Frank Behrens wrote:
I read this thread with interest and saw the question, how the system
wil behave with hyperthreading. Should I not benchmark my system?
here you have the results. The interpretation is left to the experts.
IMHO HT is not as useless as expected. :-)
I did not switch off SMP with sysctl, but used an extra UP Kernel to
allow some optimizations during compile. But I don't know if there
are any..
Hardware is
CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (2798.66-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf33 Stepping = 3
Hyperthreading: 2 logical CPUs
real memory = 1072889856 (1023 MB)
avail memory = 1040453632 (992 MB)
According to my formula:
time(minutes) = 1e5 / ( speed(MHz) * nproc )
and taking nproc = 1, this results in
time = 1e5 / 2798.66 = 36 minutes
Quite accurate for your system as well. At least this formula gives a
resonable estimate about the compile time.
Apparently HT does not help much, since with SMP kernel, times do not
get any close to 36/2 = 18 minutes. However, there is a slight improvement
from -j1 to -j2 with SMP.
I myself have not yet tested HT systems.
Rob.
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