Qt Creator uses only 50% CPU on Build

Question

Win 10 Professional x64
Qt 5.15.5 msvc2019
Qt Creator 9.0.2

clang version 12.0.0  
Target: x86_64-pc-windows-msvc  
Thread model: posix

CPU usage is about 50% during large project build after change processor from Core i5-7400 to core i5-12400F. How can one achieve about 100% CPU usage?

(1) right click the graph > Change Graph to > Logical Processors; (2) compilation is usually an IO bound task so maxing CPU is unusual. — Richard Critten, Mar 26 '23 at 13:23
Perhaps the build system produces enough work for like 6 logical processors ... therefore 4 of 7600 get occupied but not 12 of 12400F — Öö Tiib, Mar 26 '23 at 13:33
Are there enough files to build that don't depend on eachother in order to utilize all cores? — Jesper Juhl, Mar 29 '23 at 14:54
@JesperJuhl yes, there are enough things to to utilize all the cores, see my answer — Vladimir Bershov, Mar 29 '23 at 16:55

Vladimir Bershov · Accepted Answer · 2023-03-29T16:51:54.890

0

Solved by specifying Parallel jobs count in the Build Settings.

Rebuild subproject with jobs=4 (average CPU load about 58 %): time: 03:27
Rebuild subproject with jobs=8 (CPU load 100%), time: 02:18.

edited Mar 29 '23 at 16:51

answered Mar 29 '23 at 14:29

Vladimir Bershov

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Qt Creator uses only 50% CPU on Build

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