1. Introduction

This document provides a brief summary of information that you'll need to know to quickly get started working on Warhawk. For more detailed information, see the Warhwak User Guide.

2. Get a Kerberos Ticket

For security purposes, you must have a current Kerberos ticket on your computer before attempting to connect to Warhawk. A Kerberos client kit must be installed on your desktop to enable you to get a Kerberos ticket. Information about installing Kerberos clients on your Windows desktop can be found at HPC Centers: Kerberos & Authentication.

3. Connect to Warhawk

Warhawk can be accessed via Kerberized ssh as follows:

4. Home, Working, and Center-wide Directories

Each user has file space in the $HOME, $WORKDIR, and $CENTER directories. The $HOME, $WORKDIR, and $CENTER environment variables are predefined for you and point to the appropriate locations in the file systems. You are strongly encouraged to use these variables in your scripts.

NOTE: $WORKDIR is a "scratch" file system, and $CENTER is a center-wide file system that is accessible to all center production machines. Neither of these file systems is backed up. You are responsible for managing files in your $WORKDIR and $CENTER directories by backing up files to the archive system and deleting unneeded files. Currently, $WORKDIR files older than 21 days and $CENTER files older than 120 days are subject to being purged.

If it is determined as part of the normal purge cycle that files in your $WORKDIR directory must be deleted, we will notify you via email 6 days prior to deletion.

5. Transfer Files and Data to Warhawk

File transfers to DSRC systems must be performed using Kerberized versions of the following tools: scp, ftp, sftp, and mpscp. For example, the command below uses secure copy (scp) to copy a local file into a destination directory on a Warhawk login node.

For additional information on file transfers to and from Warhawk, see the File Transfers section of the Warhawk User Guide.

6. Submit Jobs to the Batch Queue

The Portable Batch System (PBS Professional ™) is the workload management system for Warhawk. To submit a batch job, use the following command:

where my_job_script is the name of the file containing your batch script. For more information on using PBS or on job scripts, see the Warhawk User Guide, the Warhawk PBS Guide, or the sample script examples in the $SAMPLES_HOME directory on Warhawk.

7. Batch Queues

The following table describes the PBS queues available on Warhawk:

Queue Descriptions and Limits on Warhawk

Priority	Queue Name	Max Wall Clock Time	Max Cores Per Job	Description
Highest	urgent	168 Hours	69,888	Jobs belonging to DoD HPCMP Urgent Projects
	debug	1 Hour	2,816	User testing
	high	168 Hours	69,888	Jobs belonging to DoD HPCMP High Priority Projects
	frontier	168 Hours	69,888	Jobs belonging to DoD HPCMP Frontier Projects
	standard	168 Hours	69,888	Standard jobs
	HIE	24 Hours	256	Rapid response for interactive work
	transfer	48 Hours	1	Data transfer for user jobs
Lowest	background	120 Hours	2,816	Unrestricted access - no allocation charge

8. Monitoring Your Job

You can monitor your batch jobs on Warhawk using the qpeek, qview, or qstat commands.

The qstat command lists all jobs in the queue. The "-u username" option shows only jobs owned by the given user, as follows:

% qstat -u user1
                                                          Req'd  Req'd    Elap
Job ID          Username Queue     Jobname SessID NDS TSK Memory Time  S  Time
--------------  -------- --------  ------- ------ --- --- ------ ----- -  -----
3403.warhawk-p  user1    debug     mytest  435354   1 128   --   00:30 R  00:12
3404.warhawk-p  user1    frontier  inspect --     100 128   --   06:00 Q   --
3404.warhawk-p  user1    frontier  inspect --     100 128   --   06:00 Q   --

Notice that the output contains the JobID for each job. This ID can be used with the qpeek, qview, qstat, and qdel commands.

To delete a job, use the command "qdel jobID".

To view a partially completed output file, use the "qpeek jobID" command.

9. Archiving Your Work

When your job is finished, you should archive any important data to prevent automatic deletion by the purge scripts.

Copy one or more files to the archive system
archive put [-C path ] [-D] [-s] file1 [file2 ...]

Copy one or more files from the archive system
archive get [-C path ] [-s] file1 [file2 ...]

For more information on archiving your files, see the Archive Guide.

10. Modules

Software modules are a very convenient way to set needed environment variables and include necessary directories in your path so that commands for particular applications can be found. Warhawk uses "modules" to initialize your environment with COTS application software, system commands and libraries, compiler suites, environment variables, and PBS batch system commands.

A number of modules are loaded automatically as soon as you log in. To see the modules that are currently loaded, run "module list". To see the entire list of available modules, run "module avail". You can modify the configuration of your environment by loading and unloading modules. For complete information on how to do this, see the Modules User Guide.

11. Available Software

A list of software on Warhawk is available on the software page.

12. Advance Reservation Service

A subset of Warhawk's nodes has been set aside for use as part of the Advance Reservation Service (ARS). The ARS allows users to reserve a user-designated number of nodes for a specified number of hours starting at a specific date/time. This service enables users to execute interactive or other time-critical jobs within the batch system environment. The ARS is accessible via most modern web browsers at https://reservation.hpc.mil. Authenticated access is required. The ARS User Guide is available on HPC Centers.