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From Mark Miller <>
Subject Re: [jira] Commented: (LUCENE-1844) Speed up junit tests
Date Wed, 25 Nov 2009 18:14:24 GMT
junit 4 parallelization is still in its infancy. I think the docs for it
are just in the changes file that it was first released with. That
version had severe bugs that made it almost unusable - I think thats
mostly fixed in a newer release. There is also a much better impl of one
of the key classes (I think they call it computer) written by someone
else that will eventually go into the code base I think (written by the
guy(s) that I think found/fixed the initial buggy-ness) - essentially, I
think its still unbaked.

Here are some docs from the release notes of 4.6:

Thats also an issue - it arrived only in 4.6 - so this would need to be
optional unless we bumped up our req from 4 - and it really requires at
least 4.7 for the fixes (if everything is even fixed).

You also have to setup which tests run in parallel by hand essentially.
No ant task to help with this last I looked. So it will probably end up
being an alternate way to run the tests initially (at best).

- Mark

Erick Erickson wrote:
> They're ready to go, but at Uwe's suggestion, I've been waiting for
> 3.0 to get settled before prompting someone to apply this patch. I was
> going to generate a new patch for this and for 2037 (junit4 tests)
> just to make sure they were easy to apply. But if you're willing, the
> patches are already attached to the JIRA issues. Do note that the
> decision in MinBooleanShouldMatch to stop checking the query after 100
> rather than checking all 1,000 is included in the patch....
> Do you want to apply the patches or should I regenerate? It's no big
> deal to regenerate them and I'll have a better feel for reconciling
> any conflicts. I don't know whether there even *are* any conflicts,
> but just in case....
> For my info, though, if I have a more recent patch that *replaces* an
> earlier patch, especially one that hasn't yet been applied, is it
> preferred to delete the earlier patch when providing a new one?
> I'm not pleased with the Junit4 documentation, most of what I've been
> able to glean has come from brave souls blogging. Does anyone have a
> gold mine or is it as hit-or-miss as I think? There are hints of
> parallelization capabilities in Junit4, but I'm having a hard time
> finding anything in much depth..... The Junit website is pathetic, I
> can't even find 4.7 javadocs, it keeps giving me 4.5, as evidenced by
> no @Rule docs or @Intercept. And no version information in the
> javadocs..... Or I'm completely missing the boat.... I was thinking
> about getting the entire project over the weekend and generating my
> own if I have the time
> Erick
> On Wed, Nov 25, 2009 at 11:49 AM, Michael McCandless (JIRA)
> < <>> wrote:
>        [
>     <>
>     ]
>     Michael McCandless commented on LUCENE-1844:
>     --------------------------------------------
>     Is this ready to go in?  I'd really love to see unit tests run
>     faster :)
>     > Speed up junit tests
>     > --------------------
>     >
>     >                 Key: LUCENE-1844
>     >                 URL:
>     >             Project: Lucene - Java
>     >          Issue Type: Improvement
>     >            Reporter: Mark Miller
>     >         Attachments: FastCnstScoreQTest.patch,
>     hi_junit_test_runtimes.png, LUCENE-1844.patch
>     >
>     >
>     > As Lucene grows, so does the number of JUnit tests. This is
>     obviously a good thing, but it comes with longer and longer test
>     times. Now that we also run back compat tests in a standard test
>     run, this problem is essentially doubled.
>     > There are some ways this may get better, including running
>     parallel tests. You will need the hardware to fully take
>     advantage, but it should be a nice gain. There is already an issue
>     for this, and Junit 4.6, 4.7 have the beginnings of something we
>     might be able to count on soon. 4.6 was buggy, and 4.7 still
>     doesn't come with nice ant integration. Parallel tests will come
>     though.
>     > Beyond parallel testing, I think we also need to concentrate on
>     keeping our tests lean. We don't want to sacrifice coverage or
>     quality, but I'm sure there is plenty of fat to skim.
>     > I've started making a list of some of the longer tests - I think
>     with some work we can make our tests much faster - and then with
>     parallelization, I think we could see some really great gains.
>     --
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