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pdc-summer-school
mpi-lab-exercises
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32409713
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32409713
authored
2 years ago
by
Dirk Pleiter
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README.md
lab2/README.md
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README.md
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32409713
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@@ -42,7 +42,7 @@ ftn my_prog.f90
First it is necessary to book a node for interactive use:
```
salloc -
A <alloc
ation
-
name
> -p main -N 1 -t 1:0:0
salloc -
p shared --nodes=1 --cpus-per-task=32 -t 0:30:00 -A edu22.summer --reserv
ation
=<
name
-of-reservation>
```
You might also need to specify a
**reservation**
by adding the flag
`--reservation=<name-of-reservation>`
.
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@@ -49,14 +49,14 @@ 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 -
N 1 --ntasks-per-node=2 -A <project> -t 00:05:00
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
```
or on separate nodes, e.g.
```
salloc -
N 2 --ntasks-per-node=1 -A <project>
-t
0
0:0
5
:00
salloc -
p main --nodes=2 --cpus-per-task=2
-t 0:
3
0:00
-A edu22.summer
mpirun -n 2 ./mpi_latency.x
```
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