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Improve MPI example to avoid confusion of number of processes / total number of GPUs.

https://github.com/NVIDIA/nccl-tests/issues/54#issuecomment-1212023369
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Sylvain Jeaugey 2023-01-03 08:47:43 +01:00 committed by GitHub
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@ -29,9 +29,9 @@ Run on 8 GPUs (`-g 8`), scanning from 8 Bytes to 128MBytes :
$ ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 8
```
Run with MPI on 40 processes (potentially on multiple nodes) with 4 GPUs each :
Run with MPI on 10 processes (potentially on multiple nodes) with 4 GPUs each, for a total of 40 GPUs:
```shell
$ mpirun -np 40 ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 4
$ mpirun -np 10 ./build/all_reduce_perf -b 8 -e 128M -f 2 -g 4
```
### Performance