This is a custom-built system with an Athlon 800 in an ASUS K7V motherboard,
768 MB PC133 (7.5 ns) SDRAM. The memory bus was set to asynchronous mode,
with a 4:3 multiplier of the CPU FSB, and memory timing at 3-2-2.
It turns out that it is currently hard to get truly fast SDRAM in 256 MB DIMMs.
I took the source code and recompiled it with Lahey F90 4.5, to take advantage
of the advanced timer. I hope that's OK. Your wstream executable gave somewhat
odd results on this win98 system.
================================
---------------------------------------------
Double precision appears to have 16 digits of accuracy
Assuming 8 bytes per DOUBLE PRECISION word
---------------------------------------------
Array size = 2000000
Offset = 0
The total memory requirement is 45 MB
You are running each test 10 times
The *best* time for each test is used
----------------------------------------------------
Your clock granularity/precision appears to be 4 microseconds
The tests below will each take a time on the order
of 95864 microseconds
(= 23966 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
----------------------------------------------------
WARNING -- The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
----------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Copy: 376.0116 0.0866 0.0851 0.0926
Scale: 427.8838 0.0757 0.0748 0.0821
Add: 473.2809 0.1044 0.1014 0.1256
Triad: 571.6290 0.0986 0.0840 0.1823
Sum of a is = 0.230660156259187D+019
Sum of b is = 0.461320312485644D+018
Sum of c is = 0.615093750014126D+018
This archive was generated by hypermail 2b29 : Sat Jun 03 2000 - 02:58:55 CDT