[CMake] Memory usage and configuration time for large project

[Patrick E Gartung]

 Hi,

We have a large c/c++/fortran project, CMSSW, that is built with a custom tool, scram. 

https://github.com/cms-sw/cmssw

The project might move to a cmake based build in the future. The scripts to convert to CmakeLists.tx has been written

https://github.com/cms-sw/cmssw2cmake

Tests show that with the cmake files generated with this script, configuring the project uses up to 1.5GB of ram and takes 11 minutes when using -GMakefiles. Using -GNinja and using the latest cmake, this time can be reduced to 8 minutes.

The project builds 14k object files, 2.2k libraries, ~600 binaries, 500 generated source files with links to ~100 external libraries.

Is this amount of memory usage and time typical for a project of this size?

Patrick Gartung
Fermilab
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