MBD_QUERY_CPUS

Syntax

MBD_QUERY_CPUS=cpu_list

cpu_list defines the list of master host CPUS on which the mbatchd child query processes can run. Format the list as a white-space delimited list of CPU numbers.

For example, if you specify

MBD_QUERY_CPUS=1 2 3

the mbatchd child query processes will run only on CPU numbers 1, 2, and 3 on the master host.

Description

This parameter allows you to specify the master host CPUs on which mbatchd child query processes can run (hard CPU affinity). This improves mbatchd scheduling and dispatch performance by binding query processes to specific CPUs so that higher priority mbatchd processes can run more efficiently.

When you define this parameter, LSF runs mbatchd child query processes only on the specified CPUs. The operating system can assign other processes to run on the same CPU; however, if utilization of the bound CPU is lower than utilization of the unbound CPUs.

Important

You can specify CPU affinity only for master hosts that use one of the following operating systems:
- Linux 2.6 or higher
- Solaris 8 or higher
If failover to a master host candidate occurs, LSF maintains the hard CPU affinity, provided that the master host candidate has the same CPU configuration as the original master host. If the configuration differs, LSF ignores the CPU list and reverts to default behavior.

Related parameters

To improve scheduling and dispatch performance of all LSF daemons, you should use MBD_QUERY_CPUS together with EGO_DAEMONS_CPUS (in ego.conf), which controls LIM CPU allocation, and LSF_DAEMONS_CPUS, which binds mbatchd and mbschd daemon processes to specific CPUs so that higher priority daemon processes can run more efficiently. To get best performance, CPU allocation for all four daemons should be assigned their own CPUs. For example, on a 4 CPU SMP host, the following configuration will give the best performance:

EGO_DAEMONS_CPUS=0 LSF_DAEMONS_CPUS=1:2 MBD_QUERY_CPUS=3

Default