Rene Herman wrote:
On 12-12-07 01:09, Alejandro Riveira Fernández wrote:
On my AMD 3800 X2 (2000MHz) ULi M1697 2.6.24-rc5 i get:
cycles: out 1844674407370808, in 1844674407369087
It is not constant but variations are not significant afaics
Eh, oh, I guess you need to compile as a 32-bit binary...
I tried without -O2 as Nigel Cunningham...
cycles: out 1562, in 865
cycles: out 1562, in 866
cycles: out 1555, in 858
cycles: out 1562, in 866
With -m32 -O2
cycles: out 1566, in 876
cycles: out 1555, in 865
cycles: out 1594, in 931
cycles: out 1559, in 874
Great, thanks much for reporting. Sort of interesting in itself that
without -O2 you do still get correct results on 64-bit but for some
other time.
You're the first one to go significantly below 1 us it seems.
Make sure the CPU is actually running at full frequency.
It probably would have been better to have used gettimeofday() around a
sufficiently big loop, so that we would have gotten wall time rather
than cycles.
-hpa
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