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Subject: Re: [MTT users] Patch to add --local-scratch option
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-09-19 15:44:08


Excellent points.

What about a slightly different approach that would allow us to be
exactly specific?

--scratch=dir1[,dir2[,dir3[,...]]]

And then in the INI file, have fields that indicate which scratch dir
you want them to use. For example, the fact that the OMPI MPI Install
plugin does a build is really a side-effect (not all MPI Install
plugins do builds). So we could have a field:

ompi_build_scratch = &scratch(1)

Or, heck, it doesn't even need to be a function of --scratch at all.
"ompi_build_scratch = <foo>" alone could be good enough.

On Sep 19, 2008, at 12:43 PM, Tim Mattox wrote:

> I've also been thinking about this a bit more, and although
> having the name match the INI section name has some appeal,
> I ultimately think the best name is: --mpi-build-scratch, since
> that is what it does. As Ethan mentioned, the actual MPI
> install goes into --scratch. And on the other side of it,
> the MPI Get also goes into --scratch. The --mpi-build scratch
> is only used for untaring/copying the MPI source tree, running
> config, make, and make check. The actual "make install"
> simply copies the binaries from --mpi-build-scratch into --scratch.
>
> As for names like local-scratch or fast-scratch, they don't convey
> what it's used for, so should it be fast-for-big-files, of fast-for-
> small-files?
> Or similarly, "local" to my cluster, my node, or what?
> I think mpi-build-scratch conveys the most useful meaning, since you
> should pick a filesystem that is tuned (or at least not horrible) for
> doing configure/make.
>
> Unfortunately, I won't have time today to get the patch adjusted
> and into svn. Maybe on Monday.
>
> On Fri, Sep 19, 2008 at 11:23 AM, Ethan Mallove
> <ethan.mallove_at_[hidden]> wrote:
>> On Thu, Sep/18/2008 05:35:13PM, Jeff Squyres wrote:
>>> On Sep 18, 2008, at 10:45 AM, Ethan Mallove wrote:
>>>
>>>>> Ah, yeah, ok, now I see why you wouldl call it --mpi-install-
>>>>> scratch, so
>>>>> that it matches the MTT ini section name. Sure, that works for
>>>>> me.
>>>>
>>>> Since this does seem like a feature that should eventually
>>>> propogate to all the other phases (except for Test run),
>>>> what will we call the option to group all the fast phase
>>>> scratches?
>>>
>>> --scratch
>>>
>>> :-)
>>>
>>> Seriously, *if* we ever implement the other per-phase scratches, I
>>> think
>>> having one overall --scratch and fine-grained per-phase
>>> specifications
>>> fine. I don't think we need to go overboard to have a way to say
>>> I want
>>> phases X, Y, and Z to use scratch A. Meaning that you could just
>>> use
>>> --X-scratch=A --Y-scratch=A and --Z-scratch=A.
>>
>> --mpi-install-scratch actually has MTT install (using
>> DESTDIR) into --scratch. Is that confusing? Though
>> --fast-scratch could also be misleading, as I could see a
>> user thinking that --fast-scratch will do some magical
>> optimization to make their NFS directory go faster. I guess
>> I'm done splitting hairs over --mpi-install-scratch :-)
>>
>> -Ethan
>>
>>
>>>
>>> --
>>> Jeff Squyres
>>> Cisco Systems
>>>
>>> _______________________________________________
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>>> mtt-users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/mtt-users
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>
>
>
> --
> Tim Mattox, Ph.D. - http://homepage.mac.com/tmattox/
> tmattox_at_[hidden] || timattox_at_[hidden]
> I'm a bright... http://www.the-brights.net/
> _______________________________________________
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-- 
Jeff Squyres
Cisco Systems