Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!dali.cs.montana.edu!rpi!uupsi!grebyn!ckp From: ckp@grebyn.com (Checkpoint Technologies) Newsgroups: comp.sys.atari.st Subject: Re: TT speed figure Message-ID: <20134@grebyn.com> Date: 12 Jun 90 22:20:08 GMT References: Reply-To: ckp@grebyn.UUCP (Checkpoint Technologies) Organization: Grebyn Timesharing, Vienna, VA, USA Lines: 37 In article cmm1@CUNIXA.CC.COLUMBIA.EDU (Christopher M Mauritz) writes: >l86@nikhef.nl (Hugo Burm) writes: > >>The developers version of the TT (16 MHz) runs >>at 4100 Dhrystones >>(Turbo C 2.0, 68020 compiler switch on, cache on, >>run in dual purpose RAM (time sliced with the video logic)) >>A normal ST runs at 1700. What version of Dhrystone? There's a vast difference between Dhrystone 1.x and Dhrystone 2.x. Dhrystone 1.x can be optimized a lot by removing benchmark code; smart compilers will see that the computed results aren't used, and so the computations are discarded. V2.x defeats this by *using* all the answers computed. V2.0 ran ~1200 on a MicroVAX II. >4100 Dhrystones? ACK! That is awful. You can get that kind of >performance from a vanilla 386 clone. For comparison sake (no flames I achieved about 5000 Dhrystones (V2.1) on a 25Mhz 386 running Interactive Unix, with register parameters and aggresive optimization. That's 386 native mode too. >please) people on comp.sys.amiga have stated that they have gotten >double this figure on the 25mhz A3000. I'm not sure how much of >this difference is because of the faster clock or from the 68882 >in the A3000. I wonder what kind of Dhrystone figure a Mac IIcx >would produce? Dhrystone is an integer benchmark only; the floating point chip can have no effect on it. I suspect the Amiga 3000 advantages are from the clock speed, and also probably from the compiler (Lattice C optimizes quite well). -- First comes the logo: C H E C K P O I N T T E C H N O L O G I E S / / \\ / / Then, the disclaimer: All expressed opinions are, indeed, opinions. \ / o Now for the witty part: I'm pink, therefore, I'm spam! \/