[Beowulf] backtraces

Gerry Creager gerry.creager at tamu.edu
Tue Jun 12 05:11:57 PDT 2007

Greg Lindahl wrote:
> On Mon, Jun 11, 2007 at 11:55:02PM -0500, Gerry Creager wrote:
>> And how do you support my operational requirements with this policy 
>> during hurricane season?
> By not over-generalizing from a general policy to a place where it
> doesn't apply? Craig has worked in weather forecasting, you know.

Actually, the tone sounded like it was already over-generalized.  I 
merely followed the trend.

> You don't run your ensemble elements as separate jobs? Isn't that
> asking for disaster if something goes wrong?

Actually, it depends on what you call a "job".  Apparently IBM's 
LoadLeveler (hardly a Beowulf implementation, but what I'm working with 
right now) thinks that the job-file defines the job.  I can check-point, 
sleep or do quite a bit more within the normal job script but IBM wants 
to treat that as a "job".  Most of my runs on that machine complete in a 
couple of clock hours for a single ensemble member, or less.  The job, 
however, can take 8-12 hours with WRF, Holland winds, ADCIRC, WaveWatch, 
SWAN and ELCIRC in ensemble mode.

Some of my WRF climate runs can go for days, however.  Those are cycle hogs.

Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843

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