[Beowulf] What services do you run on your cluster nodes?
gerry.creager at tamu.edu
Mon Sep 22 17:24:04 EDT 2008
Eric Thibodeau wrote:
> 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.
As a slightly OT question: I've recently heard it posited that ganglia
induces severe communications overhead ("It's chatty") and thus
shouldn't be used. What's the conventional wisdom thereof?
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.862.3982 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
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