pbsB - Online in the Cloud

PROGRAM:

NAME

pbs - general information on pbs

DESCRIPTION

PBS stands for Portable Batch System. It is a networked subsystem for submitting,
monitoring, and controlling a work load of batch jobs on one or more systems. More
information about PBS is available in the PBS Users Guide.

Batch means that the job will be scheduled for execution at a time chosen by the subsystem
according to a defined policy and the availability of resources. For a normal batch job,
the standard output and standard error of the job will be returned to files available to
the user when the job is complete. This differs from an interactive session where
commands are executed when entered via the terminal and output is returned directly to the
terminal. PBS also supports an interactive batch mode where the input and output is
connected to the user's terminal, but the scheduling of the job is still under control of
the batch system.

A job is typically a shell script and a set of attributes which provide resource and
control information about the job. A job does not have to be submitted on the system
where it will run, tt can be submitted on any system with the PBS commands and access to
the execution system, see qsub(1B). Output will be returned to the system from which the
job was submitted unless directed otherwise.

Attributes offer control over when a job is eligible to be run, what happens to the output
when it is completed and how the user is notified when it completes. The attributes of
the job may be specified on the command line or in the job script when the job is
submitted. For information about job attributes, see qsub(1B) and pbs_job_attributes(7B).

One important attribute is the resource list. The list specifies the amount and type of
resources needed by the job in order to execute. The list also implies a hard upper
limit on usage of those resources. When the limit is reached, the job is terminated. The
types of resources available to a job vary with the system architecture. For a list of
resources supported on the default system, see pbs_resources(7B). There are man pages for
other systems types as well, see pbs_resources_aix4(7B), pbs_resources_fujitsu(7B),
pbs_resources_irix5(7B), pbs_resources_solaris5(7B), pbs_resources_sp2(7B),
pbs_resources_sunos4(7B), or pbs_resources_unicos8(7B).

Once a job has been submitted, it may be monitored by use of the qstat(1B) command. Two
forms of output are available with the qstat command. The default form is the short
display. Information about a job is limited to a single line. Complete information
about the job or jobs is available through qstat with the -f option. Information will be
given about all jobs in the system, all jobs in specified queues, or only specified jobs.

When displaying status of jobs, you will see in which queue the job resides. In PBS a
queue is just a collection point for jobs, it does not imply any execution ordering. That
ordering is determined by a scheduling policy implemented by the system administration.

Other commands of interest which have man pages of their own are:

qalter Alter a job's attributes.

qdel Delete a job.

qhold Place a hold on a job to keep it from being scheduled for running.

qmove Move a job to a different queue or server.

qmsg Append a message to the output of an executing job.

qrerun Terminate an executing job and return it to a queue.

qrls Remove a hold from a job.

qselect Obtain a list of jobs that met certain criteria.

qsig Send a signal to an executing job.

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