Prentice Bisbal wrote:
The more services you run on your cluster node (gmond, sendmail, etc.)
the less performance is available for number crunching, but at the same
time, administration difficulty increases. For example, if you turn off
postfix/sendmail, you'll no longer get automated e-mails from your
system to alert you to a problem.
My question is this: how extreme do you go in disabling non-essential
services on your cluster nodes? Do you turn off *everything* that's not
absolutely necessary, do you leave somethings running to make
administration easier?
Everything is turned off and, most of the time, a quick glance at
ganglia brings out problems. Simple scripts can be built to perform
cyclic checks on the nodes and would be less disruptive IMHO.
I'm curious to see how everyone else has their cluster(s) configured.
The only actual research I found on OS interference impacting HPC
computing is titled "A measurement and simulation methodology for
parallel computing performance studies" by Matthew Joseph Sottile. I
would be curious to know if anyone else has dipped into the subject and
come up with conclusive results on the subject.
Eric
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