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improve README.md

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Carl Pearson
2021-06-02 16:26:05 -04:00
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@@ -25,6 +25,14 @@ cmake ..
make
```
CMake will print the MPI environment it is using. For example:
```
-- MPI_CXX_COMPILER: [...]/spectrum-mpi-10.3.1.2-20200121-p6nrnt6vtvkn356wqg6f74n6jspnpjd2/bin/mpicxx
-- MPI_CXX_INCLUDE_DIRS: [...]/spectrum-mpi-10.3.1.2-20200121-p6nrnt6vtvkn356wqg6f74n6jspnpjd2/include
-- MPIEXEC_EXECUTABLE: [...]/spectrum-mpi-10.3.1.2-20200121-p6nrnt6vtvkn356wqg6f74n6jspnpjd2/bin/mpiexec
```
## Run all tests
`run-all.sh` attempts to discover certain environments automatically.