Re: [condor-users] NEGOTIATOR_INTERVAL not being honored

[Mark Silberstein <marks@xxxxxxxxxxxxxxxxxxxxxxx>]

It seems that negotiator should adapt itself to the environment where it
works. That is, if it is overloaded with resources and schedds - it
should make its negotiation period larger, up to max allowed by the
user, but if it is not - its negotiation period should be as small as
defined  by minimum value. It would significantly improve the QoS in
small pools, without hurting large deployments.
Mark
On Mon, 2003-12-22 at 21:09, Erik Paulson wrote:
> On Sat, Dec 20, 2003 at 12:17:26PM -0800, Jackson, Scott M wrote:
> > 
> > You will notice that it correctly read in the NEGOTIATOR_INTERVAL I set but it is still taking 20 seconds between Negotiation Cycles.
> > 
> > Does anyone have any idea why this is happening and how I can reduce this 20 second delay?
> > 
> 
> It's a hard-coded delay. It's meant as an optimization, actually - if it
> wasn't there, machines could be matched but not have time to update its state,
> and potentially be rematched in the next negotiation cycle. Obviousvly,  
> just counting on a delay still means this can happen, so the startd is 
> prepared to handle multiple matches from a correctness standpoint, but it's 
> much better to not hit it at all, and let the system quiesce a bit before 
> starting another negotiation cycle.
> 
> However, this is actually not the same thing as the NEGOTIATOR_INTERVAL, though
> in practice it makes NEGOTIATOR_INTERVAL a minimum of 20 seconds. It's really
> a "Don't start another negotiation cycle if the last one finished less than
> 20 seconds ago" - so if your NEGOTIATOR_INTERVAL is 30 seconds, but the
> Negotiation cycle takes 30 seconds, Condor will still wait 20 seconds before
> starting another one. Or, if someone runs condor_reschedule or submits a job,
> (both of which start a new negotiation cycle, regardless of what 
> NEGOTIATOR_INTERVAL is set to) it still forces a 20 second delay.
> 
> Most things in Condor are configurable - in fact, we oftentimes think that
> we have too many settings in the config file, so we're a bit loathe to
> add a knob to adjust this setting. If people really want us to, we'd
> probably be willing to. (In general, we love feature requests, and there's
> nothing more fun in Condor than coding in things we heard about in a
> condor-admin or condor-users message). 
> 
> If you've got the source, it's trivial to remove - it's line
> 453 of src/condor_negotiator.V6/matchmaker.C - just comment out the block that
> starts:
> if ( elapsed < 20 ) {
> 
> 
> -Erik
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