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From Russell Gold <>
Subject Re: Any reason ant should compile faster?
Date Wed, 24 Jul 2013 20:40:56 GMT
Oh, you underestimate the coupling of this code. Yes, there are packages, but the classes in
those packages reference one another willy-nilly. It's not a problem with recompiling - it's
that there don't appear to be any good, sensible subset of classes in this group of 10,000
or so which can be compiled on their own. This set of 4000 appears to be the minimum of what's

And worse, it appears that we published the main classes responsible for doing the coupling
- and our customers use them in their own scripts.

The architect responsible for this mess left the company ten years ago, shortly after putting
it in place over the objections of most of the senior staff, and we haven't been able to remove


On Jul 24, 2013, at 3:28 PM, Ron Wheeler <> wrote:

> On 24/07/2013 12:35 PM, Russell Gold wrote:
>> I wish I could break it up. Among the problems with this code is the extreme bit
of coupling. The scripts list 300 files to compile because that's all that we would have wanted,
but they pull in other files, which pull in yet others. Trying to compile this fairly small
subsystem winds up building about a third of the entire project.
> Pulling in classes does not mean recompiling them.
> Once you have compiled the dependencies and aggregate them into jars, they can be referenced
without recompiling them.
> This will speed things up tremendously.
> Do you at least have packages to use as a starting point?
> Ron
>> But I will definitely look at the options and see what I can learn from them; thanks
for the suggestions.
>> Russ
>> On Jul 24, 2013, at 12:31 PM, Wayne Fay <> wrote:
>>>> The case I'm wondering about now is one where we have over 10,000
>>>> source files in a directory, and compile them bit-by-bit. One step specifies
>>>> about 300 files, and thanks to javac dependency logic, actually compiles
>>>> about 4000 files in ant.
>>> Is there any way you can break that into 10 projects with 1k files
>>> each, or 20 projects with 500 files each, etc? I have found dramatic
>>> improvements in (Java compiling) speed as a result of breaking huge
>>> projects like this into a series of much smaller projects with
>>> dependencies between the projects etc as needed.
>>> Having said that, 20 seconds for 4k files sounds pretty quick! Sorry
>>> but I'm not sure how to explain the 20 sec vs 90 sec results you're
>>> experiencing. I'd check versions of everything and flags sent to
>>> compilers etc via -X.
>>> Wayne
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>> -----------------
>> Come read my webnovel, Take a Lemon <>,
>> and listen to the Misfile radio play <>!
> -- 
> Ron Wheeler
> President
> Artifact Software Inc
> email:
> skype: ronaldmwheeler
> phone: 866-970-2435, ext 102
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Come read my webnovel, Take a Lemon <>, 
and listen to the Misfile radio play <>!

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