[Swift-user] pbs ppn count and stuff

[Mihael Hategan]

Sorry. This was meant for swift-devel.

Mihael

On Mon, 2011-01-24 at 10:46 -0800, Mihael Hategan wrote:
> So I think some of the problems with ppn are as follows:
> 1. count in cog means number of processes. count in PBS means number of
> nodes.
> 2. when the number of nodes requested was 1 but ppn > 1, the multiple
> job scheme was not enabled so, despite having multiple lines in
> PBS_NODEFILE, only one process would get started. If count was > 1 then
> PBS would understand that count*ppn lines should be in PBS_NODEFILE,
> which would result in that number of processes be started. In other
> words there was no way to tell PBS to start 4 jobs on only one node.
> 
> So:
> 
> - I changed this to be consistent with 1. Count means number of
> processes to be started. This imposes the restriction that count % ppn =
> 0. If not, the pbs provider will throw an exception. 
> - I also added mppnppn if USE_MPPWIDTH is enabled.
> 
> This is in trunk.
> 
> Mihael
> 
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