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

[LDM #PPR-218876]: ldm.pq file updating

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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 #PPR-218876]: ldm.pq file updating
  • Date: Mon, 22 Sep 2008 09:12:42 -0600
Justin,

> I did check our system but nothing in cron matches the time intervals
> that this is updating at. If there is insufficent memory for the LDM
> queue to be fully memory mapped how would that behavior show itself? On
> our production super computer we run two cases of LDM on two different
> nodes, both are showing the behavior where the ldm.pq file is updating
> every several minutes. But our backup supercomputer which also running
> two LDMs, both ingesting the same amount of data as production, only
> shows an updated time stamp with the last restart. The production super
> computer is running several other processes which may constrain memory,
> I'm wondering if that would cause ldm.pq to update.

I'm an idiot!  I somehow through you were talking about the pqact(1)
configuration-file, pqact.conf.

The LDM product-queue file, ldm.pq, should be updated every time a
new data-product arrives.  The surprise in your case isn't that
it gets updated, but that it occurs so infrequently (on average,
40 data-products are generated on the IDD every second).  I suspect
that either the operating system is buffering updates to the 
product-queue or that you're receiving a small subset (in terms
of the number of products) from the IDD.

> Justin Cooke


Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: PPR-218876
Department: Support LDM
Priority: Normal
Status: Closed