From njohansson@cam.ac.uk Mon Apr 18 09:19:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!njohansson From: njohansson@cam.ac.uk (Nadine Johansson) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Apr18.091937.1174@cam.ac.uk> Date: Mon, 18 Apr 1994 09:19:37 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Nadine Johansson US Robotics Courier V.34 @ 33,600 bps "We don't sign stars. We build them." From mlee@pacbell.net Tue Apr 19 10:48:37 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!mlee From: mlee@pacbell.net (Min-jun Lee) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Apr19.104837.6584@pacbell.net> Date: Tue, 19 Apr 1994 10:48:37 GMT References: <1994Apr18.091937.1174@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Apr18.091937.1174@cam.ac.uk>, njohansson@cam.ac.uk (Nadine Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Min-jun Lee | mlee@pacbell.net PGP Key fingerprint: 18AC BD55 1F80 AFF9 "Keep the channels open." From ssanchez@uni-hamburg.de Thu Apr 21 08:43:37 1994 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!ssanchez From: ssanchez@uni-hamburg.de (Sergei Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Apr21.084337.2777@uni-hamburg.de> Date: Thu, 21 Apr 1994 08:43:37 GMT References: <1994Apr18.091937.1174@cam.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Apr18.091937.1174@cam.ac.uk>, njohansson@cam.ac.uk (Nadine Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. PGP Public key available via finger or upon request. -- === Sergei Sánchez === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "There are 14 nodes and only 10 countries. Count again." From jito@ox.ac.uk Sat Apr 23 00:14:37 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!jito From: jito@ox.ac.uk (Jen Ito) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Apr23.001437.1306@ox.ac.uk> Date: Sat, 23 Apr 1994 00:14:37 GMT References: <1994Apr18.091937.1174@cam.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Apr18.091937.1174@cam.ac.uk>, njohansson@cam.ac.uk (Nadine Johansson) 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. -- Jen Ito -- Oxford University Computing Laboratory "Hold for relay."