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From Laura Dean <lgd...@cyrusinnovation.com>
Subject Re: junit tests running slower in 1.8 than in 1.7
Date Tue, 27 Jul 2010 22:21:43 GMT
I tried a few more things, with the following results:

* On windows, Ant 1.8 runs the tests slower regardless of JDK version
(among 1.5.0_11, 1.6.0_17, and 1.6.0_21).

* If I copy ant-junit.jar to the project directory and add it to the
classpath, nothing changes.  The tests still run slower in 1.8.

* Like you, I also couldn't reproduce the problem under linux.

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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>>
>>
>

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