Depends on the version, but if you are using something in the v2.x range, you 
should be okay with just one installed version

> On Feb 17, 2017, at 4:41 AM, Mark Dixon <m.c.di...@leeds.ac.uk> wrote:
> 
> Hi,
> 
> We have some users who would like to try out openmpi MPI_THREAD_MULTIPLE 
> support on our InfiniBand cluster. I am wondering if we should enable it on 
> our production cluster-wide version, or install it as a separate "here be 
> dragons" copy.
> 
> I seem to recall openmpi folk cautioning that MPI_THREAD_MULTIPLE support was 
> pretty crazy and that enabling it could have problems for 
> non-MPI_THREAD_MULTIPLE codes (never mind codes that explicitly used it), so 
> such an install shouldn't be used unless for codes that actually need it.
> 
> Is that still the case, please?
> 
> Thanks,
> 
> Mark
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