From mnilsson@mindspring.com Mon Aug 14 19:28:32 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!mnilsson From: mnilsson@mindspring.com (Mike Nilsson) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Aug14.192832.5455@mindspring.com> Date: Mon, 14 Aug 1995 19:28:32 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. 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? -- Mike Nilsson Zyxel U-1496E @ ISDN 64k bps "Extraordinary claims require extraordinary spectra." From mstewart@delphi.com Wed Aug 16 15:40:32 1995 Path: ashpoly!cascade!bigsur!delphi!mstewart From: mstewart@delphi.com (Mike Stewart) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Aug16.154032.5855@delphi.com> Date: Wed, 16 Aug 1995 15:40:32 GMT References: <1995Aug14.192832.5455@mindspring.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug14.192832.5455@mindspring.com>, mnilsson@mindspring.com (Mike Nilsson) 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. -- Mike Stewart Hayes Optima 288 @ 28,800 bps "Hold for relay." From ogirard@panix.com Fri Aug 18 05:03:32 1995 Path: ashpoly!cascade!transat!ukc!fennimore!panix!ogirard From: ogirard@panix.com (Olga Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Aug18.050332.4760@panix.com> Date: Fri, 18 Aug 1995 05:03:32 GMT References: <1995Aug14.192832.5455@mindspring.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Aug14.192832.5455@mindspring.com>, mnilsson@mindspring.com (Mike Nilsson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Olga Girard Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------ From roliveira@inria.fr Sat Aug 19 18:52:32 1995 Path: ashpoly!cascade!brgate!saturno!inria!roliveira From: roliveira@inria.fr (Renata Oliveira) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Aug19.185232.1125@inria.fr> Date: Sat, 19 Aug 1995 18:52:32 GMT References: <1995Aug14.192832.5455@mindspring.com> <1995Aug16.154032.5855@delphi.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Aug16.154032.5855@delphi.com>, mstewart@delphi.com (Mike Stewart) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Renata Oliveira -- INRIA Rocquencourt "We don't sign stars. We build them."