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-rw-r--r--release_docs/INSTALL_parallel10
1 files changed, 7 insertions, 3 deletions
diff --git a/release_docs/INSTALL_parallel b/release_docs/INSTALL_parallel
index f32fffc..d3d7830 100644
--- a/release_docs/INSTALL_parallel
+++ b/release_docs/INSTALL_parallel
@@ -102,7 +102,7 @@ qsub -I -q debug -l mppwidth=8
- configure HDF5:
RUNSERIAL="aprun -q -n 1" RUNPARALLEL="aprun -q -n 6" FC=ftn CC=cc /path/to/source/configure --enable-fortran --enable-parallel --disable-shared
- RUNSERIAL and RUNPARALLEL tells the library how it should launch programs that are part of the build procedure.
+ RUNSERIAL and RUNPARALLEL tell the library how it should launch programs that are part of the build procedure.
- Compile HDF5:
gmake
@@ -155,12 +155,16 @@ to run a parallel application on one processor and on many processors. If the
compiler is `mpicc' and the user hasn't specified values for RUNSERIAL and
RUNPARALLEL then configure chooses `mpiexec' from the same directory as `mpicc':
- RUNSERIAL: /usr/local/mpi/bin/mpiexec -np 1
- RUNPARALLEL: /usr/local/mpi/bin/mpiexec -np $${NPROCS:=6}
+ RUNSERIAL: mpiexec -n 1
+ RUNPARALLEL: mpiexec -n $${NPROCS:=6}
The `$${NPROCS:=6}' will be substituted with the value of the NPROCS
environment variable at the time `make check' is run (or the value 6).
+Note that some MPI implementations (e.g. OpenMPI 4.0) disallow oversubscribing
+nodes by default so you'll have to either set NPROCS equal to the number of
+processors available (or fewer) or redefine RUNPARALLEL with appropriate
+flag(s) (--oversubscribe in OpenMPI).
4. Parallel test suite
----------------------