[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[LDM #XKS-398652]: request for enlightenment

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [LDM #XKS-398652]: request for enlightenment
  • Date: Mon, 29 Sep 2014 14:03:22 -0600
Steve,

> I'm in need of a little LDM enlightenment and hope you can provide it!

I'll try.

> We've recently installed the latest ldm 6.12.6 with the noaaport option.
> 
> We've got a 2GB queue and have started ldmd with -m 3600 -o 3600 command
> line options. Our pqmon stats currently look like this (sorry for the
> wrapping):
> 
> Sep 26 19:53:38 pqmon NOTE: nprods nfree  nempty      nbytes  maxprods
> maxfree  minempty    maxext  age
> Sep 26 19:53:43 pqmon NOTE:  39016     3       0  1176418736     39018
> 8         0 803106848 873
> 
> I'm confused. We're allowing up to 3600 secs of products, but the oldest
> product is only 873 secs.

Not quite. The "-m 3600" option specifies that the maximum allowable latency is 
one hour (products created earlier than this will not be put in the 
product-queue). The "-o 3600" option specifies that REQUEST entries in the LDM 
configuration-file will use a time-offset of one hour (i.e., they'll request 
data starting at one hour old).

> Our queue is 2 GB, but only 1176418736 bytes
> is being used?

Correct. Your queue only has slots available for 39019 data-products. Thus, 
your queue is slot-limited rather than space-limited.

> So, we have approximately .8 GB not being used, but we're
> nowhere near the 3600 sec oldest product? Can you explain what I'm
> seeing here? Any enlightenment you can give would be greatly
> appreciated!
> 
> On a somewhat related subject, our LDM is on a 32 bit operating system
> currently. It's on-the-list to upgrade to a 64 bit OS. Is it a "bad
> thing" to have a queue larger than 2 GB on a 32 bit OS? And what is the
> recommended queue size for a NOAAPort based machine getting all 5
> channels?

I'm not an expert on the hardware specifications. I'll see about getting one to 
answer this question.

> Steve
> 
> --
> ----------------------------------------------------------------
> Stephen D. Adams
> Vice President - Research and Development
> AWIS Weather Services, Inc.
> 1735 East University Drive, Suite 101
> Auburn, AL 36830-5204
> 
> Website: http://www.awis.com
> Facebook: https://www.facebook.com/AWISWeatherServices
> email: address@hidden
> Phone: (334) xxx-xxx ext xxxx
> Toll-free: (888) xxx-xxx ext xxxx
> Toll-free Fax: (888) xxx-xxxx
> ----------------------------------------------------------------

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: XKS-398652
Department: Support LDM
Priority: Normal
Status: Closed