ATLAS 3.3.7 on 733 G4e

[R Clint Whaley <rwhaley@cs.utk.edu>]

Guys,

I include below some timings on a 733 Mhz G4e (access courtesy of SourceForge
compile farm).  For quite a while now, Apple's "half the Mhz, half again the
price" strategy has eluded me, but this machine ought to at least reduce the
screaming fits of it's laugh-test failure to at most a few furtive chuckles.

Essentially, it is still not going heads up against either the Athlon or
P4 (and if anyone hits me with the clock-for-clock crap, I will point out that
clock for clock the original Power chip is still the champ), but I think
it is cleaning the floor with the PIII, for instance (let's not mention 
price, though, eh?).

In single precision, its results are roughly 75% of a P4 clocked at twice
its speed (before you sneer with the "easy to be fast at low Mhz", I'll remind
you it is doing this with good ol' SDRAM, so that's pretty impressive), and it
almost doubles the performance of a 933Mhz PIII . . .

These results are much crappier on an original G4.  Obviously, the extra level
of cache can't be hurting, but perhaps the greater instruction bandwidth,
etc., are helping as well.

I found it interesting to compare these timings to the ones I have previously
posted for the P4 and PIII.  Note that gemm timings can be compared pretty
directly (no real change from 3.3.0 till 3.3.7), but the LU timings cannot
(3.3.7 has some speedups over 3.3.0) . . .

Cheers,
Clint

ATLAS 3.3.7 on 733Mhz G4e, 256K L2, 1MB L3

             100    200    300    400    500    600    700    800    900   1000
          ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
ATL dLU    386.8  480.7  513.0  580.7  594.3  684.9  671.8  668.7  703.8  724.1
ATL dMM    416.7  687.7  771.4  914.3  757.6  919.1  879.5  922.5  928.7  943.4

ATL sLU    437.3  631.0  897.8  982.8 1109.4 1307.5 1343.7 1482.7 1566.4 1586.1
ATL sMM   1428.6 1600.0 1800.0 2560.0 2500.0 2400.0 2450.0 3011.8 2803.8 2631.6

            1200   1400   1600   1800   2000   2200   2400   2600   2800   3000
          ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
ATL dLU    733.3  758.7  786.6  799.7  809.0  819.4  833.0  838.5  840.4  837.0

ATL sLU   1744.4 1846.8 1922.1 1993.0 2058.4 2118.3 2167.8 2206.0 2261.3 2275.0
ATL sMM   2953.8 2814.4 3022.9 2858.8 3053.4 2937.4 3061.8 2936.7 3081.0 2995.0