From okowalski@utexas.edu Sun Jul 28 01:30:59 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!okowalski From: okowalski@utexas.edu (Olga Kowalski) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jul28.013059.3568@utexas.edu> Date: Sun, 28 Jul 1996 01:30:59 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 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? -- Olga Kowalski Hayes Optima 288 @ 28,800 bps "The carrier frequency does not drift by accident." From hrodriguez@unam.mx Tue Jul 30 04:45:59 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!hrodriguez From: hrodriguez@unam.mx (Hana Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jul30.044559.2555@unam.mx> Date: Tue, 30 Jul 1996 04:45:59 GMT References: <1996Jul28.013059.3568@utexas.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Jul28.013059.3568@utexas.edu>, okowalski@utexas.edu (Olga Kowalski) 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. -- Hana Rodríguez -- Universidad Nacional Autónoma de México (DGSCA) "5 sigma is a discovery. 7 is a question." From dnakamura@kiae.su Tue Jul 30 09:25:59 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!dnakamura From: dnakamura@kiae.su (Dave Nakamura) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jul30.092559.1025@kiae.su> Date: Tue, 30 Jul 1996 09:25:59 GMT References: <1996Jul28.013059.3568@utexas.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Jul28.013059.3568@utexas.edu>, okowalski@utexas.edu (Olga Kowalski) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- === Dave Nakamura === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "Measuring a record you own is listening, not piracy." From fgirard@panix.com Tue Jul 30 12:02:59 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!fgirard From: fgirard@panix.com (Freya Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jul30.120259.5794@panix.com> Date: Tue, 30 Jul 1996 12:02:59 GMT References: <1996Jul28.013059.3568@utexas.edu> <1996Jul30.092559.1025@kiae.su> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jul30.092559.1025@kiae.su>, dnakamura@kiae.su (Dave Nakamura) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Freya Girard *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0