AENEAS
Communications speed in MPIch
The following test program is part of the MPIch standard distribution.
Communications are exchanged between two nodes (node00 and node01 here).
Expected hardware peak rate is 12.5 Mbytes/sec.
node00:/home/hamberh/mpi/test> ./mpirun -np 2 ./systest
Process 0 is alive on node00.ps.uci.edu
Process 1 is alive on node01.ps.uci.edu
Options: 0=quit, 1=Hello, 2=Ring : 2
Ring test...time network performance
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Input maximum message size: 1000000
len=1 bytes, used= 0.034863 sec., rate=0.000057 Mbytes/sec
len=2 bytes, used= 0.000329 sec., rate=0.012158 Mbytes/sec
len=4 bytes, used= 0.000325 sec., rate=0.024615 Mbytes/sec
len=8 bytes, used= 0.000327 sec., rate=0.048930 Mbytes/sec
len=16 bytes, used= 0.000328 sec., rate=0.097561 Mbytes/sec
len=32 bytes, used= 0.000328 sec., rate=0.195122 Mbytes/sec
len=64 bytes, used= 0.000333 sec., rate=0.384384 Mbytes/sec
len=128 bytes, used= 0.000346 sec., rate=0.739884 Mbytes/sec
len=256 bytes, used= 0.000366 sec., rate=1.398907 Mbytes/sec
len=512 bytes, used= 0.000458 sec., rate=2.235808 Mbytes/sec
len=1024 bytes, used= 0.000672 sec., rate=3.047619 Mbytes/sec
len=2048 bytes, used= 0.000946 sec., rate=4.329810 Mbytes/sec
len=4096 bytes, used= 0.001415 sec., rate=5.789399 Mbytes/sec
len=8192 bytes, used= 0.011025 sec., rate=1.486077 Mbytes/sec
len=16384 bytes, used= 0.019719 sec., rate=1.661748 Mbytes/sec
len=32768 bytes, used= 0.039988 sec., rate=1.638892 Mbytes/sec
len=65536 bytes, used= 0.020107 sec., rate=6.518725 Mbytes/sec
len=131072 bytes, used= 0.040206 sec., rate=6.520022 Mbytes/sec
len=262144 bytes, used= 0.052425 sec., rate=10.000725 Mbytes/sec
len=524288 bytes, used= 0.131467 sec., rate=7.975964 Mbytes/sec
clock resolution in seconds: 0.00000600