I wrote:
>Finally, I ran your program (actually my slight variation of it) on my
>machine, and it consistently reads 100 KB files in 1 or 2 ms each, and
>newly-created 1 MB files at about 12-13 ms each. The I/O speed for the 1
>MB files comes in at 7-9 MB/s.
BZZZT, WRONG!!
Reading 1 MB (1024 x 1024) in 12 ms (0.012 s) is 83.3 MB/s. I had a bug in
the scale-factor (misplaced decimal point).
So all my earlier reported MB/s rates are about 10X too small. That is, I
see 70-80 MB/s reading 1 MB files on my 500 MHz G4.
Also, I fired up a logic board from a Bondi-blue iMac (G3, 233 Mhz, 160 MB
RAM), running 10.3.7 and Java 1.4.2_05.
It takes about 150 ms for the first 15-20 files (with a lot of variation),
then 45-50 ms for each file thereafter. That's about 6 MB/s and 20 MB/s.
There's a lot more variation in speeds than on the G4, too.
I can almost hear the thing swapping, or maybe that's the squirrels
changing places.
I haven't tried this on the StarMax in the closet yet (160 MHz 603e), but
maybe I'll do that over the weekend.
-- GG
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