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Commit fc5e5428 authored by Xin Li's avatar Xin Li
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updated README.md

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......@@ -47,7 +47,7 @@ salloc -p shared --nodes=1 --ntasks=16 -t 0:30:00 -A edu22.summer --reservation=
You might also need to specify a **reservation** by adding the flag `--reservation=<name-of-reservation>`.
For the 2022 PDC Summer School the reservation name is ``summer-<date>``, where ``date`` is to be provided in the format ``YYYY-MM-DD``, e.g. ``summer-2022-08-16``.
Then the mpirun command is used to launch an MPI application:
Then the srun command is used to launch an MPI application:
```
srun -n 16 ./example.x
......
......@@ -49,15 +49,15 @@ Use ``mpi_wtime`` to compute latency and bandwidth with the bandwidth and latenc
For this exercise you should compare different setups where (a) both MPI ranks are on the same node, e.g.
```
salloc -p shared --nodes=1 --cpus-per-task=2 -t 0:30:00 -A edu22.summer --reservation=<name-of-reservation>
mpirun -n 2 ./mpi_latency.x
salloc -p shared --nodes=1 --ntasks=2 -t 0:30:00 -A edu22.summer --reservation=<name-of-reservation>
srun -n 2 ./mpi_latency.x
```
or on separate nodes, e.g.
```
salloc -p main --nodes=2 --cpus-per-task=2 -t 0:30:00 -A edu22.summer
mpirun -n 2 ./mpi_latency.x
salloc -p shared --nodes=2 --ntasks=2 -t 0:30:00 -A edu22.summer --reservation=<name-of-reservation>
srun -n 2 ./mpi_latency.x
```
Compare the different results and reason about the observed values.
......
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