Are any of you monitoring the power draw on your clusters? If so, can any of
you provide me with some statistics on your power draw under heavy load?
good question; it's something that deserves more attention and coverage.
ATM, I can only provide one non-answer:
http://www.sharcnet.ca/~hahn/saw-power-by-node.png
this is active mixed-user load (45 unrelated users, approximately 85%
CPU utilization due to memory scheduling and job layout constraints).
this an older cluster, HP dual-socket E5440 (2.833G) whose IPMI happens to
return nice power measures.
Ideally, I'm looking for the power load for a worst-case scenario, such as
running HPL, on a per-rack basis.
I don't understand the "per-rack" part - aren't you interested in per-node?
I have some numbers from a friend who lurks on this list, but the more data
points I have, the better I can justify my power requirements for a new
cluster purchase I'm working on.
my experience is that vendors are useless in this regard: they always want
to quote the PSU max rating, and then often don't even use the number right.
(ie, put all the low-dissipation stuff like networking together, etc.)
has anyone tried to rate the accuracy of vendor power calculators?
at least a few years ago, they were absurdly inflated.
regards, mark hahn.
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