On 02/24/2010 03:52 PM, Andrew Morton wrote:
On Wed, 24 Feb 2010 15:28:44 -0500 Rik van Riel<riel@xxxxxxxxxx> wrote:
Generally it seems like a bad idea to do this sort of thing
asynchronously. Because it reduces repeatability across runs and
across machines - system behaviour becomes more dependent on the size
of the machine and the amount of activity in unrelated jobs?
Isn't system performance already dependent on the size of
the machine and the amount of activity in unrelated jobs?
I said "repeatability".
Using hugepages is a performance enhancement only and
otherwise transparent to userspace.
And it's bad that a job run will take a varying amount of CPU time due
to unrelated activity. Yes, that can already happen, but it's
undesirable and it's undesirable to worsen things.
If this work could be done synchronously then runtimes become more
consistent, which is a good thing.
Only if it means run times become shorter...
I would argue that running consistently slower would
be worse than running inconsitently faster, but maybe
that's just me :)
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