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4.5.2 Saving time with the ‘-j’ option
If your system has multiple CPUs, you can speed up compilation by
adding ‘-jX’ to the make command, where
‘X’ is one more than the number of cores you have. For
example, a typical Core2Duo machine would use:
make -j3
If you get errors using the ‘-j’ option, and ‘make’
succeeds without it, try lowering the X value.
Because multiple jobs run in parallel when ‘-j’ is used, it can be difficult to determine the source of an error when one occurs. In that case, running ‘make’ without the ‘-j’ is advised.
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