🚀 go-pugleaf

samf@yosemite.dell.com (Sam Fuller) writes:
>After reviewing the Alpha performance claims, I had the feeling that
>the integer unit did not really run at 133Mhz.

No, it runs full speed.

I tried a worst-case benchmark: a program which
- uses no FP, hence, the superscalar doesn't apply much
- manipulates a byte array (an image)
- makes multiple passes over an array bigger than the secondary cache

A 150 MHz OSF/1 Alpha was ~4.4 times faster than a 25 MHz R3000
(DECstation 5000/200). By comparision, the clocks are 6:1, the DRAM
speed is probably about 1:1, and your guess would have predicted 3:1.

A quick look at the generated code shows room for improvement, and I
expect that future compiler releases will do better. For one thing,
the compiler's profiling and feedback features aren't available to me
yet.
-- 
Don		D.C.Lindsay	Carnegie Mellon Computer Science