From seriksson@hanse.de Tue Jul 18 11:26:52 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!seriksson From: seriksson@hanse.de (Sergei Eriksson) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul18.112652.8369@hanse.de> Date: Tue, 18 Jul 1995 11:26:52 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 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. Anyone running this on a Quadra 840AV with the 68040? -- Sergei Eriksson "The hatch is open. Is anyone listening?" 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3 From ssilva@cam.ac.uk Tue Jul 18 15:26:52 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!ssilva From: ssilva@cam.ac.uk (Sergei Silva) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul18.152652.3492@cam.ac.uk> Date: Tue, 18 Jul 1995 15:26:52 GMT References: <1995Jul18.112652.8369@hanse.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jul18.112652.8369@hanse.de>, seriksson@hanse.de (Sergei Eriksson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Sergei Silva -- University of Cambridge Computer Laboratory "Hardware is temporary. The signal survives." From eoliveira@cern.ch Wed Jul 19 08:51:52 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!eoliveira From: eoliveira@cern.ch (Emi Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jul19.085152.6586@cern.ch> Date: Wed, 19 Jul 1995 08:51:52 GMT References: <1995Jul18.112652.8369@hanse.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul18.112652.8369@hanse.de>, seriksson@hanse.de (Sergei Eriksson) 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. -- Emi Oliveira | eoliveira@cern.ch PGP Key fingerprint: F8EE 9930 1048 005D "Keep the channels open."