[Ant-contrib-developers] Re: Patch: cpptasks dependency analysis up to 1000 times faster

[Helge S. <Hel...@gm...>]

On Thu, 28 Aug 2003, Dominique Devienne wrote:
>
> This is what I've seen from applying the patch, in one of my projects,
> with 1569 .cpp, 1944 .h, 48 .hpp, so a good size project already, totaling
> 1,178,784 lines of code (including comments).
>
>                      First Full Analysis    Subsequent Analysis
> Official CppTasks:     63 seconds +/- 2       24 seconds +/- 1
> Patched  CppTasks:     61 seconds +/- 0       19 seconds +/- 1
>
> Note that this timing is the full build time, including Ant startup, and
> recursing the directory tree, since the projects is composed of 30+ libs,
> as well deciding that 423 Java files are up to date.
>
> Compare this to the full time to build (a few seconds taken by Java
> compile): 21 minutes 28 seconds.

OpenSHORE (http://sf.net/projects/openshore) has 321 .cpp, 419 .h and 249
.java source files. It has 210,571 lines of code (including comments).
Here are my timings for the whole project (27 C++ libs, without Java
translation):

                     First Full Analysis    Subsequent Analysis
Official CppTasks:    271 seconds +/- 2      268 seconds +/- 0
Patched  CppTasks:      7 seconds +/- 1        6 seconds +/- 0

Full rebuild (target shore-server): 9 minutes 57 seconds.

> So all in all, I'm seeing very little benefit from this myself.

Ok, but you have no slow down.

> The project I've tested the patch against is very mature, and has very
> few headers including unnecessary headers (forward prototyping of
> everything used as pointers/references).

Headers of OpenSHORE contains many C++ template implementations, so simple
forward declarations aren't possible.

> That's certainly not 1000 times faster :(

Better then slow down :-)

	Helge

-- 
Helge Schulz	http://www.openshore.org