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-rw-r--r--development/valgrind/README6
1 files changed, 6 insertions, 0 deletions
diff --git a/development/valgrind/README b/development/valgrind/README
index 5f3882ddea..7e4eec3411 100644
--- a/development/valgrind/README
+++ b/development/valgrind/README
@@ -11,3 +11,9 @@ three experimental tools: a heap/stack/global array overrun detector,
a different kind of heap profiler, and a SimPoint basic block vector
generator. It runs on the following platforms: x86/Linux, AMD64/Linux,
PPC32/Linux, PPC64/Linux, ARM/Linux, x86/MacOSX and AMD64/MacOSX.
+
+Optional dependency: either mpich or openmpi. If one of these is
+found, valgrind will include the MPI wrapper, which allows using
+valgrind with software that uses the MPI message passing standard.
+Note that only one of mpich or openmpi should be installed, as they
+conflict with each other.