LSF Version 7.3 - Administering Platform LSF

Supported Resource Usage Limits and Syntax
548 Administering Platform LSF
OS memory limit
enforcement
OS enforcement usually allows the process to eventually run to completion. LSF
passes mem_limit to the OS, which uses it as a guide for the system scheduler and
memory allocator. The system may allocate more memory to a process if there is a
surplus. When memory is low, the system takes memory from and lowers the
scheduling priority (re-nice) of a process that has exceeded its declared mem_limit.
OS memory limit enforcement is only available on systems that support
RLIMIT_RSS for setrlimit().
The following operating systems do not support the memory limit at the OS level:
◆ Microsoft Windows
◆ Sun Solaris 2.x
Process limit
Sets the limit of the number of processes to process_limit for the whole job. The
default is no limit. Exceeding the limit causes the job to terminate.
Limits the number of concurrent processes that can be part of a job.
If a default process limit is specified, jobs submitted to the queue without a job-level
process limit are killed when the default process limit is reached.
If you specify only one limit, it is the maximum, or hard, process limit. If you specify
two limits, the first one is the default, or soft, process limit, and the second one is
the maximum process limit.
Run time limit
A run time limit is the maximum amount of time a job can run before it is
terminated. It sets the run time limit of a job. The default is no limit. If the
accumulated time the job has spent in the RUN state exceeds this limit, the job is
sent a USR2 signal. If the job does not terminate within 10 minutes after being sent
this signal, it is killed.
With deadline constraint scheduling configured, a run limit also specifies the
amount of time a job is expected to take, and the minimum amount of time that
must be available before a job can be started.
Jobs submitted to a chunk job queue are not chunked if the run limit is greater than
30 minutes.
Format run_limit is in the form [hour:]minute, where minute can be greater than 59. 3.5
hours can either be specified as 3:30 or 210.
Job syntax (bsub) Queue syntax (lsb.queues) Fomat/Default Units
-p process_limit PROCESSLIMIT=[default] maximum integer
Job syntax (bsub) Queue syntax (lsb.queues) Fomat/Default Units
-W run_limit RUNLIMIT=[default] maximum [hours:]minutes[
/host_name |
/host_model]