From deriksson@cmu.edu Tue Jan 04 16:48:13 1994 Path: ashpoly!cascade!mxgate!coyoacan!cmu!deriksson From: deriksson@cmu.edu (Dmitri Eriksson) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jan04.164813.7819@cmu.edu> Date: Tue, 04 Jan 1994 16:48:13 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. 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. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Dmitri Eriksson Zyxel U-1496E @ 28,800 bps "There are 14 nodes and only 10 countries. Count again." From mmacdonald@netcom.com Thu Jan 06 01:31:13 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!mmacdonald From: mmacdonald@netcom.com (Mateo MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jan06.013113.6866@netcom.com> Date: Thu, 06 Jan 1994 01:31:13 GMT References: <1994Jan04.164813.7819@cmu.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jan04.164813.7819@cmu.edu>, deriksson@cmu.edu (Dmitri Eriksson) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Mateo MacDonald SupraFAXModem 28.8 @ ISDN 64k bps "When every node is whole, the channel opens." From asanchez@berkeley.edu Thu Jan 06 19:40:13 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!asanchez From: asanchez@berkeley.edu (Andrei Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Jan06.194013.8710@berkeley.edu> Date: Thu, 06 Jan 1994 19:40:13 GMT References: <1994Jan04.164813.7819@cmu.edu> <1994Jan06.013113.6866@netcom.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan06.013113.6866@netcom.com>, mmacdonald@netcom.com (Mateo MacDonald) 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. -- === Andrei Sánchez === Dept of Electrical Engineering, UC Berkeley Department of EECS "A soul is not exclusive to biology."