AIPS and Linux: A Historical Reminiscence
In early 1998, as Jeff left for greener pastures (a formerly secretive company called Transmeta), there were two major obstacles left that stood in the way of total world domination by the Intel/Linux platform in the AIPS community. These were file locking on NFS-mounted file systems, and support for files larger than 2GB. With the advent of kernel-based NFS in version 2.2, the first issue is now moot. Jeff wrote the Linux statd, one of the two halves of the statd-lockd pair that governs all NFS file locks mostly at NRAO, partially at Transmeta.
As for the 2GB limit on file size, there is now hope on the horizon on that front, too. With SGI's promised release of their XFS code, it's likely that this journaled file system—which offers large file support in its original Irix environment—will smash this barrier. It should also provide a more robust file system, and hopefully one that won't take quite so long to fsck a 20GB partition.
Before he left, Jeff did contribute to the follow-up project to AIPS, called AIPS++. This large project, now coming to maturity, has fortunately followed in its parent's footsteps by adopting both the General Public License and Intel/Linux as one of its leading platforms.
If you who would like to get your hands on the software, point your browser at NRAO's main page and follow the link to “Software”. Be warned, though: it is not a small package, needs about 400MB of disk space, and has a non-trivial install procedure. It's also most useful if you want to analyze data from the VLA; if you want a simpler program, look at Bill Cotton's FITSView instead.
At many serious astronomy sites, you will find the dominant format of images and data to be FITS, the flexible image transport system. This format was invented around 1980 by a consortium of NRAO and other scientists so they could share data. The popular xv viewer supports the simpler versions of this format.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide