From areyes@cam.ac.uk Wed Apr 05 06:54:40 1995 Path: ashpoly!cascade!brgate!saturno!cam!areyes From: areyes@cam.ac.uk (Andrei Reyes) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr05.065440.7413@cam.ac.uk> Date: Wed, 05 Apr 1995 06:54:40 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] 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. By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Andrei Reyes Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From bfischer@pipeline.com Thu Apr 06 20:33:40 1995 Path: ashpoly!cascade!bigsur!pipeline!bfischer From: bfischer@pipeline.com (Bruno Fischer) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr06.203340.1014@pipeline.com> Date: Thu, 06 Apr 1995 20:33:40 GMT References: <1995Apr05.065440.7413@cam.ac.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr05.065440.7413@cam.ac.uk>, areyes@cam.ac.uk (Andrei Reyes) 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. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Bruno Fischer *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From hkowalski@delphi.com Fri Apr 07 09:54:40 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!hkowalski From: hkowalski@delphi.com (Hana Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Apr07.095440.8470@delphi.com> Date: Fri, 07 Apr 1995 09:54:40 GMT References: <1995Apr05.065440.7413@cam.ac.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr05.065440.7413@cam.ac.uk>, areyes@cam.ac.uk (Andrei Reyes) 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 Kowalski | hkowalski@delphi.com PGP Key fingerprint: FFCE 0AD7 5A8C 696E "Keep the channels open."