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Saving time with CPU_COUNT

The most time consuming task for building the documentation is running LilyPond to build images of music, and there cannot be several simultaneously running lilypond-book instances, so the ‘-j’ make option does not significantly speed up the build process. To help speed it up, the makefile variable ‘CPU_COUNT’ may be set in ‘local.make’ or on the command line to the number of .ly files that LilyPond should process simultaneously, e.g., on a dual core machine:

make -j2 CPU_COUNT=2 doc

The recommended value of ‘CPU_COUNT’ is the number of cores. If the build runs into out-of-memory problems, use a lower number.

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LilyPond — Contributor’s Guide v2.25.8 (development-branch).