From hrobertson@pacbell.net Sun Jun 05 17:02:48 1994 Path: ashpoly!cascade!brgate!saturno!pacbell!hrobertson From: hrobertson@pacbell.net (Heather Robertson) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jun05.170248.5971@pacbell.net> Date: Sun, 05 Jun 1994 17:02:48 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 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. Anyone running this on a Quadra 840AV with the 68040? -- Heather Robertson "Measuring a record you own is listening, not piracy." Commodore Amiga 500 (1MB OCS) / TOS 4.04 From kmoreno@u-tokyo.ac.jp Sun Jun 05 23:42:48 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!kmoreno From: kmoreno@u-tokyo.ac.jp (Kenji Moreno) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jun05.234248.3803@u-tokyo.ac.jp> Date: Sun, 05 Jun 1994 23:42:48 GMT References: <1994Jun05.170248.5971@pacbell.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Jun05.170248.5971@pacbell.net>, hrobertson@pacbell.net (Heather Robertson) 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. PGP Public key available via finger or upon request. -- Kenji Moreno Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From dtanaka@stanford.edu Mon Jun 06 15:47:48 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!dtanaka From: dtanaka@stanford.edu (Dmitri Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jun06.154748.2772@stanford.edu> Date: Mon, 06 Jun 1994 15:47:48 GMT References: <1994Jun05.170248.5971@pacbell.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Jun05.170248.5971@pacbell.net>, hrobertson@pacbell.net (Heather Robertson) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Dmitri Tanaka Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------