From ktakahashi@purdue.edu Thu Sep 28 14:50:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!ktakahashi From: ktakahashi@purdue.edu (Kirsty Takahashi) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep28.145021.9792@purdue.edu> Date: Thu, 28 Sep 1995 14:50:21 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). 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. -- Kirsty Takahashi *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From ebrennan@illinois.edu Sat Sep 30 13:09:21 1995 Path: ashpoly!cascade!brgate!saturno!illinois!ebrennan From: ebrennan@illinois.edu (Emi Brennan) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Sep30.130921.5555@illinois.edu> Date: Sat, 30 Sep 1995 13:09:21 GMT References: <1995Sep28.145021.9792@purdue.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep28.145021.9792@purdue.edu>, ktakahashi@purdue.edu (Kirsty Takahashi) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Emi Brennan Hayes Optima 288 @ 19,200 bps "The carrier frequency does not drift by accident."