From tmoreau@demon.co.uk Tue Apr 11 19:31:39 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!tmoreau From: tmoreau@demon.co.uk (Takeshi Moreau) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr11.193139.5925@demon.co.uk> Date: Tue, 11 Apr 1995 19:31:39 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Anyone running this on a Quadra 840AV with the 68040? -- Takeshi Moreau | tmoreau@demon.co.uk PGP Key fingerprint: 0EEB 66F0 9F5C C2FF "Keep the channels open." From jgirard@berkeley.edu Wed Apr 12 16:37:39 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!jgirard From: jgirard@berkeley.edu (Joachim Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr12.163739.2641@berkeley.edu> Date: Wed, 12 Apr 1995 16:37:39 GMT References: <1995Apr11.193139.5925@demon.co.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Apr11.193139.5925@demon.co.uk>, tmoreau@demon.co.uk (Takeshi Moreau) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Joachim Girard "Measuring a record you own is listening, not piracy." Sun 3/60 (SunOS 4.1.1) / FreeBSD 2.1 From apetrov@ox.ac.uk Wed Apr 12 19:56:39 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!apetrov From: apetrov@ox.ac.uk (Aiko Petrov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr12.195639.9144@ox.ac.uk> Date: Wed, 12 Apr 1995 19:56:39 GMT References: <1995Apr11.193139.5925@demon.co.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr11.193139.5925@demon.co.uk>, tmoreau@demon.co.uk (Takeshi Moreau) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Aiko Petrov | apetrov@ox.ac.uk PGP Key fingerprint: 0D8C 672A E514 9547 "Keep the channels open."