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Subject: Re: [OMPI devel] [RFC] mca_base_open() NULL
From: Josh Hursey (jjhursey_at_[hidden])
Date: 2008-05-08 11:05:22


Sounds good.

I can probably try to finish the patch in the next couple weeks, but
if someone needs it before I get a chance to look at it let me know.

Once the implementation is complete, then the RFC will be updated with
a termination date for further input.

Cheers,
Josh

On May 8, 2008, at 11:00 AM, Jeff Squyres wrote:

> On May 8, 2008, at 9:32 AM, Josh Hursey wrote:
>
>> I think 'all' would be a nice symmetric addition to complement 'none'
>> and then this would allow users to specify the "select best from all
>> available" option on the command line.
>
> Ok, if you accept "all" and "none" as friendly ammendments to your
> RFC, I think I'm done with input there. :-)
>
> Any other comments on the RFC?
>
>> Disallowing the NULL default string I think would have some
>> repercussions throughout the code requiring a change in the way we
>> use
>> MCA parameters. For example, many component selection logics use the
>> NULL value as the current 'select best from all' indicator. Other MCA
>> parameters take the NULL value to indicate that the user did not set
>> any value for this string parameter and thus it can be ignored. Maybe
>> we can try to add a deprecation warning message when this happens to
>> gauge it's frequency.
>
>
> There's no burning need to do this ASAP; let's add this to the list of
> items to talk about in the tech meeting. Perhaps one of us could do a
> little prep before the meeting to figure out:
>
> - how often NULL is given as a default OMPI MCA string param (probably
> quite often) -- easy enough to find out by putting a counter/
> opal_output in the string registration function
>
> - how often NULL is *required* by the logic for one reason or another
> (probably a little more tricky to count)
>
> --
> Jeff Squyres
> Cisco Systems
>
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