[lldb-dev] Test status (Linux) and run expectation question

[Todd Fiala]

I should also add that as of this moment, we have a several tests (5 or 6
on Linux) that fail intermittently on Linux.  Some of them are due to the
multithreaded test running and attempts by multiple tests to grab resources
(like network ports) without any type of mediator.  We'll be addressing
these in the near future.  I haven't flipped them to skipped since they
tend to run fine in solo mode (running a test at a time), but realistically
we need to either fix them for multithreaded or skip them if they're being
intermittent under load/resource-contention issues.

MacOSX has more tests failing right now (last I checked more like 10+).
 Also, MacOSX tests are not running parallel for some reason we haven't yet
fully diagnosed (but there is a bugzilla bug on it).  I went so far as to
see the thread queues for running the tests were all waiting on the python
subprocess calls appropriately, but only one at a time was actually getting
through.  We'll want to get those tests running in parallel so that they're
more agreeable to run - on Linux I can run the test suite in well under 2
minutes, whereas on MacOSX the combination of fewer cores and no
multithreading means I take 20 - 45 minutes to run the tests.  I'm sure
that's a significant disincentive for running the tests there.




On Mon, Jul 7, 2014 at 8:47 AM, Todd Fiala <tfiala at google.com> wrote:

> Hey Randy,
>
> Great questions.  See a few threads we had on this a while back when I
> started looking into this:
>
> http://lists.cs.uiuc.edu/pipermail/lldb-dev/2014-March/003470.html
> http://lists.cs.uiuc.edu/pipermail/lldb-dev/2014-March/003474.html
>
> > I'm seeing a lot of "UNSUPPORTED" tests when I run on Linux and that
> makes me wonder how much test coverage I'm actually getting if I run those
> tests before submitting patches
>
> Roughly half the tests won't run under Linux on the local test suite.
>  MacOSX has two different mechanisms for handling debug info packaging, so
> they test a large swath of lldb two ways, one of which isn't appropriate
> for Linux.  Those will all show as skipped.
>
> Back in March I did a few things on Linux:
>
>    - Went through all the tests that were entirely disabled.  I turned
>    them on, and if they made sense to run at all on Linux, I saw if they
>    either always failed or always succeeded.  If they did, I turned them on in
>    the normal state (where they are expected to pass).  Those that always
>    failed I marked as XFAIL (expected failure).  Those that passed
>    intermittently for me I marked as skipped to avoid noise and ensured there
>    was at least one bug tracking them in bugzilla.
>    - Enabled code coverage for the local Linux test run.  As expected,
>    much of the remote functionality wasn't covered, but a non-trivial amount
>    of the code was hit by the tests running on Linux.  When I eventually get a
>    build bot up, I'm hoping to include a code coverage run for local tests, so
>    we can get an idea of which code is tested by the local test suite.  (Soon
>    I will have lldb-platform running for Linux x86-based, in which case we can
>    run the remote suite as well).
>
> My goal at the time was to find out just how bad the state of the Linux
> code was w/r/t the MacOSX side.  It ended up being not quite as bad as I
> expected due to some of that info I published.
>
> I have several people on my team now that are working their way through
> the bug database and will be making a point of correcting the more
> egregious issues on Linux.  We're working our way towards getting Android
> working via the lldb-gdbserver (llgs) remote support.
>
> Hope that helps!
>
> Sincerely,
> Todd Fiala
>
>
> On Sun, Jul 6, 2014 at 6:46 PM, Randy Smith <rdsmith at chromium.org> wrote:
>
>>
>> Two questions:
>> * What is the expectation as to which tests will be run before submission
>> of patches?
>> * What is the current status for the Linux tests?  Is anyone already
>> looking at bringing the test coverage to parity with Darwin?
>>
>> I'm seeing a lot of "UNSUPPORTED" tests when I run on Linux and that
>> makes me wonder how much test coverage I'm actually getting if I run those
>> tests before submitting patches (though of the 616 UNSUPPORTED tests on
>> Linux, all but 186 seem to involve dsym, which is probably ok to be
>> unsupported on Linux).  So I'm wondering about what the expectations are
>> for test runs before patch submission, and how easily I can meet those
>> expectations if my primary work environment is Linux.
>>
>> The context is that I'm trying to learn enough about lldb to make real
>> contributions, and I'm doing that by first trying to use it and make it
>> work well as my primary debugger in my usual work environment (Linux
>> targeting chromium).
>>
>> Thanks in advance for any enlightenment ...
>>
>> -- Randy Smith
>>
>>
>>
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>>
>>
>
>
> --
> Todd Fiala | Software Engineer |  tfiala at google.com |  650-943-3180
>



-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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