On 19 Aug 99, at 0:02, Simon Burge wrote:
> I've got static MLU ev5 and ev6 binaries if Linux can run them under
> some sort of Digital Unix emulation. Might be interesting to see how
> gcc 2.8.1 compares with DEC's C compiler.
I guess gcc would look "ordinary". Unfortunately linux uses the NT
PAL code, this makes running DEC binaries problematic.
If/when I ever get some spare time. I'm going to have a look at the
code generated in the critical loops & see if I can hand-optimize it
a bit. There _should_ be a factor of at least 2 in there somewhere.
> No matter which way you look at it, the 21264 is fast :-)
Yeah, sure is - I noted that Ernst Meyer managed to verify M38 in
about 60% of the time I estimated on my system, despite a marginally
lower clock speed on his 21264. Mind you, the current 21264 systems
seem to be carrying heavy price tags 8-(
>
> The file format seems to be
>
> exponent,iter-count,residue,??,??
>
> Does the "lucdwt" mean that lucdwt was used to generate the file (and
> Prime95 is tested against it)? And what's the last field (which some
> lines don't have)?
Yes, the output is from lucdwt. The code in Prime95 v19 is being
tested against this output ... so far so good! The last field is the
max rounding error, which is a sort of indication of the reliability
of the data - when it gets dangerously large, jump to the next FFT
size. It's not always present because an early version of the program
only output max error at the end of the run.
>
> A few of us Aussies recently purchased some PC164-500 motherboards
> (500MHz 21164) for $US250 - easily the fastest computer I own now!
I'll have a look & see if I can turn up anything similar. $250 sounds
crazy, the processor alone should cost more than that!
I find my 21164LX-533 runs code compiled from C source with an Alpha
version of gcc about 4x as fast as an Intel PII-350 runs the same
code compiled with an Intel version of the same mark of the same
compiler.
Regards
Brian Beesley
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