Re: [ldm-users] Set resource limits on LDM?

  • To: "Patrick L. Francis" <wxprofessor@xxxxxxxxx>
  • Subject: Re: [ldm-users] Set resource limits on LDM?
  • From: Adam DeConinck <adam@xxxxxxxxx>
  • Date: Tue, 20 Mar 2012 15:36:48 -0500
Thanks all for the quick replies!

We seem to be recovered for the moment, and will be revisiting our
queue configuration. We may also be imposing limits using ulimit after
a quick review, but I was trying to determine if LDM had any built-in
throttling mechanism available.  I always prefer to let the
application limit itself if possible before letting the OS beat on it.

We also found the following thread that has potentially useful things
to say about this type of issue:
 I will have to determine from the users of the data whether limiting
the amount of the backlog to download, with -o, is acceptable from
their perspective.

Thanks again,

On Tue, Mar 20, 2012 at 3:24 PM, Patrick L. Francis
<wxprofessor@xxxxxxxxx> wrote:
> reduce the size of your product queue, delete and
> rebuild your queue, then adjust ldmd.conf to only
> one feed such as IDS-DDSPLUS to diagnose issues...
> setting limits should not be needed, but if you feel
> strongly about it you might want to google 'ulimit'
> cheers,
> --patrick
>> Hi all,
>> We're currently attempting to diagnose a problem on an LDM node which
>> we believe has a major backlog of data to download.  When we attempt
>> to start LDM, it quickly takes over all available memory and the load
>> skyrockets, until the server chokes and dies.  Server has 8 cores and
>> 32 GB memory, and 8 GB swap.  As of right now, the load is over 600
>> and nearly all memory is in use.
>> We are not sure exactly what the cause of this issue is in LDM... only
>> that as soon as we start LDM, the load goes through the roof.
>> This issue occurred once before, which we solved with a memory upgrade
>> 8GB->32 GB. Now it's happening again with more memory. :P
>> LDM version is 6.8.1.
>> Can anyone suggest a way to instruct LDM to rate-limit itself, or
>> otherwise set a resource limit so it doesn't murder the server it's
>> on?
>> Thanks,
>> Adam

Adam DeConinck
Systems Application Engineer, R-HPC
Office - 217.954.1056 - Mobile - 347.709.2326
Email/GTalk - adam@xxxxxxxxx - Skype -  ajdecon

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