Normalized CPU time

The CPU time limit is normalized according to the CPU factor of the submission host and execution host. The CPU limit is scaled so that the job does approximately the same amount of processing for a given CPU limit, even if it is sent to a host with a faster or slower CPU.

For example, if a job is submitted from a host with a CPU factor of 2 and executed on a host with a CPU factor of 3, the CPU time limit is multiplied by 2/3 because the execution host can do the same amount of work as the submission host in 2/3 of the time.

If the optional host name or host model is not given, the CPU limit is scaled based on the DEFAULT_HOST_SPEC value specified in the lsb.params file. If the DEFAULT_HOST_SPEC parameter is not defined, the fastest batch host in the cluster is used as the default. If host or host model is given, its CPU scaling factor is used to adjust the actual CPU time limit at the execution host.

The following example specifies that myjob can run for 10 minutes on a DEC3000 host, or the corresponding time on any other host:

bsub -c 10/DEC3000 myjob