external prrte: Create symlink to prrterun in bindir.

[awlauria]

Fixes a bug where out-of-the-box ompi builds with an
external prrte will fail to find prterun.

Signed-off-by: Austen Lauria [email protected]

[bwbarrett]

I'm not sure I understand this patch. There is not supposed to be a prterun in the OMPI install tree. If you're using an external PRRTE, the expectation is that PRRTE's install_prefix/bin is in your path.

[awlauria]

If adding a symlink is a problem an easy alternative would be to just have mpirun resolve it via PRTE_PATH.

Of course it could be solved by using --prefix ore adding it to the PATH, but I'm not sure why we couldn't make this a bit easier for users.

[rhc54]

Guess it all depends on how much you want to expose OMPI internals to the user. Been getting some hits back where someone else installs OMPI, and then a user (who doesn't know or care what PRRTE is) gets a "cannot find the prterun executable" when trying to execute mpirun. The immediate response is "what the heck is prterun?", upon which you have to laboriously explain what PRRTE is and how OMPI uses it, and then tell them they have to modify their paths.

The goal of this patch was to remove that ambiguity by ensuring mpirun can find prterun, thereby saving a lot of repetitive explanations.

[bwbarrett]

I'm all for making sure that happens, but we have an mpirun executable. Having it properly do a path search seems like a much better option than adding a symlink so that there are now two prteruns in your path.

[awlauria]

Sounds good - opened #9963 to implement that.