[StarCluster] Placement groups

[Ron Chen]

I think I will need to leave this question to Justin @ MIT, as I am not familiar with the starcluster source code. (I am only a developer of Open Grid Scheduler, the open source Grid Engine.)

However, you can still run jobs on the master machine. GE & NFS serving on the master do not use lots of CPU cycles.

OTOH, if your jobs generate tons of data, then you might want to place the master on a CC1 or CC2 or else NFS serving is limited by not having the 10 GigE network.


 -Ron




________________________________
From: Sergio Mafra <sergiohmafra at gmail.com>
To: Ron Chen <ron_chen_123 at yahoo.com> 
Cc: "smafra at ons.org.br" <smafra at ons.org.br>; "starcluster at mit.edu" <starcluster at mit.edu> 
Sent: Tuesday, May 15, 2012 9:26 PM
Subject: Re: Placement groups


Nice to know. This leads to another question. If you mix c1 instances (for master) with cc instances (for nodes) you will probably be out of the 10 Gbps network since placement groups works only for cluster instances, right?
So if you really need bandwidth you will have to provision all instances as cluster instances even though the master would not need to be that big.

Sergio

Em terça-feira, 15 de maio de 2012, Ron Chen escreveu:

The answer is yes.
>
>If you grep the source, you will find references to create_placement_group(), get_placement_group() and many placement group functions in the starcluster source code.
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>
> -Ron
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>
>
>
>________________________________
>From: Sergio Mafra <sergiohmafra at gmail.com>
>To: "starcluster at mit.edu" <starcluster at mit.edu>
>Sent: Tuesday, May 15, 2012 8:36 PM
>Subject: [StarCluster] Placement groups
>
>
>Does StarCluster deploy the cc instances on a placement group to take advantage of a 10 Gbps network?
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>Best Regards,
>
>Sergio Mafra
>
>
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