[GE users] app that uses all cores on a host

cjf001 john.foley at motorola.com
Tue Sep 1 16:01:24 BST 2009


crtierney42 wrote:

> cjf001 wrote:
> 
>>Guys -
>>
>>Don't know if this is common or easy or not, but I figured I'd ask here
>>first....
>>
>>I'm adding a new app to our cluster - Agilent's "Momentum". This simulator
>>just runs on a single host at a time (ie, no parallel environment), but
>>it's "smart" enough to use all the available CPUs and cores on the host
>>it's running on.
>>
>>So, I think this is going to be a problem for SGE. It's going to think
>>it's assigning a job to 1 slot, when in reality it's going to use all
>>the slots on that host. Also, on the flip side, if there's a single slot
>>available on a multi-core host, it might assign the Momemtum job to that
>>slot, but then Momentum will take over all the cores and interfere with
>>the other jobs running there.
>>
>>Is there a graceful way of handling this kind of app ? I'm using SGE6.2_u2.
>>
>>     Thanks,
>>
>>       John
>>
>>
>>
> 
> 
> You could set the number of slots on the host to one (use qconf -se for
> each host, under complex_values set slots=1).  Or, you could create
> a parallel environment, set the allocation_rule to pe_slots, then ensure that
> all users always request the full number of slots on each host (with a wrapper
> script).
> 
> Craig
> 
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Thanks - I think I will use your second suggestion - it seems to work OK.

      John


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