Gnu Queue: Linux Clustering Made Easy
Here are some simple examples:
> queue -i -w -n -- hostname<\n> > queue -i -r -n -- hostname
For a more sophisticated example, try suspending and resuming it with Control-Z and fg:
> queue -i -w -p -- emacs -nwIf this example works on the localhost, you will want to add additional hosts to the host access control list in share (or --datadir) and start up queued on these.
> queue -i -w -p -h hostname -- emacs -nw
will run Emacs on host name. Without the -h argument, it will run the job on the best or least-loaded host in the Access Control List file. There is also a -H hostname option, which causes hostname to be preferred, but the job will run on other hosts if hostname is unavailable.
At this point, you might be wondering what some of the other options for queue do. ./queue --help gives a list of options to Queue. The “--” separates GNU Queue options from the options to be given to the command to be run. -i stands for immediate; it places the job to be run in the “now” batch queue. -w invokes the proxy job system, as opposed to -r, which causes output to be returned to the user via e-mail (traditional batch processing mode). -n turns off virtual terminal support. Most users will probably only use -i -w -p (full virtual terminal support, for interactive jobs like Emacs) and -i w -n (no virtual terminal support, for noninteractive jobs).
More details on the protocol GNU Queue uses for host selection can be found in the on-line manual and the on-line Internet draft protocol at http://www.gnuqueue.org/.
You can also create additional queues for use with the -q and -d spooldir options. They might be used to specify different queuing behavior for different classes of jobs. Each spooldir must have a profile associated with it. The profile determines queuing behavior for jobs running in that spooldir. See the on-line manual for more details.
That's all there is to it! Of course, for GNU Queue to work well there needs to be some sort of file sharing between nodes in the cluster (for example, NFS, the Network File System). If you have the same home directory, regardless of which machine you log into, your system administrator has somehow configured your home directory to be shared across all cluster nodes. You want to make sure that enough of the file system is shared (i.e., is the same) between cluster nodes so that your programs don't get confused when they run. Typically, you'll want system temporary directories (/tmp and /usr/tmp) to be non-shared, but everything else (except maybe the root file system containing kernel images and basic commands) to be shared. Because this configuration is so common to UNIX and Linux clusters, we've assumed here that this is the case, but it isn't necessarily so; so check with your system administrator if you have questions about how files are shared across your network cluster.
Documentation about GNU Queue is also available off the web site, including an Internet draft on the protocol GNU Queue uses to farm out jobs. While you're there, you'll probably want to sign up for one of the three mailing lists (queue-announce, queue-developers and queue-support) so that you can learn of new features as they're announced and interact with other GNU Queue users. At the time of writing, queue-developers is by far the most active list, with lively discussion of improvements to GNU Queue's many features and suggested ports to new platforms. You can obtain advice for any problems you encounter from the queue-support mailing list.
Another SourceForge feature mentioned on the home page is the CVS repository for GNU Queue. Interested readers can obtain the latest prerelease development code, containing the latest features (and bugs) as they are added by developers, by unpacking the GNU Queue distribution and running the command cvs update inside the top-level directory. If you're actively making changes to GNU Queue, you can apply for write access to the CVS directory and instantly publish your changes via the cvs ci command. If you can get other developers interested in your work (via the queue-developers mailing list, of course), you can bounce code changes back and forth amongst yourselves via repeated cycles of cvs, ci and cvs update. All of this assumes you have cvs installed, which is the default with many Linux distributions.
Code isn't the only way interested readers can contribute to GNU Queue. There are many ways to contribute to the GNU Queue effort on SourceForge. With a login on SourceForge, one of the project administrators can give you editor privileges for the documentation tree, moderator privileges in the discussion forums, or administrative privileges in the bug tracking and patch database sections of the site.
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