[Releasing] Testing and verification of Alpha package

[shane.kearns at accenture.com]

> -----Original Message-----
> From: Rohan McGovern [mailto:rohan.mcgovern at nokia.com]
> Sent: 18 March 2012 23:29
> To: Kearns, Shane
> Cc: releasing
> Subject: Re: [Releasing] Testing and verification of Alpha package
>
> shane.kearns at accenture.com said:
> > Windows 7 MSVC2010 x64 build issues:
> >
> > "configure -opensource -confirm-license"
> >
> > Jom (current jom-stable downloaded today) cannot parallelise the
> build properly. Every test is built strictly sequentially, therefore
> only one core is in use for most of the build time.
>
> If I understand correctly, jom does not do true recursive parallelism
> as
> GNU make does[1]; I think it would parallelize within a subdir, but
> would
> not build multiple subdirs concurrently.  I hope to be corrected if I'm
> wrong.

Mingw32-make doesn't support that, which was my original reason for switching to msvc + jom for windows builds.
On Qt4 with jom 0.8.8, jom gave the impression of 100% CPU usage through most of the build (I'll need to try that old version again)

However, my normal usage was to build src/ first (configure, cd src, qmake, jom)
And build tests/auto/ only when there was something to test.

> This means it indeed gives quite poor performance when building
> hundreds
> of projects with 1-2 source files each ... like unit tests :(

This should be able to create 16 jom instances each building a different test.
With the flat hierarchy of Qt 4, running jom from tests/auto would have worked like this if it's not recursively parallel
And with Qt 5 I wouldn't have noticed so far, due to building either tests/auto/corelib or tests/auto/network depending what I'm testing (or "nmake check" which is expected to be slow and non parallel)

But if there's one make or jom instance building all of tests/ it will be expected to take a long time.

Proper parallelism requires a non recursive makefile.
(Though you pay a higher cost at the makefile generation step)

> >
> > -          Repeatable when running again on the failed build
> > Jom has no console output during the build, it is all dumped at the
> end when the build failed. (output stopped when configuring multimedia,
> at end of build the scrollback buffer was full)
> >
>
> Was that jom 1.0.11 ?  Several jom versions had output buffering issues
> and this is one reason why jom was not upgraded in Qt Project CI for a
> long time.  But these problems seemed to have been fixed by now in my
> testing.

Yes, 1.0.11

> You can file jom bugs against QTCREATORBUG and they seem to have a good
> chance of being looked at.
>
> [1] incidentally, http://mad-scientist.net/make/jobserver.html is an
> interesting read about GNU make -j .

That implementation using unix signals probably explains why it's not in mingw32-make.

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