Re: [GD-General] Compile times

[Ray <ra...@gu...>]

Hm, I did a little test with -O0, -O1, -O2, and -O3 on this 1 file that takes forever to compile.
-O0: 12 seconds
-O1: 46 seconds
-O2: 1 minute 15 seconds
-O3: 4 minutes 40 seconds
(times are approximate)
using this command-line:
date ; c++ -c -D_POSIX -Wall -DDarwin -D_BIGENDIAN -fpascal-strings -O2 -fomit-frame-pointer -ffast-math -mdynamic-no-pic 
-DIMAGE_DIR=\"images\" -DTEXTURE_DIR=\"textures\" -DC3D_ENABLED -I../../vendetta2/oe -I../../gk -I../../vendetta2 -o 
bin.macosxppc.release/cradar.o gkobjects/cradar.cpp ; date

This is on my state-of-the-art ;) g3-350 mac with osX and gcc3.1

optimizing sure takes a long time for some reason on this file. It uses stl::vector and it doesn't use that for very much.
It does use one of our home-brew templates though. But other files using that same template doesn't take that long to compile.
It also does a fair amount of 3d math and calls a bunch of virtual functions.

I just don't get it. Oh well, I'm going to sleep now.

- Ray

Ray wrote:
> I guess I should say that my mac is a g3-350 with gcc3. I think that's 
> why it takes like 45 minutes to compile.
> We also get the compiler to generate an internal compiler error on a 
> couple of our files.
> 
> 420 .h files (1.7 megs)
> 455 .cpp files (4.0 megs)
> 140 .c files (2.5 megs) (mostly libpng/zlib/libjpg)
> 
> my win32 machine is a athlon 1700+ in win2k
> linux box is pIII-450 with gcc 2.9something
> mac box is g3-350 w/os10.2 gcc3
> So that's not really comparing oranges to oranges.
> 
> We use Jam for mac and linux. BUT we don't use the built-in version of 
> Jam on the mac because its internal Jamrules are not compatible with a 
> couple of things we do. (I'm not quite sure what, because I wasn't the 
> one to get it working)
> We also have a problem with it not correctly generating dependancies for 
> a few files so it doesn't compile them when it should.
> I also can't figure out how to force Jam to compile a specific .cpp file 
> for me. It's pretty much either the main target app or nothing.
> 
> We were just playing around with trying to get things to compile faster 
> and found that gcc3.x is much slower than gcc 2.x.
> 
> I also discovered gcc(at least on the mac) has some form of precompiled 
> header support which I didn't try to use yet.
> 
> All I can say is gcc is ssslllllllllllooooooooooooowwwwwwwwww.
> 
> faster harddrives help compiling speed too.
> 
> I just can't understand why stl is the main culprit for that much of a 
> slow-down.
> 
> Speaking of slow-down, my brain slowed down so I think I will go to bed 
> now.
> 
> - Ray
> 
> 
> 
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