LSF Version 7.3 - Using Platform LSF HPC

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and lsgrun unless the user is either an LSF administrator or root. LSF_ROOT_REX

must be defined for remote execution by root. Other remote execution commands, such

ch and lsmake are not affected.

By default, LSF creates a temporary directory for a job only on the first execution host.

If LSF_TMPDIR is set in

lsf.conf, the path of the job temporary directory on the

first execution host is set to

LSF_TMPDIR/

job_ID

.tmpdir.

If LSB_SET_TMPDIR= Y, the environment variable TMPDIR will be set equal to the

path specified by LSF_TMPDIR. This value for TMPDIR overrides any value that

might be set in the submission environment.

Tasks launched through the

blaunch distributed application framework make use of

the LSF temporary directory specified by LSF_TMPDIR:

◆

When the environment variable TMPDIR is set on the first execution host, the

blaunch framework propagates this environment variable to all execution hosts

when launching remote tasks

◆

The job RES or the task RES creates the directory specified by TMPDIR if it does

not already exist before starting the job

◆

The directory created by the job RES or task RES has permission 0700 and is owned

by the execution user

◆

If the TMPDIR directory was created by the task RES, LSF deletes the temporary

directory and its contents when the task is complete

◆

If the TMPDIR directory was created by the job RES, LSF will delete the temporary

directory and its contents when the job is done

◆

If the TMPDIR directory is on a shared file system, it is assumed to be shared by all

the hosts allocated to the

blaunch job, so LSF does not remove TMPDIR

directories created by the job RES or task RES

Automatic generation of the job host file

LSF automatically places the allocated hosts for a job into the $LSB_HOSTS and

$LSB_MCPU_HOSTS environment variables. Since most MPI implementations and

parallel applications expect to read the allocated hosts from a file, LSF creates a host file

in the the default job output directory

$HOME/.lsbatch on the execution host before

the job runs, and deletes it after the job has finished running. The name of the host file

created has the format:

.lsb.<

jobID

>.hostfile

The host file contains one host per line. For example, if LSB_MCPU_HOSTS="hostA

2 hostB 2 hostC 1"

, the host file contains:

hostA

hostB

hostC

LSF publishes the full path to the host file by setting the environment variable

LSB_DJOB_HOSTFILE.