Re: [HTCondor-users] scheduling behavior

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 5/2/2018 3:53 PM, Marcus Ebert wrote:
> Hello,
> 
> We have a condor 8.6 installation with about 4000 jobs slots. Most of 
> these are on 8-core VMs. When there are free slots available, the 
> scheduling of idle jobs to a specific machine seems somehow random.
> What we would like to have is that HTCondor fills up all slots on a 
> machine before sending jobs to another (empty) machine.
> 
> Is there any config option that would allow to change the scheduling 
> behavior in that way (something like a node allocation policy in Maui)?
> 

Hi Marcus,

Are you using static slots (the default) or partitionable slots on your pool?

If you are using static slots, the default configuration should already prefer filling up a machine before using another machine.

If you are using partitionable slots, and you are running HTCondor v8.6.x or later, I suggest you append the following into the condor_config[.local] on your central manager and then do a condor_reconfig:

    # If using partitionable slots, fill depth first.  See http://tinyurl.com/y75k3k7p
    NEGOTIATOR_DEPTH_FIRST = True

Hope the above helps,
Todd