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From Laura Dean <lgd...@cyrusinnovation.com>
Subject Re: junit tests running slower in 1.8 than in 1.7
Date Fri, 23 Jul 2010 14:21:33 GMT
I switched our real project to forkmode="perTest" and found that it runs
even slower (much slower), so it's clearly doing better than one VM per
test.  (I haven't ruled out something like one VM per class, though.)  I
won't have time to play more with the code until Monday, but I will look at
it then.

Laura

On Fri, Jul 23, 2010 at 1:10 AM, Stefan Bodewig <bodewig@apache.org> wrote:

> On 2010-07-22, Laura Dean wrote:
>
> > My team has a unit test suite that ran in about a minute and a half
> > with ant 1.6.5 (and 1.7.1), but now takes over 4 minutes with ant
> > 1.8.1 (or 1.8.0).  Has anyone else had this problem?  The closest I've
> > found via google is here, but it doesn't shed much light on the
> > subject:
>
> > http://netbeans.org/bugzilla/show_bug.cgi?id=182263
>
> Ant 1.8.0 changed some parts of the process execution logic to adapt to
> problems with hanging grandchild processes on Windows.  This changes
> have a side-effect (which we cannot seem to avoid) that causes any
> forked process to use up at least about half a second.  With 1.8.1 the
> same logic changes have been applied to other OSes as well.
>
> So if you build process was forking a lot of small processes, a major
> slowdown is to be expected.
>
> > We're running junit with fork=yes and forkmode=once.
>
> forkmode="once" should just create a single new process and you'd only
> be paying the overhead once - not for each test.  This is the first
> thing I'd look into, makesure there really only is a single VM forked.
>
> > For the curious, I've created a simplified project here:
> > http://web.mit.edu/lgdean/Public/test-project.zip .
>
> I'll look into it.
>
> Stefan
>
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