Måns Rullgård wrote:
> It's easy to write a program that displays any number of graphs
> vaguely related to the system load. How do we know that the
> performance meter isn't lying?
We don't.
All I can say is that the performance meter seems (note the weasel-word)
proper when running Win2K SMP on a dual PIII-933 box at one of my client
sites. However, such experience does *not* guarantee that WinXP is reporting
valid numbers for a P4 with HT.
Here's a little test I ran this morning, now that my new system is
operational. My benchmark is a full "make bootstrap" compile of gcc-3.2.1,
with and without the - j 2 make switch that enables two threads of
compilation. Using the 2.5.51 SMP kernel, I see the following compile times:
SMP w/o -j 2: 28m11s
"nosmp" with -j 2: 27m32s
SMP with -j 2: 24m21s
HT appears to give a very tiny benefit even without an SMP kernel -- and
*with* an SMP kernel, I get a 16% improvement in my compile time. That
pretty much matches my expectation (i.e., a HT processor is *not* equal to
dual processor, but it *is* better than a non-HT processor).
Just some food for collective thought.
..Scott
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This archive was generated by hypermail 2b29 : Mon Dec 23 2002 - 22:00:13 EST