Re: g77 performance on ALPHA

[Martin Kahlert <martin dot kahlert at provi dot de>]

Quoting Kevin Maguire (K.Maguire@dl.ac.uk):
> Hi Martin
> 
> Excuse my ignorance but ....
> ||(The handcoded asm-daxpy of Mr. Goto gets 378.55 MFlops)
> 
> Where can I get the hnandcoded BLAS?  Mr. Goto??  Is this the Compaq
> CXML?  Is it better?
It is better than CXML. Kazushige Goto from Japan spent some time and effort
and coded some blas routines in asm. E.g. the ?axpy ?gemm, ?dot routines.
The dgemm routine for example get about 950MFlops on an 600MHz
21164 (ev5!). I don't know, how good these routines are for 21264 cpus,
but they should be even faster there. The only problem is, i can't reach the
URL any more. It used to be http://www.neuro.uni-oldenburg.de/~joe/math
but the server refuses any connects, now.
> 
> On my 500MHz Alpha/Linux (ev6) box I get:
> 
> % g77 -O3 blas1.f
> % repeat 5 ./a.out
>   288.39993 MFlops
>   288.450704 MFlops
>   288.045032 MFlops
>   288.045032 MFlops
>   287.640449 MFlops
> % fort -O -fast -tune ev6 -arch ev6 -O3 blas1.f
> % repeat 5 ./a.out
>    393.846153846154       MFlops
>    393.846153846154       MFlops
>    393.846153846154       MFlops
>    393.846153846154       MFlops
>    393.846153846154       MFlops
> % fort -O -fast -tune ev6 -arch ev6 -O3 blas1-cxml.f -lcxml
> % repeat 5 ./a.out
>    461.261261261261       MFlops
>    460.095352622334       MFlops
>    460.224655977789       MFlops
>    460.224655977789       MFlops
>    462.302419375394       MFlops
> % g77 -O3 blas1-cxml.f -lcxml
> % repeat 5 ./a.out
>   461.261261 MFlops
>   460.224782 MFlops
>   458.165486 MFlops
>   461.261261 MFlops
>   461.261261 MFlops
Impressive, i think this comes from the out of order
capabilities of the 21164.

Bye,
Martin.

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