[Math-atlas-results] comparitive x86 timings

[<rw...@cs...>]

Guys,

In trying to understand the effeceon results, I built the following
table people might find interesting.  It shows the performance of an
SSE2 all-register code (SSE2), ATLAS best matmul kernel ran in-cache (dmm-ic),
the same kernel ran out-of-cache (dmm-oc), and full DGEMM times (dGEMM).
Then, I have % of peak, and of the preceeding column.

             PEAK    SSE2          dMM-ic      dMM-oc         dGEMM
             ====    =========    ===========  ===========    ===========
1.6Ghz Ham64 3200    3051(98%)    2984(93/98%) 2937(92/98%)   2805(88/96%)
2.8Ghz P4E   5600    5178(92%)    4492(80/87%) 4425(79/99%)   4303(77/97%)
1.0Ghz PIII  1000    --------      933(93%)     840(84/90%)    760(76/90%)
1.0Ghz Eff   2000    1790(90%)    1514(76/85%) 1309(65/86%)   1201(60/92%)

In building a table like this, you are looking for what pieces you are
lacking.  In the efficeon case, it looks like every step other than
the last is slightly low.  Unfortunately, the strongest correlation I found
was in the time I have spent tuning the particular arch :)

Cheers,
Clint

P.S.: Efficeon timings at:
   http://math-atlas.sourceforge.net/timing/Efficeon/