HP XC System 3.x Software - Manual (Page 45)

4.3 Examining Nodes and Partitions Before Running Jobs
Before launching an application, you can determine the availability and status of the system's
nodes and partitions. Node and partition information is useful to have before launching a job so
that you can launch the job to properly match the resources that are available on the system.
When invoked with no options, the SLURM sinfo command returns information about node
availability and partitions, along with other information:
$ sinfo
PARTITION AVAIL TIMELIMIT NODES STATE NODELIST
lsf up infinite 4 down* n[12-15]
slurm* up infinite 2 idle n[10-11]
The previous sinfo output shows that there are two partitions on the system:
• One for LSF jobs
• One for SLURM jobs
The asterisk in the PARTITION column indicates the default partition. An asterisk in the STATE
column indicates nodes that are currently not responding.
See Chapter 9 “Using SLURM” for information about using the sinfo command. The SLURM
sinfo manpage also provides detailed information about the sinfo command.
4.4 Interrupting a Job
A job launched by the srun command can be interrupted by sending a signal to the command
by issuing one or more Ctrl/C key sequences. Signals sent to the srun command are
automatically forwarded to the tasks that it is controlling.
The Ctrl/C key sequence will report the state of all tasks associated with the srun command.
If the Ctrl/C key sequence is entered twice within one second, the associated SIGINT signal
will be sent to all tasks. If a third Ctrl/C key sequence is entered, the job will be terminated
without waiting for remote tasks to exit.
The Ctrl/Z key sequence is ignored.
4.5 Setting Debugging Options
In general, the debugging information for your application that is needed by most debuggers
can be produced by supplying the -g switch to the compiler. For more specific information about
debugging options, see the documentation and manpages associated with your compiler.
4.6 Developing Serial Applications
This section describes how to build and run serial application s in the HP XC environment. The
following topics are covered:
• “Serial Application Build Environment” (page 46) describes the serial application
programming model.
• “Building Serial Applications” (page 46) discusses how to build serial applications.
For further information about developing serial applications, see the following sections:
• “Debugging Serial Applications” (page 67) describes how to debug serial applications.
• “Launching Jobs with the srun Command” (page 91) describes how to launch applications
with the srun command.
• “Building and Running a Serial Application” (page 125) provides examples of serial
applications.
4.3 Examining Nodes and Partitions Before Running Jobs 45