.14
128                    4254.61         33239163.57
256                    7978.03         31164175.18
512                   15421.78         30120662.24
1024                  29769.91         29072181.60
2048                  47861.16         23369709.15
4096                  65596.75         16014831.90
8192                  70488.55          8604559.21
16384                 70629.90          4310907.20
32768                 71233.64          2173878.15
65536                 71501.51          1091026.41
131072                71659.65           546719.78
262144                71741.03           273670.31
524288                71765.61           136882.04
1048576              -39592.43           -37758.29
2097152               16099.89             7677.02
4194304              -11749.33            -2801.26

Is there an explanation on why the data rate has negative values for some of
the larger message sizes?

Mvapich2 version: 1.6
Number of nodes: 110
Number of cores : 5280 (48 cores per node)

IB Information:
--------------------
InfiniBand: Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB
QDR / 10GigE] (rev b0)
$ ibstat
CA 'mlx4_0'
CA type: MT26428
Number of ports: 1
Firmware version: 2.7.626
Hardware version: b0

Regards,
Johnny
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