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Advanced multi threading support in CH4
Hajime Fujita edited this page Nov 9, 2018
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MPICH 3.3rc1 (released 11/9/2018) introduced several improvements to MPI_THREAD_MULTIPLE. As of 3.3rc1, this feature is not enabled by default, therefore a special build configuration is needed.
The new improvements are implemented inside the CH4 device. So CH4 needs to be selected when building MPICH.
Example configure lines:
./configure --with-device=ch4:ofi --with-libfabric=<path/to/ofi/install>
./configure --with-device=ch4:ucx --with-ucx=<path/to/ucx/install>
Refer to MPICH README for more details on how to build CH4.
3.3rc1 introduced two threading models.
- Trylock-enqueue (
trylock) - Handoff (
handoff)
Build time configurations:
--enable-thread-cs=per-vni --enable-izem=queue --with-zm-prefix=yes --enable-ch4-mt=trylock --with-hwloc=<path/to/hwlocinstall>
Runtime configurations:
- None needed
Build time configurations:
--enable-thread-cs=per-vni --enable-izem=queue --with-zm-prefix=yes --enable-ch4-mt=handoff --with-hwloc=<path/to/hwlocinstall>
Runtime configurations:
- Set the environment variable:
MPIR_CVAR_ASYNC_PROGRESS=1