Administering Platform LSF - SAS

How LSF Uses Resources
Viewing job resource usage
Viewing load on a host
Chapter 8
Understanding 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.
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.
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 me
m
loadSched - - - - - - - - - - -
loadStop - - - - - - - - - - -
Administering Platform LSF 143