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Subject: Re: [OMPI devel] add_procs
From: Richard Graham (rlgraham_at_[hidden])
Date: 2009-02-05 15:26:39


I would leave the code alone. The intent was for (A), but it is not used
for that. It is not in the performance critical region, works correctly as
we use it today, and putting it back later on would be a hassle not needed.

Rich

On 2/5/09 2:41 PM, "Eugene Loh" <Eugene.Loh_at_[hidden]> wrote:

> BTLs have "add_procs" functions. E.g., my own parochial interests are
> with the sm BTL and there is a mca_btl_sm_add_procs() function. I'm
> trying to get a feel for how likely it is that this function would be
> called more than once. There is code in there to support the case where
> it's called multiple times: e.g., don't just call it once during
> MPI_Init, but again during program execution to add more processes.
>
> Maybe we can do this the "multiple choice" method:
>
> A) That code is in there for standard purposes (dynamically added
> processes or something?) and is robust and routinely tested.
>
> B) That code was in there because we had hoped to support this stuff
> someday, but I'm not sure if it works. It's not really tested and
> rarely used by our users. We should clean it up sometime so that we're
> sure it's doing what it should.
>
> C) That code was a fantasy we had when we first started coding this
> stuff, and for sure there is no prayer of that stuff working properly
> today or any time in the foreseeable future without major work. Come to
> think of it, we'd be doing ourselves a service by ripping all that stuff
> out.
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