The time after which it culls instances?  It is not, but because of the way Amazon bills for instances, you never want to kill an instance until the end of the hour (since, regardless of when you kill an instance, you're billed for the remainder of the hour).

-Dannon

On Fri, Apr 25, 2014 at 3:01 PM, Jim McCusker <jmccusker@5amsolutions.com> wrote:

Thanks, is the idle time configurable?

On Fri, Apr 25, 2014 at 2:43 PM, Dannon Baker <dannon.baker@gmail.com> wrote:

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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