[Qbs] Who compared build times of Qt Creator with CMake and qbs?

[Orgad Shaneh]

du -shc build-qtc-qbs
15G     build-qtc-qbs
15G     total
du -shc build-qtc-cmake
4.0G    build-qtc-cmake
4.0G    total

The number of jobs is default. For qbs it's 40, ninja uses 42.

I tried again without autotests, as Christian suggested:

time qbs -f ../qt-creator/qtcreator.qbs profile:qt-5-11-1
modules.cpp.compilerWrapper:ccache project.withAutotests:false
cold ccache:
real    4m58.383s
user    114m45.623s
sys     15m38.866s

warm cache:
real    1m20.800s
user    16m20.307s
sys     3m57.194s

time cmake ../qt-creator -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_BUILD_TYPE=Debug -G Ninja
real    0m8.256s
user    0m7.425s
sys     0m0.827s

time ninja
cold cache:
real    5m23.413s
user    128m25.457s
sys     16m11.551s

time ninja:
warm cache:
real    0m45.964s
user    7m12.563s
sys     2m23.616s


On Wed, May 15, 2019 at 5:50 PM Vincent Hui <vincenthk007 at gmail.com> wrote:

> How many number of threads were used? Is the number of threads used by Qbs
> equal to the number of threads used by CMake?
>
>
> On Wed, 15 May 2019 at 22:11, Christian Kandeler <Christian.Kandeler at qt.io>
> wrote:
>
>> On Thu, 16 May 2019 02:01:21 +1200
>> Christian Gagneraud <chgans at gmail.com> wrote:
>>
>> > As well, please note that the current CMake doesn't build as much
>> > stuff as the qbs one. Not sure the difference is huge, but you need to
>> > compare "equal jobs".
>>
>> For instance, all autotests are missing from the cmake build, so this
>> alone accounts for a difference of ~100 products. You need to set
>> "project.withAutotests:false" when building with qbs.
>>
>>
>> Christian
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>>
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