[Beowulf] What services do you run on your cluster nodes?

Greg Lindahl lindahl at pbm.com
Tue Sep 23 19:54:33 EDT 2008


On Tue, Sep 23, 2008 at 07:43:19PM -0400, Perry E. Metzger wrote:

> As for the daemons, remember that with a proper scheduler, you will
> switch straight from an incoming network interrupt to a high priority
> process that is expecting the incoming packet, and that even works
> correctly on some (but not all) Linux kernels. A user process cannot
> take priority over other tasks, at least not without someone being
> quite deliberate about it.

You realize that most big HPC systems are using interconnects that
don't generate many or any interrupts, right?  It doesn't seem that
you've bothered to read the papers that several people have pointed
you at. Daemons are a significant problem on these tightly-coupled,
non-interrupt-using systems.

-- greg

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