Regression testing breakthrough
hintak_leung at yahoo.co.uk
Wed Oct 19 20:01:00 CDT 2011
I have two suggestions -
- git clone has a "--depth" option which does a shallow clone (i.e. with some history removed).
- you can use "git-archive" to export arbitrary commits out as a tar ball dynamically; there is no need to have store a tar ball permanently.
That said, I am doubtful about the usefulness of this in a linux environment, because the system libraries (in the general sense - libjpeg, etc) varies between different linux distros.
--- On Wed, 19/10/11, Joel Holdsworth <joel at airwebreathe.org.uk> wrote:
Alternatively, have you considered doing a .tar.gz of every build snapshot, and placing that on a server somewhere?
e.g. a folder full of
Then one could write a simple wine regression bisect tool that implements similar semantics to git bisect, but would essentially wrap wget. Then in your server you could have an index file which is a list of the sha commit ids.
This would save the user having to clone a 26Gb repository when most of the commits will be irrelevant.
Extra bonus points for doing a better job of compressing the small deltas between binaries*, rather than compressing full wine builds.
* Are binaries deterministic like this? or do they tend to be completely scrambled?
On 18 October 2011 at 09:45 Damjan Jovanovic <damjan.jov at gmail.com> wrote:
> Since the beginning, I've had issues with regression testing. Despite the
> fact it's very useful, it takes forever, it's easy to make a mistake
> (especially during "reverse regression testing"), users find it too long and
> technical, and only a small minority of regressions are ever bisected. And
> several patches need backporting to allow older versions of Wine to compile
> and run on today's make, gcc, and libraries - this is the case even for the
> 1.0.x releases from less than 3 years ago!
> The problem is of course compilation. "configure" takes at least 40 seconds,
> without any way to speed it up on multi-core CPUs. "make" takes > 5 minutes,
> and it's only taking longer as Wine gets bigger. Compilation is
> fundamentally complex and technical to users.
> But what if we had precompiled binaries, and regression testing consisted of
> just running different versions of Wine?
> Wine binaries take up about 122 MB and take over 5 minutes to compile.
> There's now 35770 commits between 36def4af0ca85a1d0e66b5207056775bcb3b09ff
> (Release 1.0) and "origin". That's about 4.4 terrabytes of storage and over
> 4 months of compilation, if each of those versions had to be compiled and
> installed into its own prefix, way beyond what most users are willing or
> able to store or do. Most patches however end up affecting only a few binary
> files in the end, and compiling successive versions allows "make" to be very
> So I've written a tool that compiles Wine and adds each commit's binaries
> into a Git repository. It knows how to compile old versions of Wine
> (currently as far back as 1.0). It knows that commits affecting only
> ANNOUNCE, .gitignore, and files in dll/ or programs/ ending with .c and such
> don't need to go through the endlessly slow "configure", only "make". It is
> stateless: if interrupted, it can resume from the last successful commit. It
> works around bugs in GNU make (you won't believe how many there are...).
> This tool compiled all 35000 or so commits from Wine 1.0 to around 4th
> October 2011 in only 7 days, generating a Git repository of Wine binaries
> that's only 26 gigabytes in size. Regression testing with binaries is a
> pleasure: it takes only a few seconds :-) on each bisection. I bisected a 16
> step regression in just 20 minutes, and most of that time was spent running
> the application and dealing with 2 X-server crashes.
> I haven't figured out how to make the binaries available to users. Few users
> can clone a 26 gigabyte repository, and even fewer places can serve that
> much to multiple users. Maybe Git can compress it further? The other idea I
> had is that users should be able to regression test through a GUI tool.
> Maybe the GUI tool can just download and run the +/- 122 MB binary snapshots
> for specific commits, instead of having the entire binary repository
> Any other ideas? Would you like to see this tool? Can I send an attachment
> with it?
> Thank you
> Damjan Jovanovic
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