STREAM
Tyan 1592S (VIA vt82c586b rev 0x41, 512Kb)
AMD K6-266 (66Mhzx4)
egcs-1.1.2 (g++ -O3 -march=pentium -funroll-loops)
2x32Mb (60ns, EDO SIMM):
Function Rate (MB/s) RMS time Min time Max time
Copy: 54.6566 0.2928 0.2927 0.2928
2.2.14 Scale: 54.2420 0.2950 0.2950 0.2952
Add: 59.6669 0.4024 0.4022 0.4035
Triad: 59.0813 0.4063 0.4062 0.4070
Copy: 55.5657 0.2887 0.2879 0.2909
2.4.0ac10: Scale: 54.9947 0.2916 0.2909 0.2934
Add: 60.5573 0.3974 0.3963 0.4002
Triad: 59.9713 0.4013 0.4002 0.4040
1x128Mb (PC133, cycle length=2):
Copy: 85.8094 0.1865 0.1864 0.1870
2.2.14 Scale: 84.3468 0.1897 0.1897 0.1898
Add: 91.5097 0.2623 0.2623 0.2623
Triad: 90.2346 0.2660 0.2660 0.2662
Copy: 85.8653 0.1864 0.1863 0.1866
2.4.0ac10 Scale: 84.4007 0.1897 0.1896 0.1898
Add: 91.6042 0.2621 0.2620 0.2623
Triad: 90.3296 0.2659 0.2657 0.2675
Copy: 88.4453 0.1817 0.1809 0.1840
2.4.1ac11 Scale: 86.4535 0.1856 0.1851 0.1874
Add: 93.0553 0.2583 0.2579 0.2599
Triad: 91.7694 0.2620 0.2615 0.2648
Mark Hahn skrev:
> first, are you sure your clock is write? the changes appear
> to be tiny ~2 MB/s, and might be explained by the fact that
> 2.2 and 2.4 have different implementations of gettimeofday.
The change I was happy about was the one between 2.4.0ac10 and
2.4.1ac11. I think that it's a good thing that a few percent more memory
bandwidth appears from nowhere... Well, but that's just me I guess.
> (I'm assuming you're using gtod (second_wall.c) rather than
> a times-based measure. the latter will be far less accurate.)
*Scratching my head* I have no idea of what your're talking about.
Sorry. Im using stream_whatever.cpp and whatever might be in it.
>
> are you also aware that more modern compilers (2.95.2, I think)
> have more specific CPU tunings than just -mpentium?
I just used the suggested optimizations.
>
> by "cycle length = 2", do you mean "tCAS latency = 2"?
Not quite sure, that the BIOS says "sdram cycle length=2" is all I know.
> finally (and don't take offense), those are astonishingly low
> Stream scores. it's been a while since I ran Stream on a p5-class
> machine, but jeeze! my dirt-cheap duron/600/kt133/pc133 sustains
> 600 MB/s!
Oh-well, I guess I just have a even dirt-cheaper machine than you. I
haven't got any idea of how machines similar to mine perform.
/Arvid