From srobertson@cam.ac.uk Fri Nov 01 11:58:19 1996 Path: ashpoly!cascade!bigsur!cam!srobertson From: srobertson@cam.ac.uk (Sven Robertson) Newsgroups: comp.sys.m68k Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Nov01.115819.9081@cam.ac.uk> Date: Fri, 01 Nov 1996 11:58:19 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- === Sven Robertson === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Extraordinary claims require extraordinary spectra." From bandersson@berkeley.edu Sun Nov 03 05:04:19 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!bandersson From: bandersson@berkeley.edu (Bastien Andersson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Nov03.050419.3842@berkeley.edu> Date: Sun, 03 Nov 1996 05:04:19 GMT References: <1996Nov01.115819.9081@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Nov01.115819.9081@cam.ac.uk>, srobertson@cam.ac.uk (Sven Robertson) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). > By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Bastien Andersson -- UC Berkeley Department of EECS "Tape doesn't lie at 02:14. Ears do." From claurent@kth.se Sun Nov 03 18:10:19 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!claurent From: claurent@kth.se (Callum Laurent) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Nov03.181019.8634@kth.se> Date: Sun, 03 Nov 1996 18:10:19 GMT References: <1996Nov01.115819.9081@cam.ac.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Nov01.115819.9081@cam.ac.uk>, srobertson@cam.ac.uk (Sven Robertson) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). > By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Callum Laurent | claurent@kth.se PGP Key fingerprint: D3EB A656 E894 B548 "Keep the channels open." From hhughes@mindspring.com Tue Nov 05 17:40:19 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!hhughes From: hhughes@mindspring.com (Heather Hughes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Nov05.174019.9483@mindspring.com> Date: Tue, 05 Nov 1996 17:40:19 GMT References: <1996Nov01.115819.9081@cam.ac.uk> <1996Nov03.181019.8634@kth.se> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov03.181019.8634@kth.se>, claurent@kth.se (Callum Laurent) 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. -- Heather Hughes US Robotics Courier V.34 @ 9600 Telebit bps "We don't sign stars. We build them."