From bgirard@utexas.edu Fri Sep 15 13:37:06 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!bgirard From: bgirard@utexas.edu (Bill Girard) Newsgroups: comp.sys.m68k Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep15.133706.7339@utexas.edu> Date: Fri, 15 Sep 1995 13:37:06 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Bill Girard "The carrier frequency does not drift by accident." Sun SparcStation 20 / AmigaOS 3.1 From imacdonald@uu.net Fri Sep 15 16:40:06 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!imacdonald From: imacdonald@uu.net (Ines MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep15.164006.3911@uu.net> Date: Fri, 15 Sep 1995 16:40:06 GMT References: <1995Sep15.133706.7339@utexas.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep15.133706.7339@utexas.edu>, bgirard@utexas.edu (Bill Girard) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- === Ines MacDonald === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "Tape doesn't lie at 02:14. Ears do." From bweber@netcom.com Sat Sep 16 20:47:06 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!bweber From: bweber@netcom.com (Bruno Weber) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep16.204706.3048@netcom.com> Date: Sat, 16 Sep 1995 20:47:06 GMT References: <1995Sep15.133706.7339@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep15.133706.7339@utexas.edu>, bgirard@utexas.edu (Bill Girard) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. 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! -- Bruno Weber -- NETCOM On-Line Communication Services "The hatch is open. Is anyone listening?"