Administering Platform LSF - SAS

Chapter 13
Specifying Resource Requirements
Specifying multiple usage strings
Use several comma-separated usage strings to define different duration and
decay for any number of resources.
A given load index cannot appear more than once in the resource usage string.
Examples ◆ The following job requests 20 MB memory for the duration of the job, and
1 license for 2 minutes:
% bsub -R "rusage[mem=20, license=1:duration=2]" myjob
◆ A queue with the same resource requirements could specify:
RES_REQ = rusage[mem=20, license=1:duration=2]
◆ The following job requests 20 MB of memory and 50 MB of swap space for
1 hour, and 1 license for 2 minutes:
% bsub -R "rusage[mem=20:swap=50:duration=1h, license=1:duration=2]" myjob
◆ The following job requests 50 MB of swap space, linearly decreasing the
amount reserved over a duration of 2 hours, and requests 1 license for 2
minutes:
% bsub -R "rusage[swp=20:duration=2h:decay=1, license=1:duration=2]" myjob
◆ The following job requests two resources with same duration but different
decay:
% bsub -R "rusage[mem=20:duration=30:decay=1, lic=1:duration=30] myjob
Non-batch environments
Resource reservation is only available for batch jobs. If you run jobs using only
LSF Base, such as through lsrun, LIM uses resource usage to determine the
placement of jobs. Resource usage requests are used to temporarily increase
the load so that a host is not overloaded. When LIM makes a placement advice,
external load indices are not considered in the resource usage string. In this
case, the syntax of the resource usage string is
res[=value]:res[=value]: ... :res[=value]
res is one of the resources whose value is returned by the lsload command.
rusage[r1m=0.5:mem=20:swp=40]
The above example indicates that the task is expected to increase the 1-minute
run queue length by 0.5, consume 20 MB of memory and 40 MB of swap space.
If no value is specified, the task is assumed to be intensive in using that
resource. In this case no more than one task will be assigned to a host
regardless of how many CPUs it has.
The default resource usage for a task is r15s=1.0:r1m=1.0:r15m=1.0. This
indicates a CPU-intensive task which consumes few other resources.
Administering Platform LSF 197