On the "spool RAM to disk" idea - That's sort of like checkpointing, and it can
take surprisingly long, so there's another tradeoff there.
Not really, especially not with NVMe disk drives. I have NVMe drives in
both my laptop and my desktop, and it startling how fast they boot and
resume from suspend with NVMe disks.
I think the bigger issue with this approach is if enterprise servers
would support this. I believe there has to be some level of hardware
support for this, which I doubt servers designed for constant-on use
have. Someone please jump in and correct me if I'm wrong here.
Prentice
On 7/16/21 8:38 PM, Lux, Jim (US 7140) via Beowulf wrote:
An interesting question.
The power cycling reliability thing is probably not a big deal - the temperatures change
a lot between light load and heavy load already, and if a "server class" PC
can't take a power cycle per day, when the grungiest consumer unit can do it, I'd be
surprised. It's not like you're cycling between -40C and 70C every hour like in an
automotive application.
Managing the chillers, though - That might be a bigger problem.
And as Jörg points out, there's a fair amount of sophistication needed in
setting your turn on and turn off thresholds.
On the "spool RAM to disk" idea - That's sort of like checkpointing, and it can
take surprisingly long, so there's another tradeoff there.
On 7/16/21, 12:35 PM, "Beowulf on behalf of Douglas Eadline"
<beowulf-boun...@beowulf.org on behalf of deadl...@eadline.org> wrote:
Hi everyone:
Reducing power use has become an important topic. One
of the questions I always wondered about is
why more cluster do not turn off unused nodes. Slurm
has hooks to turn nodes off when not in use and
turn them on when resources are needed.
My understanding is that power cycling creates
temperature cycling, that then leads to premature node
failure. Makes sense and has anyone ever studied/tested
this ?
The only other reason I can think of is that the delay
in server boot time makes job starts slow or power
surge issues.
I'm curious about other ideas or experiences.
Thanks
--
Doug
--
Doug
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