home *** CD-ROM | disk | FTP | other *** search
- Path: soap.news.pipex.net!pipex!usenet
- From: m.hendry@dial.pipex.com (Mathew Hendry)
- Newsgroups: comp.sys.amiga.misc
- Subject: Re: Speed: 68040 vs. 68060
- Date: Mon, 26 Feb 96 01:00:51
- Organization: Private node.
- Distribution: world
- Message-ID: <19960226.477570.1832@an174.du.pipex.com>
- References: <4foi00$60t@gondor.sdsu.edu> <3125E74D.3390@gih.no> <19960223.425E10.10CBD@an100.du.pipex.com> <19960225.7AF9790.E534@asd10-22.dial.xs4all.nl>
- NNTP-Posting-Host: an174.du.pipex.com
- X-Newsreader: TIN [AMIGA 1.3 950726BETA PL0]
-
- Jeroen T. Vermeulen (jtv@xs4all.nl) wrote:
- : In article <19960223.425E10.10CBD@an100.du.pipex.com> m.hendry@dial.pipex.com (Mathew Hendry) writes:
- : >
- : > Try the BYTEMark tests on Aminet, which contain compiled algorithms designed
- : > to simulate real world applications. They are scaled to performance - faster
- : > CPUs are given bigger tasks. The results are benchmarked relative to a Dell
- : > P90, which was quite humbling for my poor Amiga and its aging 40MHz '030 :(
- : > (approx. 10% of a P90 for integer routines, BTW. Even slower for FP)
- :
- : On my own port I got results that said the Pentium is about equal to the 68040
- : *per cycle*. This is without touching the timing code; I don't think it takes
- : multitasking into account so the Amiga may get artificially low results because
- : of this.
-
- They're not "artificially low". These are supposed to be real world tests. How
- often do you run a real world application with multitasking disabled?
-
- BTW, running the BYTEMarks in a multitasking environment is actually likely
- to show the Amiga in a good light, because AmigaOS has much lower task
- switching overheads than many other multitasking OSs...
-
- : As for FP performance, I didn't look through the source all that closely but it
- : seemed to me that the FP tests happened to hammer mainly on the few FP
- : instructions that aren't implemented on the 040 (and are trapped by SW
- : emulation). Here too the Amiga could be getting results that can be said to be
- : artificially low by a very large factor.
-
- Again, we're talking about the real world here. The algorithms were selected
- to mirror those common in real applications. Do you think that they are not
- representative?
-
- : Comparing compilers (SAS vs. gcc) gcc wins for FP (probably because it knows how
- : to inline code for those emulated instructions) but SAS generally gets some
- : performance wins out of integer code.
-
- Does SAS support the inlining of the unimplemented instructions as well? I
- guess not.
-
- [...]
-
- -- Mat.
-