[Buildbot-devel] Lock question: Multiple builders, load-balanced slaves

Scott Lamb slamb at slamb.org
Thu Nov 2 23:38:14 UTC 2006

On Nov 1, 2006, at 7:01 PM, Roy S. Rapoport wrote:
> Imagine this situation:
> 1. There are two slaves for a given os/hardware;
> 2. There are four builders that want to use these two slaves;
> 3. Each slave can only have one build happening at any given point
> I'm trying to figure out how to use interlocks to make this the  
> case.  This
> wasn't a problem for me until now, because I wasn't load-balancing  
> across
> slaves -- so I just created a lock for each slave and had each  
> builder who
> wanted to use that slave try to acquire the lock.
> Now, the problem is that even though the lock is a SlaveLock, its  
> actual
> usage is in the builder.

I'm not sure what you mean by this.

>   So if we have machines MA,MB and builders
> BA,BB,BC,BD, assuming interlock LA,LB, if all builders want to  
> acquire both
> LA and LB, that means I'm serializing all the builders.  That's wrong,
> though -- theoretically, I should be able to have two builds  
> happening in
> parallel, one on each system.

The same SlaveLock can be held on each slave simultaneously, which is  
what you want. It is for per-slave resources.

>   Even using buildbot 0.7.5's lock
> implementation where you can specify how many builders can acquire  
> a given
> lock wouldn't help me, because that doesn't seem to tell buildbot  
> "you can
> build on both these systems at the same time, but not more than one  
> builder
> per system."

I think you're thinking of MasterLock.

> Suggestions? I'm trying to solve the problem where one of our  
> platforms
> ends its nightlies at 08:50, and we're thinking load-balancing will  
> help us
> do this in a robust way.
> -roy
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Scott Lamb <http://www.slamb.org/>

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