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[LDM #PFK-426667]: Load average goes above 10 on weather3.admin.niu.edu running LDM

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  • Subject: [LDM #PFK-426667]: Load average goes above 10 on weather3.admin.niu.edu running LDM
  • Date: Mon, 10 Sep 2012 10:07:15 -0600
Gilbert,

[I'm back from the highland games.]

> > It happened because you had a registry.xml configuration set
> > to 'decrease maximum latency'.  This caused the LDM to automatically
> > resize the queue to increase the queue residency time.  I just
> > edited your registry.xml file and set the configuration to what
> > I always use 'do nothing'.  This will stop the LDM from resizing
> > your queue in the future.  Given the low load averages now, I
> > think that keeping your queue to a fixed size, manageable size
> > is what is called for.

A minor correction: if the registry parameter "/reconciliation-mode" is set to 
"decrease maximum latency", then the time-offset value for requesting data will 
be decreased (e.g., from the default one hour to, say, 30 minutes) in order to 
ensure detection of duplicate data-products. Also, the latency threshold for 
rejecting a data-product will be reduced to this value, again to avoid 
duplicate data-products.

Good work figuring this one out!

> Thanks. Will do that for the others as well.
> 
> > Musing: the problem may have appeared because you keep your
> > LDM queue in shared memory...
> 
> ..and I ran out of memory! :-(
> 
> *******************************************************************************
> Gilbert Sebenste                                                    ********
> (My opinions only!)                                                  ******
> Staff Meteorologist, Northern Illinois University                      ****
> E-mail: address@hidden                                  ***
> web: http://weather.admin.niu.edu                                      **
> Twitter: http://www.twitter.com/NIU_Weather                            **
> Facebook: http://www.facebook.com/niu.weather                           *
> *******************************************************************************


Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: PFK-426667
Department: Support LDM
Priority: Normal
Status: Closed