LSF Version 7.3 - Using Platform LSF HPC

If you define the external scheduler option CPUSET[CPUSET_TYPE=none], no
cpusets are allocated and the job is dispatched and run outside of any cpuset.
After dynamic cpusets are allocated and before the job starts running LSF sets the
LSB_HOST_CPUSETS environment variable. LSB_HOST_CPUSETS has the
following format:
number_hosts host1_name cpuset1_name host2_name
cpuset2_name ...
For example, if hostA and hostB have 2 CPUs, and hostC has 4 CPUs, cpuset 1-0 is
created on
hostA, hostB and hostC, and LSB_HOST_CPUSETS set to:
3 hostA 1-0 hostB 1-0 hostC 1-0
LSB_HOST_CPUSETS is only set for jobs that allocate dynamic cpusets.
When a static or dynamic cpuset is allocated, LSF sets the
LSB_CPUSET_DEDICATED environment variable. For
CPUSET_TYPE=none,
LSB_CPUSET_DEDICATED is not set.
The LSB_CPUSET_DEDICATED variable is set by LSF as follows:
◆ For CPUSET_TYPE=dynamic cpusets, LSB_CPUSET_DEDICATED=YES.
This implies MPI_DISTRIBUTE=ON to get good NUMA placement in MPI jobs.
The cpusets assigned to this job are not intended to be shared with other jobs or
other users.
◆ For CPUSET_TYPE=static cpusets, LSB_CPUSET_DEDICATED=NO.
Static cpusets are typically used to run a number of jobs concurrently. The cpusets
assigned to this job are intended to be shared with other jobs, or it is unknown
whether the cpusets assigned are intended to be shared.
How cpuset jobs are suspended and resumed
When a cpuset job is suspended (for example, with bstop), job processes are moved out
of the cpuset and the job cpuset is destroyed. Platform LSF keeps track of which
processes belong to the cpuset, and attempts to recreate a job cpuset when a job is
resumed, and binds the job processes to the cpuset.
When a job is resumed, regardless of how it was suspended, the RESUME_OPTION
is honored. If RESUME_OPTION=ORIG_CPUS then LSF first tries to get the
original CPUs from the same nodes as the original cpuset in order to use the same
memory. If this does not get enough CPUs to resume the job, LSF tries to get any CPUs
in an effort to get the job resumed.
SGI Altix Linux ProPack 5