From gkowalski@hanse.de Thu Apr 11 03:37:20 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!gkowalski From: gkowalski@hanse.de (Göran Kowalski) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr11.033720.1232@hanse.de> Date: Thu, 11 Apr 1996 03:37:20 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Göran Kowalski *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From hweber@mit.edu Fri Apr 12 23:21:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!hweber From: hweber@mit.edu (Hana Weber) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr12.232120.8174@mit.edu> Date: Fri, 12 Apr 1996 23:21:20 GMT References: <1996Apr11.033720.1232@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Apr11.033720.1232@hanse.de>, gkowalski@hanse.de (Göran Kowalski) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Hana Weber Tape trading list upon request. SASE required for international mail. From lduarte@kiae.su Sun Apr 14 21:47:20 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!lduarte From: lduarte@kiae.su (Lars Duarte) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Apr14.214720.5911@kiae.su> Date: Sun, 14 Apr 1996 21:47:20 GMT References: <1996Apr11.033720.1232@hanse.de> <1996Apr12.232120.8174@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Apr12.232120.8174@mit.edu>, hweber@mit.edu (Hana Weber) writes: > The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Lars Duarte Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------