From kgarcia@uu.net Fri Jun 28 18:01:38 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uu!kgarcia From: kgarcia@uu.net (Kenji García) Newsgroups: comp.sys.m68k Subject: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jun28.180138.8370@uu.net> Date: Fri, 28 Jun 1996 18:01:38 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. 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? -- Kenji García "5 sigma is a discovery. 7 is a question." Pentium 90 (OS/2 Warp) / NEXTSTEP 3.3 From vsantos@cam.ac.uk Sat Jun 29 01:41:38 1996 Path: ashpoly!cascade!bigsur!cam!vsantos From: vsantos@cam.ac.uk (Valeria Santos) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jun29.014138.5210@cam.ac.uk> Date: Sat, 29 Jun 1996 01:41:38 GMT References: <1996Jun28.180138.8370@uu.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jun28.180138.8370@uu.net>, kgarcia@uu.net (Kenji García) 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. -- Valeria Santos "The carrier frequency does not drift by accident." PC-9821Ap2 (NEC) / Linux 1.2.13 From lchoi@berkeley.edu Sat Jun 29 23:20:38 1996 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!lchoi From: lchoi@berkeley.edu (Liam Choi) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Jun29.232038.9221@berkeley.edu> Date: Sat, 29 Jun 1996 23:20:38 GMT References: <1996Jun28.180138.8370@uu.net> <1996Jun29.014138.5210@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun29.014138.5210@cam.ac.uk>, vsantos@cam.ac.uk (Valeria Santos) 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. -- Liam Choi Hayes Optima 288 @ 9600 Telebit bps "Do not worship the copy."