You can review the exact code here( see 'slow_job_turnover') :  https://bitbucket.org/galaxy/cloudman/src/7b8f04895ad309e0168cb3de66446ae20f3d8b3e/cm/services/autoscale.py?at=default

But, basically, load on any particular node isn't very useful for autoscaling in this context because most jobs cannot be split among multiple nodes.  What we use is a heristic to determine churn and jobs waiting to run.  Generally speaking, if you have jobs waiting to run for a bit, your cluster should scale.

-Dannon

On Fri, Apr 25, 2014 at 2:37 PM, Jim McCusker <jmccusker@5amsolutions.com> wrote:

What are the exact conditions that will trigger autoscaling in a galaxy/cloudman instance? I'm seeing 100% utilization on the head node but no attempts by cloudman at spinning up new instances. What sort of state is supposed to trigger that?

Thanks,

Jim

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