Running tests faster..

[Alexander Neundorf]

On Tuesday 15 May 2012, David Faure wrote:
> On Sunday 13 May 2012 00:04:43 Alexander Neundorf wrote:
> > Hi,
> > 
> > just a quick hint, maybe you don't know this yet:
> > 
> > You can run tests using "make test".
> > This will run test by test after each other.
> > Internally this simply calls ctest.
> > 
> > If you call ctest manually, you can use extra command line options, and,
> > it supports -jN, as make does.
> > 
> > So, if you have 4 cores, run
> > ctest -j4
> > to have it execute 4 tests in parallel and save time this way.
> 
> Save time...  but at the expense of more failures, if the tests aren't
> ready for this ;-)
> 
> E.g. in kdelibs I get 3 more failures, due to ksycoca-related tests
> creating and removing services that show up in other tests' queries, or
> other tests reading and writing from the same shared files.

There are several properties which can be set on tests:
http://www.cmake.org/cmake/help/v2.8.8/cmake.html#section_PropertiesonTests

among them RUN_SERIAL and DEPENDS (and COST).
Using them it should be possible to avoid such failures (but I haven't used 
this myself yet).

Alex
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