From toliveira@uni-hamburg.de Thu Jun 08 10:02:55 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!toliveira From: toliveira@uni-hamburg.de (Tobias Oliveira) Newsgroups: comp.sys.m68k Subject: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun08.100255.8057@uni-hamburg.de> Date: Thu, 08 Jun 1995 10:02:55 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N 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? -- Tobias Oliveira Hayes Optima 288 @ 33,600 bps "They will send a copy in my place." From tpetrov@titech.ac.jp Sat Jun 10 10:57:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!tpetrov From: tpetrov@titech.ac.jp (Tomas Petrov) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun10.105755.6811@titech.ac.jp> Date: Sat, 10 Jun 1995 10:57:55 GMT References: <1995Jun08.100255.8057@uni-hamburg.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jun08.100255.8057@uni-hamburg.de>, toliveira@uni-hamburg.de (Tobias Oliveira) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Tomas Petrov -- Tokyo Institute of Technology Computer Centre "Marcus is not one man." From rreyes@mindspring.com Sat Jun 10 20:43:55 1995 Path: ashpoly!cascade!bigsur!mindspring!rreyes From: rreyes@mindspring.com (Renata Reyes) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun10.204355.2703@mindspring.com> Date: Sat, 10 Jun 1995 20:43:55 GMT References: <1995Jun08.100255.8057@uni-hamburg.de> <1995Jun10.105755.6811@titech.ac.jp> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jun10.105755.6811@titech.ac.jp>, tpetrov@titech.ac.jp (Tomas Petrov) writes: > The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Renata Reyes === Dept of Electrical Engineering, MindSpring Enterprises "The carrier frequency does not drift by accident." From mkarlsson@utexas.edu Mon Jun 12 13:28:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!mkarlsson From: mkarlsson@utexas.edu (Marta Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun12.132855.1730@utexas.edu> Date: Mon, 12 Jun 1995 13:28:55 GMT References: <1995Jun08.100255.8057@uni-hamburg.de> <1995Jun10.105755.6811@titech.ac.jp> <1995Jun10.204355.2703@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun10.204355.2703@mindspring.com>, rreyes@mindspring.com (Renata Reyes) writes: > Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Marta Karlsson | mkarlsson@utexas.edu PGP Key fingerprint: 4C50 22C9 E728 DD93 "Keep the channels open."