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
Host Groups: Send only to an explicit pre-defined group of workers
Host Order: 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; the values are one or more cluster names. In the priority/cluster queuing system, one specifies their restrictions by directory structure format:
/[<segment>/][<segment>/][+|*]
- + means all hosts at that level and below in the hierarchy.
- * means only hosts at that level.
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:
/hello/world
Allows hosts/jobs in /good/bye and all levels below:
/hello/world/+
Allows only hosts/jobs below /hello/world/… but not including /hello/world:
/hello/world/*
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.
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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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The sign in the expression is used to determine if the job would prefer the smallest or the largest value possible. If not specified, sign is equal to .
The possible values for for sign are are "+" or "-". The , and if not specified, sign defaults to "+". The "+" is used to specify using the highest value first, and the "-" is to use the lowest value. These can be combined and will be used in order specified.
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