Re: 19990601: Linux LDM memory problem (fwd)

FYI

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Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
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---------- Forwarded message ----------
Date: Wed, 2 Jun 1999 12:44:58 -0500 (CDT)
From: David Wojtowicz <address@hidden>
To: Robb Kambic <address@hidden>
Subject: Re: 19990601: Linux LDM memory problem (fwd)

On Tue, 1 Jun 1999, Robb Kambic wrote:

> David,
> 
> How about trying not to use a memmapped queue file. Set the environment
> variable NO_MMMAP = 1 .  One would have to do a make distclean and rerun
> configure.  It might be better or worst, It would be interested to find
> out.  Keep me informed.
> 
> Robb...


OK...

 It fixes the caching problem.  LDM stops immediately when
you run ldmadmin stop.   However, it very seriously impacts
performance.... I tried it on the machine ingesting the NMC2
feed and was getting latencies over an hour and missing
many products (presumably they were going out of the queue
on the source end before they could be transmitted).   Switching
back to the mmap version quickly returned latencies
to only seconds.  So, that doesn't look to be an answer.

--david