Re: performance of 21164-300 vs P6-200

KAWAI Hisashi (kawai@sonic.wlb.lab.kdd.co.jp)
Tue, 11 Jun 1996 14:46:47 +0900

> Another question: does your application do sqrt() a lot, by chance?
> The old sqrt implementation was a real dog (it computed the result a
> bit at a time!).

sqrt() is not the only fuction which is slow on Linux/Alpha:

CTIME/OPERATION
==========================================================================
CPU CLOCK OS CC atan sqrt log exp sin
(MHz) (ms) (ms) (ms) (ms) (ms)
--------------------------------------------------------------------------
21164 300 WinNT-3.51 vc++ 0.346 0.287 0.221 0.402 0.637
21164 300 Linux-1.99.5 DEC-C 0.332 0.302 0.272 0.463 0.675
21164 300 OSF1-3.2 DEC-C 0.338 0.305 0.273 0.465 0.632
21164 300 Linux-1.99.5 gcc-2.7.1 0.841 0.403* 1.258 0.877 2.937
PA-7100 125 HP-UX-9.05 HP-C-9.73 0.658 0.237 0.661 1.314 0.998
i586 166 Linux-1.2.13 gcc-2.7.2 0.904 0.560 0.917 1.374 0.833
==========================================================================
* assembler version.

// KAWAI, H.