Porting Scientific and Engineering Programs to Linux
A free collection of routines written in FORTRAN 77 is SLATEC. This collection includes over 1400 mathematical and statistical subroutines that are very well documented with comment lines in a standard format at the head of each piece of source code. In order for this collection to be efficiently used by a work group sharing a workstation, it was found that the creation of a library archive was most appropriate. The more, head, and grep commands with some occasional awking have proven most adequate for finding the subroutine desired and reviewing the documentation integrated in the source code collection.
The SLATEC Version 4.1 library was complied and created using g77 under Linux, and none of the sources required patching. There is one hitch: some of the routines call user supplied subroutines, and therefore, cannot be included in the library. These routines are bvder, bvpor, bvsup, dbvder, dbvpor, dbvsup, dexbvp, drkfab, exbvp and rkfab. The library was created by placing the script in Listing 3 along with all of the .f sources in the directory /usr/local/src/slatec and executing the script.
The resulting library, libslatec.a, is placed in /usr/local/lib and can be accessed at compile time by any user, assuming /usr/local/lib is in their library path, with a command like:
g77 -o somefile somefile.f -lslatec
We have demonstrated that with a little work g77 can be used to compile very significant FORTRAN code packages. With the addition of two simple C routines, g77 was used to compile MCNP, and with no source code modification at all, it compiled the vast mathematical source collection know as SLATEC. g77 has proven to be a FORTRAN compiler that can truly make Linux on Intel hardware, a workstation option for the engineer and scientist, especially one on a budget.
More information about Charles' and Gary's computational endeavors is available at www.csn.net/~ckelsey.
Gary Masters (email@example.com) is a Radiological Engineer at the Rocky Flats Environmental Technology Site. Gary's duties include general health physics, some light number crunching and the care and feeding of the department's UNIX workstations and DEC Alpha database server that runs VMS (yuck). Comments are welcome, and subject to being funneled to /dev/null.
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.
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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