Platform LSF Reference Version 6.2

HostModel Section
Platform LSF Reference
602
HostModel Section
(Required) Lists models of machines and gives the relative CPU scaling factor for each
model. All hosts of the same relative speed are assigned the same host model.
LSF uses the relative CPU scaling factor to normalize the CPU load indices so that jobs
are more likely to be sent to faster hosts. The CPU factor affects the calculation of job
execution time limits and accounting. Using large or inaccurate values for the CPU
factor can cause confusing results when CPU time limits or accounting are used.
HostModel section structure
The first line consists of the mandatory keywords MODELNAME, CPUFACTOR, and
ARCHITECTURE.
Subsequent lines define a model and its CPU factor.
Example HostModel section
Begin HostModel
MODELNAME CPUFACTOR ARCHITECTURE
PC400 13.0 (i86pc_400 i686_400)
PC450 13.2 (i86pc_450 i686_450)
Sparc5F 3.0 (SUNWSPARCstation5_170_sparc)
Sparc20 4.7 (SUNWSPARCstation20_151_sparc)
Ultra5S 10.3 (SUNWUltra5_270_sparcv9 SUNWUltra510_270_sparcv9)
End HostModel
ARCHITECTURE
Description
(Reserved for system use only) Indicates automatically detected host models that
correspond to the model names.
CPUFACTOR
Description
Though it is not required, you would typically assign a CPU factor of 1.0 to the slowest
machine model in your system and higher numbers for the others. For example, for a
machine model that executes at twice the speed of your slowest model, a factor of 2.0
should be assigned.
MODELNAME
Description
Generally, you need to identify the distinct host types in your system, such as MIPS and
SPARC first, and then the machine models within each, such as SparcIPC, Sparc1,
Sparc2, and Sparc10.
About automatically detected host models and types
When you first install LSF, you do not necessarily need to assign models and types to
hosts in
lsf.cluster.cluster_name. If you do not assign models and types to hosts
in
lsf.cluster.cluster_name, LIM automatically detects the model and type for the
host.
If you have versions earlier than LSF 4.0, you may have host models and types already
assigned to hosts. You can take advantage of automatic detection of host model and type
also.