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Subject: Re: [OMPI devel] RFC: mpirun command line arugments
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-04-21 18:52:46

Might help if you were to list those CLI params you believe to be removable and/or those you propose to deprecate.

Just a quick glance: I don't see any options that are defunct, though we could argue about how many people use them. So perhaps what we discussed - having a short response for -h that lists the most commonly used ones, and a longer response to --help that contains them all - might be more appropriate?

On Apr 21, 2011, at 9:51 AM, Jeff Squyres wrote:

> WHAT: Deprecate a bunch of old mpirun CLI parameters, remove *most*
> "single dash" long mpirun options, make "mpirun --help" much
> more user friendly
> WHY: `mpirun --help` is currently 232 lines of output. *Ouch*
> Additionally, the Josh/Terry/Jeff affinity re-work will end up
> creating new mpirun CLI options and deprecating the old ones.
> WHEN: Maybe late in the 1.5 series (the new affinity stuff is
> tentatively scheduled for late in the 1.5 series). 1.7 for
> sure.
> WHERE: Mostly in orte/tools/orterun/
> TIMEOUT: ORNL face-to-face OMPI meeting (May 3)
> -----
> We simply have too many options to mpirun.
> - Some could be removed
> - Some should be removed
> - Some should be deprecated (but still available)
> - The --help output needs to be made (much) better
> The new mapping/affinity options effectively replace a bunch of the
> old options. The old mapping/affinity options should be deprecated in
> favor of the new stuff.
> Additionally, there are at least a few old orterun options that are
> either only of interest to developers and/or have an MCA parameter
> backing them (and are fairly uncommonly used such that the MCA param
> could be used instead).
> Finally, we have many options that are available via both "-foo" and
> "--foo" (mostly for hysterical raisins). In most cases, the
> single-dash version should be removed -- per GNU conventions, long
> names should only be available via double-dash. There are a small
> number of single-dash options that must be retained, however, for
> compatibility with other MPI implementations and for mpiexec options
> specifically listed in MPI-2.2:
> -np, -host, -hostfile, -machinefile, -wd, -wdir, -path
> I propose:
> 1. Remove all other single-dash long name options.
> 2. Make all deprecated options only available if the user
> specifies --deprecated-options on the command line (or invokes mpirun
> via mpirun.deprecated-options).
> --> This allows users to keep their existing scripts that use
> deprecated options, but with a glaring signal that "hey, this
> option you're using may disappear in a future version!"
> 3. Revamp the --help output to show a short listing of the most common
> options, and a note that a) the mpirun(1) man page offers much more
> detail, and b) --help-all shows the original, exhaustive CLI option
> listing.
> Extra bonus points would be given for anyone who'd like to implement
> an svn/hg-like "help" command, perhaps something like:
> mpirun help machinefile
> output specifically about the machinefile option...
> I don't have time to do this last part, but it would be a great
> usability feature.
> --
> Jeff Squyres
> jsquyres_at_[hidden]
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