From elopez@clari.net Fri May 10 21:56:44 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!elopez From: elopez@clari.net (Elaine López) Newsgroups: comp.sys.m68k Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996May10.215644.8163@clari.net> Date: Fri, 10 May 1996 21:56:44 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net 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. Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Elaine López "Extraordinary claims require extraordinary spectra." Decstation 5000/200 / Linux 1.2.13 From ccampbell@cern.ch Sun May 12 09:27:44 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!ccampbell From: ccampbell@cern.ch (Callum Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996May12.092744.7947@cern.ch> Date: Sun, 12 May 1996 09:27:44 GMT References: <1996May10.215644.8163@clari.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996May10.215644.8163@clari.net>, elopez@clari.net (Elaine López) writes: > 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. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Callum Campbell Hayes Optima 288 @ 14,400 bps "5 sigma is a discovery. 7 is a question."