Administering Platform LSF - SAS

CPU Time and Run Time Normalization
Normalization host
Chapter 26
Runtime Resource Usage Limits
To set the CPU time limit and run time limit for jobs in a platform-independent
way, LSF scales the limits by the CPU factor of the hosts involved. When a job
is dispatched to a host for execution, the limits are then normalized according
to the CPU factor of the execution host.
Whenever a normalized CPU time or run time is given, the actual time on the
execution host is the specified time multiplied by the CPU factor of the
normalization host then divided by the CPU factor of the execution host.
If ABS_RUNLIMIT=Y is defined in lsb.params, the run time limit is not
normalized by the host CPU factor. Absolute wall-clock run time is used for all
jobs submitted with a run limit.
If no host or host model is given with the CPU time or run time, LSF uses the
default CPU time normalization host defined at the queue level
(DEFAULT_HOST_SPEC in lsb.queues) if it has been configured, otherwise
uses the default CPU time normalization host defined at the cluster level
(DEFAULT_HOST_SPEC in lsb.params) if it has been configured, otherwise
uses the submission host.
Example
CPULIMIT=10/hostA
If hostA has a CPU factor of 2, and hostB has a CPU factor of 1 (hostB is
slower than hostA), this specifies an actual time limit of 10 minutes on hostA,
or on any other host that has a CPU factor of 2. However, if hostB is the
execution host, the actual time limit on hostB is 20 minutes (10 * 2 / 1).
Normalization hosts for default CPU and run time limits
The first valid CPU factor encountered is used for both CPU limit and run time
limit. To be valid, a host specification must be a valid host name that is a
member of the LSF cluster. The CPU factor is used even if the specified limit is
not valid.
If the CPU and run limit have different host specifications, the CPU limit host
specification is enforced.
If no host or host model is given with the CPU or run time limits, LSF
determines the default normalization host according to the following priority:
1 DEFAULT_HOST_SPEC is configured in lsb.queues
2 DEFAULT_HOST_SPEC is configured in lsb.params
3 If DEFAULT_HOST_SPEC is not configured in lsb.queues or
lsb.params, host with the largest CPU factor is used.
CPU time display (bacct, bhist, bqueues)
Normalized CPU time is displayed in the output of bqueues. CPU time is not
normalized in the output if bacct and bhist.
Administering Platform LSF 357