It is available for evaluation.
Details about the experiments |
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Our measurements respect the following condition: the data sent is in a buffer provided by the user program, this buffer can be anywhere in the program memory space and is given to the send call.
The same thing apply for the receive buffer: the user program can pass any valid pointer to the receive call. We use the blocking send and receive MPI calls.We have measured the performance of ping-pong tests where one master sends some data to a slave, the latter receives it and sends back the same message (of same size) to the master.
The timing results have been obtained by taking the time between the beginning of the send call and the end of the receive call on the master and dividing it by 2 to obtain one-way latency and message bandwith.
The values in the table are the median times of 100 successive experiments.These tests were run between 2 Pentiums Pro 200 Mhz.
| Size of the messages (Bytes) | Bandwidth (MB/s) | Elapse Time one-way (us) |
|---|---|---|
| 0 | 0.00 | 11.02 |
| 4 | 0.35 | 11.41 |
| 8 | 0.65 | 12.33 |
| 16 | 1.22 | 13.16 |
| 32 | 2.32 | 13.80 |
| 64 | 4.02 | 15.93 |
| 128 | 6.33 | 20.22 |
| 256 | 4.49 | 57.04 |
| 512 | 8.98 | 57.01 |
| 1024 | 15.78 | 64.89 |
| 2048 | 26.79 | 76.45 |
| 4096 | 41.12 | 99.62 |
| 8192 | 56.57 | 144.82 |
| 16384 | 43.24 | 378.94 |
| 32768 | 56.08 | 584.32 |
| 65536 | 59.05 | 1109.89 |
| 131072 | 63.85 | 2052.77 |
| 262144 | 65.00 | 4033.11 |
| 524288 | 65.57 | 7996.01 |
| 1048576 | 65.76 | 15944.64 |
| 2097152 | 66.12 | 31718.34 |
| 4194304 | 66.32 | 63242.74 |
| 8388608 | 66.33 | 126465.65 |
The NAS parallel benchmarks |
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The NAS Parallel
Benchmarks were run on Pentiums Pro 200. Results for
other machines come from the NPB home
page.
MPI-BIP on PPro 200 IBM SP (66/WN) Cray T3E-900 SGI Origin 2000-195 Sun Enterprise 4000 Mop/s Speedup Mop/s Speedup Mop/s Speedup Mop/s Speedup Mop/s Speedup IS @ 4 proc 2.44 4.5 2.2 3.1 3.2 N/A 2.1 3.8 1.6 3.8 IS @ 8 proc 2.11 8.8 2.0 5.6 3.8 N/A 2.4 8.6 1.5 6.9 LU @ 4 proc 23.68 6 59.0 3.7 67.6 N/A 96.8 N/A 36.9 4.1 LU @ 8 proc 22.73 11.6 57.2 7.1 66.4 N/A 103.3 N/A 37.3 8.4 SP @ 4 proc 10.10 3.4 42.1 3.6 43.0 N/A 60.3 N/A 25.0 3.7
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Last modified: Mon Jun 7 14:35:27 CEST 1999 © BIP team |