Command Reference Guide

Platform LSF Command Reference 197
◆ A resource usage section (rusage). The resource usage section specifies the
expected resource consumption of the task.
◆ A job spanning section (span). The job spanning section indicates if a parallel
batch job should span across multiple hosts.
◆ A same resource section (same). The same section indicates that all processes
of a parallel job must run on the same type of host.
The resource requirement string sections have the following syntax:
select[selection_string] order[order_string] rusage[usage_string
[, usage_string][|| usage_string] ...] span[span_string]
same[same_string]
The square brackets must be typed as shown for each section.
If
select keyword and square brackets are omitted from the selection string, then
the entire string is treated as a selection string (
select[selection_string]). A
selection string that omits the
select keyword must be the first string in the
resource requirement string.
When LSF_STRICT_RESREQ=Y in
lsf.conf, LSF rejects resource requirement
strings where an rusage section contains a non-consumable resource.
Any resource for run queue length, such as
r15s, r1m or r15m, specified in the
resource requirements refers to the normalized run queue length.
By default, memory (
mem) and swap (swp) limits in select[] and rusage[]
sections are specified in MB. Use LSF_UNIT_FOR_LIMITS in
lsf.conf to specify
a larger unit for the these limits (MB, GB, TB, PB, or EB).
For example, to submit a job that runs on Solaris 7 or Solaris 8:
bsub -R "sol7 || sol8" myjob
The following command runs the job called myjob on an HP-UX host that is lightly
loaded (CPU utilization) and has at least 15 MB of swap memory available.
bsub -R "swp > 15 && hpux order[ut]" myjob
bsub
also accepts multiple -R options for the order, same, rusage, and select
sections. You can specify multiple strings instead of using the
&& operator:
bsub -R "select[swp > 15]" -R "select[hpux] order[r15m]" -R
rusage[mem=100]" -R "order[ut]" -R "same[type]" -R
rusage[tmp=50:duration=60]" -R "same[model]" myjob
LSF merges the multiple -R options into one string and selects a host that meets all
of the resource requirements. The number of
-R option sections is unlimited, up to
a maximum of 512 characters for the entire string.
REMEMBER: Use multiple -R options only with the order, same, rusage, and select sections of the
resource requirements string and with the bsub and bmod commands.
You defined a resource called bigmem in lsf.shared and defined it as an exclusive
resource for
hostE in lsf.cluster.mycluster. Use the following command to
submit a job that runs on
hostE:
bsub -R "bigmem" myjob
or
bsub -R "defined(bigmem)" myjob