[webkit-dev] Running pixel tests on build.webkit.org

Jeremy Orlow jorlow at chromium.org
Mon Jan 11 09:06:30 PST 2010

On Fri, Jan 8, 2010 at 9:52 AM, Jeremy Orlow <jorlow at chromium.org> wrote:

> Plan 3 seems like the best (and simplest) one until the infrastructure for
> the others (and/or a champion for fixing currently failing tests) is
> available.
> What would it take to go with plan 3?  I guess someone needs to rebaseline
> everything that's currently failing, check them in, and then someone (like
> bdash?) needs to flip a switch on the bots...?  Did I miss anything?
> Are there instructions on how to do the rebaselining anywhere?  I've only
> ever created pixel baselines for Chromium before (where we have a pretty
> neat tool that pretty much does it for you).

Does anyone know?

I'm happy to do the rebaselining if someone can tell me how and we agree to
turn pixel tests on on the bots.

> On Fri, Jan 8, 2010 at 9:23 AM, Pam Greene <pam at chromium.org> wrote:
>> And one very quick, short-term solution:
>> 3. Generate new pixel results to match the current behavior, and check
>> them in as hypothetically correct.
>> And of course if someone notices an existing problem and fixes it, they
>> check in corrected images then. It doesn't help find current problems, but
>> those are being missed now anyway. It does let the tests be run again
>> approximately immediately, even faster than waiting for test expectations
>> functionality, so we can catch regressions moving forward.
>> - Pam
>> On Thu, Jan 7, 2010 at 5:01 PM, Ojan Vafai <ojan at chromium.org> wrote:
>>> On Thu, Jan 7, 2010 at 10:22 AM, Darin Adler <darin at apple.com> wrote:
>>>> On Jan 7, 2010, at 10:19 AM, Dimitri Glazkov wrote:
>>>> > Are we planning to run pixel tests on the build bots?
>>>> If we can get them green, we should. It’s a lot of work. We need a
>>>> volunteer to do that work. We’ve tried before.
>>> Two possible long-term solutions come to mind:
>>> 1. Turn the bots orange on pixel failures. They still need fixing, but
>>> are not as severe as text diff failures. I'm not a huge fan of this, but
>>> it's an option.
>>> 2. Add in a concept of expected failures and only turn the bots red for
>>> *unexpected* failurs. More details on this below.
>>> In chromium-land, there's an expectations file that lists expected
>>> failures and allows for distinguishing different types of failures (e.g.
>>> IMAGE vs. TEXT). It's like Skipped lists, but doesn't necessarily skip the
>>> test. Fixing the expected failures still needs doing of course, but can be
>>> done asynchronously. The primary advantage of this approach is that we can
>>> turn on pixel tests, keep the bots green and avoid further regressions.
>>> Would something like that make sense for WebKit as a whole? To be clear,
>>> we would be nearly as loathe to add tests to this file as we are about
>>> adding them to the Skipped lists. This just provides a way forward.
>>> While it's true that the bots used to be red more frequently with pixel
>>> tests turned on, for the most part, there weren't significant pixel
>>> regressions. Now, if you run the pixel tests on a clean build, there are a
>>> number of failures and a very large number of hash-mismatches that are
>>> within the failure tolerance level.
>>> -Ojan
>>> For reference, the format of the expectations file is something like
>>> this:
>>> // Fails the image diff but not the text diff.
>>> fast/forms/foo.html = IMAGE
>>> // Fails just the text diff.
>>> fast/forms/bar.html = TEXT
>>> // Fails both the image and text diffs.
>>> fast/forms/baz.html = IMAGE+TEXT
>>> // Skips this test (e.g. because it hangs run-webkit-tests or causes
>>> other tests to fail).
>>> SKIP : fast/forms/foo1.html = IMAGE
>>> _______________________________________________
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>>> webkit-dev at lists.webkit.org
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