There are several way to control which hosts the supervisor will select when deciding where to start job instances on the farm.
Hosts - send only to an explicit set of workers
Send only to an explicit pre-defined group of workers
Select hosts in a certain preferential order
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A restriction is really defined as a "filter" for hosts based upon information in the queuing algorithm. In the priority/cluster queuing system, one specifies their restrictions by directory structure format:
/[<segment>/][<segment>/][+|*]
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The restriction value is actually evaluated as an expression, and is specified in a "this cluster or that cluster or the other cluster" type of string, with the "||" symbol to mean "or"
Example
Allows hosts/jobs in /hello/world, but do not include lower levels:
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Allows hosts in /hello or /goodbye:
/hello || /goodbye
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Qube allows users to specify a list of hosts, for the job to run on. This is a comma-delimited list of hostnames.
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Example
% qbsub --omithosts "qb001,qb002" command
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Qube allows the administrator to organize the farm into clusters or host groups. These groups have no hierarchy, and hosts are allowed membership in multiple groups. In order to restrict a job to a specific set of hosts, the user may specify in the 'group' field of the job, which groups they want the job restricted to.
Example
% qbsub --groups "vfx,character" Render my/file.ma
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This is the opposite of the Host Groups option, where the job will restrict itself from running upon any hosts which are contained by the specified groups.
Example
% qbsub --omitgroups "vfx,character" command
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By default Qube chooses any host in the list of hosts which qualify. If given a choice, a job is allowed to prefer a particular host based upon its attributes. This is established using the Qube resources and priorities defined earlier in the Requirements section of this document.
Syntax:
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