Platform LSF Administration Guide Version 6.2

How LSF Uses Resources
Administering Platform LSF
208
How LSF Uses Resources
Jobs submitted through the LSF system will have the resources they use monitored while
they are running. This information is used to enforce resource usage limits and load
thresholds as well as for fairshare scheduling.
LSF collects information such as:
◆ Total CPU time consumed by all processes in the job
◆ Total resident memory usage in KB of all currently running processes in a job
◆ Total virtual memory usage in KB of all currently running processes in a job
◆ Currently active process group ID in a job
◆ Currently active processes in a job
On UNIX, job-level resource usage is collected through a special process called PIM
(Process Information Manager). PIM is managed internally by LSF.
Viewing job resource usage
The -l option of the bjobs command displays the current resource usage of the job.
The usage information is sampled by PIM every 30 seconds and collected by
sbatchd
at a maximum frequency of every SBD_SLEEP_TIME (configured in the
lsb.params file) and sent to mbatchd. The update is done only if the value for the
CPU time, resident memory usage, or virtual memory usage has changed by more than
10 percent from the previous update, or if a new process or process group has been
created.
Viewing load on a host
Use bhosts -l to check the load levels on the host, and adjust the suspending
conditions of the host or queue if necessary. The
bhosts -l command gives the most
recent load values used for the scheduling of jobs. A dash (
-) in the output indicates that
the particular threshold is not defined.
% bhosts -l hostB
HOST: hostB
STATUS CPUF JL/U MAX NJOBS RUN SSUSP USUSP RSV
ok 20.00 2 2 0 0 0 0 0
CURRENT LOAD USED FOR SCHEDULING:
r15s r1m r15m ut pg io ls t tmp swp mem
Total 0.3 0.8 0.9 61% 3.8 72 26 0 6M 253M 297M
Reserved 0.0 0.0 0.0 0% 0.0 0 0 0 0M 0M 0M
LOAD THRESHOLD USED FOR SCHEDULING:
r15s r1m r15m ut pg io ls it tmp swp mem
loadSched - - - - ----- - -
loadStop - - - - ----- - -