Hi all,
I have a fairly large project with a root projects that pulls in several
SubProjects, altogether with unit tests its about 313 qbs files that are pulled
in.
Let root.qbs be the root qbs file of my project and depend.qbs a subproject
that many other subprojects depend on.
With a single profile and single config I encounter the following duration for
qbs resolve on my macbook pro with 12 logical CPUs:
1) qbs resolve (clean, new build directory, so includes creating a build
graph): ~1m 25s
2) qbs resolve (no changes): ~0.5 s
3) qbs resolve after "touch root.qbs" (restores build graph): ~1m 15 s
4) qbs resolve after “touch depend.qbs” (restores build graph): ~1m 15s
From the durations i would expect that there is some room for improvement. To
me it seems (by looking at 3 and 4) that qbs rebuilds the whole build graph if
it detects any change to any qbs file in the project. If this is the case i
wonder how difficult it would be to improve this and what the right approach
would be. Maybe looking at “Depends {}” would be enough to determine the “dirty
path”.
Fortunately QtC 4.9.x seems to cache something now since opening a qbs project
will no longer cause a full resolve.
Any ideas or maybe even someone looking at that already?
Best regards,
Maximilian
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