[Swift-devel] Changing ppn on a per-application basis

[Michael Wilde]

David, when we discussed this I couldnt recall the recent feature that Justin added for this. I found it when I saw this post. Its at:

http://www.ci.uchicago.edu/swift/guides/trunk/userguide/userguide.html#_dynamic_profiles

Seems to do what you need; I suspect it needs testing.

- Mike


----- Original Message -----
> From: "David Kelly" <davidk at ci.uchicago.edu>
> To: swift-devel at ci.uchicago.edu
> Sent: Thursday, August 2, 2012 12:24:07 PM
> Subject: [Swift-devel] Changing ppn on a per-application basis
> Hello,
> 
> I have a user who would like to change ppn on a per-application basis.
> Is this possible right now? As far as I know, the only way to do this
> is currently is to create separate pool entries with varying ppn
> values.
> 
> The example he gave me is this: the cluster he is working on supports
> node sharing. For some applications he may want to use all available
> processors. For other applications, especially those which use GPUs to
> do the heavy lifting, he may only want 1 ppn and leave the other
> processors for other users. I can also envision cases where ppn may
> need to be adjusted based on memory requirements or possibly based on
> some data that isn't known until the program runs.
> 
> Mike and I were talking about this the other day. One of the ideas he
> suggested was adding a new value like stdout to the app definition.
> Something like this I'd imagine:
> 
> app (file o) cat (file i, int myppn)
> {
> cat @i stdout=@o ppn=myppn;
> }
> 
> From what I can gather, the user is only interested in ppn at the
> moment. But it may be useful to eventually have a generic way to
> override all settings in sites.xml from an app function.
> 
> David
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-- 
Michael Wilde
Computation Institute, University of Chicago
Mathematics and Computer Science Division
Argonne National Laboratory