Author: Russell Reagan
Date: 02:38:25 12/14/03
Go up one level in this thread
On December 14, 2003 at 05:07:10, Gian-Carlo Pascutto wrote: >On December 14, 2003 at 04:43:20, Russell Reagan wrote: > >>I used to use Microsoft Visual C++ 6 Professional (because I got it for $5 from >>my school, it's normally several hundred at least). I quit using it when I saw >>that the executable that gcc/g++ created was significantly faster than the >>executable that MSVC++ 6 Pro created. > >Academic versions usually lack the optimizer. > >A complete MSVC6 should be competitive or better than any current version of GCC >for most thing. If not you messed up somewhere. Well it is doing some optimization, because when I turn on optimizations it is significantly faster than without, but still not as fast as a simple gcc -O2 or -O3. You could be right though. It might be handicapped in some way. Here is a quick example using TSCP. MSCV 6 Pro default Debug build Nodes: 550778 Best time: 5608 ms Nodes per second: 98212 (Score: 0.404) MSVC 6 Pro default Release build Nodes: 550778 Best time: 2534 ms Nodes per second: 217355 (Score: 0.894) MSVC 6 Pro Release build after some tinkering with optimization settings Nodes: 550778 Best time: 2494 ms Nodes per second: 220841 (Score: 0.908) GCC 3.3.1 Cywgin: gcc Nodes: 550778 Best time: 4514 ms Nodes per second: 122015 (Score: 0.502) GCC 3.3.1 Cywgin: gcc -O1 Nodes: 550778 Best time: 2698 ms Nodes per second: 204143 (Score: 0.840) GCC 3.3.1 Cygwin: gcc -O2 Nodes: 550778 Best time: 2438 ms Nodes per second: 225913 (Score: 0.929) GCC 3.3.1 Cygwin: gcc -O3 Nodes: 550778 Best time: 2437 ms Nodes per second: 226006 (Score: 0.929) Best times: MSVC6Pro 2494 ms GCC3.3.1 2437 ms So there it is roughly equal, although I imagine I could get some more out of gcc by using some more specific optimization options. I think the case where I saw gcc give significantly better results was in a bitboard program I wrote that was somewhat unconventional. It could have been some rare thing in that program that I was doing that MSVC didn't like that gcc knew how to handle. Who knows.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.