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Subject: Re: [OMPI users] Xgrid and choosing agents...
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-07-12 10:45:10


On Jul 12, 2009, at 6:58 AM, Klymak Jody wrote:

> Hi Ralph,
>
> On 12-Jul-09, at 4:07 AM, Ralph Castain wrote:
>
>> Assuming that Scoreboard is appropriately licensed (i.e., is not
>> licensed under GPL, but preferably something like FreeBSD), and
>> that it has an accessible API, then we can link against it when in
>> that environment and interact any way we desire - including asking
>> Scoreboard for its recommended list of nodes.
>>
>
> The info I have is all from http://www.macresearch.org/node/4654.
>
> To use scoreboard you pass a run-time argument to the xgrid command
> using "-art" and "-artid".
>
> xgrid -job submit -art scorescript.pl -artid score MyJob
>
> The script can return any score calculated from any of the machine
> attributes, i.e. you can send the job to machines with more than 2
> Gb of memory, or that are faster than 2GHz. So its a pretty nice
> feature. I don't think there is any way to manually query the nodes.

Interesting! I'll look and see if/how we can do the query from inside
OMPI.

Thanks!
Ralph

>
> Unfortunately, I'm not sure if it is possible to do this via the API
> which does not look to have any hooks into Scorecard:
>
> http://developer.apple.com/documentation/Performance/Conceptual/XgridDeveloper/index.html#/
> /apple_ref/doc/framework/XgridFoundation_reference
>
> Curiously, looking at the API, I further get the impression it has
> no concept of identifying the nodes. The xgrid controller assigns
> them, and there does not seem to be a mechanism for the user to
> choose. So until the API is improved to account for the Scoreboard
> capability I guess this can't be accessed via openMPI.
>
> Thanks a lot for thinking about this. As I said, I have a solution
> now that works just great, so this is all just for curiousity's sake
> at this point.
>
> Cheers, Jody
>
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