Commit 1610f757 authored by Committed by Brad King
FindMPI: Use physical cores for MPIEXEC_MAX_NUMPROCS
Since commit v3.9.0-rc1~224^2~1 (FindMPI: MPIEXEC handling improvements, 2017-04-21) the `ProcessorCount` module is being used to initialize `MPIEXEC_MAX_NUMPROCS`. However, this leads to the logical cores being counted rather than the physical ones, and some MPI implementations like OpenMPI will error if mpiexec is called with that number. Switch it to the number of physical cores using `cmake_host_system_information`. This ensures that if `MPIEXEC_MAX_NUMPROCS` is being used to set up MPI tests with CTest or similar that the tests won't spuriously fail due to OpenMPI refusing to start the application.
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