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Shared mem support flags

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Guido Cossu
2018-03-21 10:25:04 +00:00
parent ae6dcd057d
commit 90b8e57765
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_pages/docs/comm_interfaces.md
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@ -20,4 +20,13 @@ The following options can be use with the `--enable-comms=` option to target dif
For the MPI interfaces the optional `-auto` suffix instructs the `configure` scripts to determine all the necessary compilation and linking flags. This is done by extracting the informations from the MPI wrapper specified in the environment variable `MPICXX` (if not specified `configure` will scan though a list of default names). The `-auto` suffix is not supported by the Cray environment wrapper scripts. Use the standard wrappers ( `CXX=CC` ) set up by Cray `PrgEnv` modules instead.
### Shared memory communications support
| `<shm>` | Description |
| ------------- | ----------------------------------------------------------------- |
| `shmnone` | uses anonymous spaces, use only for 1 MPI rank per node |
| `shmopen` | uses `shm_open` to allocate a shared memory space for inter socket communications. It used a unique file name in `/dev/shm` associated to the user. |
| `hugetlb` | optional [libhugetlbfs](https://github.com/libhugetlbfs/libhugetlbfs) support to map the shared memory allocation into huge 2M pages |
{% include paginator.html %}