LSF Version 7.3 - Platform LSF Configuration Reference

configuring your modules under SCH_PLUGIN in the PluginModules section of
lsb.modules.
The directory
LSF_TOP/7.0/misc/examples/external_plugin/
contains sample plugin code. See Platform LSF Programmer’s Guide for more detailed
information about writing, building, and configuring your own custom scheduler plugins.
RB_PLUGIN
Description
RB_PLUGIN specifies the shared module name for resource broker plugins. Resource broker
plugins collect and update job resource accounting information, and provide it to the
scheduler.
Normally, for each scheduler plugin module, there is a corresponding resource broker plugin
module to support it. However, the resource broker also supports multiple plugin modules
for one scheduler plugin module.
For example, a fairshare policy may need more than one resource broker plugin module to
support it if the policy has multiple configurations.
A scheduler plugin can have one, multiple, or none RB plugins corresponding to it.
Example
NAME RB_PLUGIN
schmod_default ()
schmod_fairshare (rb_fairshare)
Default
Undefined
SCH_DISABLE_PHASES
Description
SCH_DISABLE_PHASES specifies which scheduler phases, if any, to be disabled for the
plugin. LSF scheduling has four phases:
1.
Preprocessing — the scheduler checks the readiness of the job for scheduling and prepares
a list of ready resource seekers. It also checks the start time of a job, and evaluates any job
dependencies.
2.
Match/limit — the scheduler evaluates the job resource requirements and prepares
candidate hosts for jobs by matching jobs with resources. It also applies resource allocation
limits. Jobs with all required resources matched go on to order/allocation phase. Not all
jobs are mapped to all potential available resources. Jobs without any matching resources
will not go through the Order/Allocation Phase but can go through the Post-processing
phase, where preemption may be applied to get resources the job needs to run.
3.
Order/allocation — the scheduler sorts jobs with matched resources and allocates
resources for each job, assigning job slot, memory, and other resources to the job. It also
checks if the allocation satisfies all constraints defined in configuration, such as queue slot
limit, deadline for the job, etc.
lsb.modules
Platform LSF Configuration Reference 233