Message102508
> The counter is "stall cycles".
> During the 10 second run on my 2.4Ghz cpu, we had instruction cache
> miss stalls for 2 billion cycles (2000 samples of 1000000 cycles per
> sample). That does account for around 10% of the availible cpu.
Ok, thanks.
> 2) The poor performance of competing CPU threads on multicore machines
> is due to the instruction cache behaviour of non-overlapping thread
> execution on different cores.
Have you tried your measurement approach with ccbench?
> We can fix 1) easily, even with a much less invasive patch than the
> ones I have put in here. I'm a bit surprised at the apparent
> disinterest in such an obvious bug / fix.
As already said, it's too late for 2.7. And the fix in 3.2 is most
probably better. |
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Date |
User |
Action |
Args |
2010-04-07 00:11:58 | pitrou | set | recipients:
+ pitrou, loewis, beazley, kristjan.jonsson, flox, dabeaz, torsten |
2010-04-07 00:11:56 | pitrou | link | issue8299 messages |
2010-04-07 00:11:55 | pitrou | create | |
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