[Java-gnome-developer] Re: Build time performance boosts

[Laurent M. <la...@ao...>]

>>>>> "Andrew" == Andrew Cowie <an...@op...> writes:

[...]

  Andrew> Now of course, we've pointed out...

  Andrew> (I thought `ant` had something to do with it, but of course,
  Andrew> that's just ant doing a single javac invocation. I stand
  Andrew> corrected)

Ant also has tha ability to run java "in process" when you use Sun's
JDK. So the overhead of an invocation is only paid once.

  Andrew> ...that javac actually has a lot of smarts in it - in fact,
  Andrew> you could hand javac nothing but your top level Main.java
  Andrew> and it would probably reach out and compile your entire
  Andrew> application.

  Andrew> [for a long time I didn't trust that, but then I noticed it
  Andrew> doing it for me and covering my ass when I'd in fact made a
  Andrew> Makefile mistake, so now I feel better about it!]

[...]

  Andrew> I've attached the simple diff (and again, in patch form)
  Andrew> that shows the makefile differences. As I said, all it does
  Andrew> is loose the individual compile steps.

  Andrew> I'm not sure that this is a good idea, overall...

  Andrew> obviously, if you're hacking on the bindings then you don't
  Andrew> really want to wait even 4 minutes for a recompile. But If
  Andrew> you've already built it, and you're only working on the Java
  Andrew> side of things, then 1 minute isn't so bad for a full
  Andrew> rebuild [shit, you probably have to make install before you
  Andrew> test it anyway]

Given my optimized includes, "make nativelib" does not win anything
from your patch. So I would personnaly reject that part. Also you can
easily win some time in the "rebuild one java class" case by using $?
instead of $^ in the javac invocation.

I've ended up making symlinks to my build dir so that I don't have to
"sudo make install" every time I rebuild.

  Andrew> ...but 4 minutes beats the hell out of 18 minutes if you're
  Andrew> just an end user building the package for installation on
  Andrew> your system.

  Andrew> Food for thought.



-- 
Laurent Martelli
la...@ao...                                Java Aspect Components
http://www.aopsys.com/                          http://jac.objectweb.org