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Re: troubles stopping ldm with ldmadmin on linux

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  • Subject: Re: troubles stopping ldm with ldmadmin on linux
  • Date: Wed, 17 May 2000 17:46:34 -0600 (MDT)
David,

Are you talking about the _MAPRGNS flag being set? I changed the configure
to set the flag for all Linux compiles.

Robb...



On Wed, 17 May 2000, David Wojtowicz wrote:

> On Wed, 17 May 2000, D. J. Raymond wrote:
> 
> > I also see this on my Debian Linux box.  I suspect that the processes
> >  won't die until some crucial I/O is done -- probably a good thing!
> >  Why it takes longer on Linux than on Solaris, I do not know.  Maybe
> >  it is a matter of writing stuff from virtual memory to disk, which
> >  could take a long time if, say, 50 MB or so of the product queue were
> >  memory mapped.  The time to die is quite variable -- if the ldm has
> >  just been started, the processes die quickly, but if it has been
> >  running for a while, they take longer.
> > 
> 
> It used to do this under Redhat Linux.  If a large product queue was
> being used on a large memory machine and the processes had touched a 
> significant portion of it, you'd have to wait while all those MB where
> flushed back to disk whenever you killed off LDM before the processes
> would actually go away.   In this case you should observe constant
> disk activity until the processes finally exit.  We found a relatively
> simple fix for this under Redhat.  (It selects a different product
> queue flag when configuring for compilation)  Perhaps when compiled
> under other versions of Linux this flag is not set?
> 
> --------------------------------------------------------
>  David Wojtowicz, Research Programmer/Systems Manager
>  Department of Atmospheric Sciences Computer Services
>  University of Illinois at Urbana-Champaign
>  email: address@hidden  phone: (217)333-8390
> --------------------------------------------------------
> 
> 
> 

===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================