On Mon, 4 Jun 2007, David Mathog wrote:
Athcool does cut the idle temperatures of the nodes considerably, but apparently also prevents them from performing this sort of transfer at full speed, whether or not buffer is used.
Well, near the top of the athcool website there is a warning and one the listed items is 'a slowdown in harddisk performance' - so nothing new here ;-)
Which is interesting because it didn't have any measurable effect on CPU bound processes. I had thought it would shut itself off and get out of the way when the CPU rate was high, but apparently not.
CPU bound and I/O bound processes use the processor in different ways... When doing only I/O, the processor is often waiting for the hardware, so the load on the processor is low.
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