From ec44a25070f99b6e1d96886fe3990ad560ee63c0 Mon Sep 17 00:00:00 2001 From: Jeff Squyres Date: Fri, 19 Jun 2015 13:32:18 -0700 Subject: [PATCH] README: clarify OMPI's same-version requirements Clarify that Open MPI requires the exact same version number in all parts of an Open MPI / OSHMEM job for it to work properly. --- README | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/README b/README index 25b06e89bc..bf3d3001ed 100644 --- a/README +++ b/README @@ -1395,6 +1395,12 @@ Note that this definition encompasses several things: * mpirun / oshrun command line options * MCA parameter names / values / meanings +However, this definition only applies when the same version of Open +MPI is used with all instances of the runtime and MPI / OSHMEM +processes in a single MPI job. If the versions are not exactly the +same everywhere, Open MPI is not guaranteed to work properly in any +scenario. + Software Version Number ----------------------- @@ -1426,6 +1432,8 @@ format. Each of the three numbers has a specific meaning: user-observable changes or new features, only the third integer will be increased (e.g., from v4.3.0 to v4.3.1). +The "A.B.C" version number may optionally be followed by a Quantifier: + * Quantifier: Open MPI version numbers sometimes have an arbitrary string affixed to the end of the version number. Common strings include: