Platform LSF Administration Guide Version 6.2

Chapter 39
Tuning the Cluster
Administering Platform LSF
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Adjusting LIM Parameters
There are two main goals in adjusting LIM configuration parameters: improving
response time, and reducing interference with interactive use. To improve response time,
tune LSF to correctly select the best available host for each job. To reduce interference,
tune LSF to avoid overloading any host.
LIM policies are advisory information for applications. Applications can either use the
placement decision from LIM, or make further decisions based on information from
LIM.
Most of the LSF interactive tools use LIM policies to place jobs on the network. LSF
uses load and resource information from LIM and makes its own placement decisions
based on other factors in addition to load information.
Files that affect LIM are
lsf.shared, lsf.cluster.cluster_name, where
cluster_name is the name of your cluster.
RUNWINDOW parameter
LIM thresholds and run windows affect the job placement advice of LIM. Job
placement advice is not enforced by LIM.
The RUNWINDOW parameter defined in
lsf.cluster.cluster_name specifies one
or more time windows during which a host is considered available. If the current time is
outside all the defined time windows, the host is considered locked and LIM will not
advise any applications to run jobs on the host.