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ocaisa merged 1 commit into from
Jun 22, 2026
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repeat warning on OpenMPI oversubscribe #12

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18 changes: 17 additions & 1 deletion docs/installing-on-top.md
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Expand Up @@ -355,7 +355,9 @@ Our output is full of errors like
```
What went wrong?

??? warning "`There are not enough slots available in the system to satisfy...`"
### Problem with MPI in Slurm job context

!!! warning "`There are not enough slots available in the system to satisfy...`"

If you see a different error which starts with `There are not enough slots available in the system to satisfy...`
this is because you are trying to run an MPI job while already in a Slurm job context (perhaps an interactive
Expand Down Expand Up @@ -652,6 +654,20 @@ Total Test time (real) = 2.03 sec
have explicitly verified that our package is using EESSI for all it's dependencies and is using the runtime loader
provided by EESSI.

!!! Warning "Problem with MPI in Slurm job context"

If the tests are still failing, it's probably due to errors that include:
```
There are not enough slots available in the system to satisfy...
```

OpenMPI needs to be configured to allow oversubscription, by running:
``` { .bash .copy }
export PRTE_MCA_rmaps_default_mapping_policy=:oversubscribe
```

See also this [subsection](#problem-with-mpi-in-slurm-job-context).

## Extending EESSI using `EESSI-extend`

While the `buildenv` may allow many applications to be built directly on top of EESSI, it cannot work miracles
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