Parallel builds

A stage for a package (such as a build stage) can take advantage of multiple cores to perform the step. By default, releng-tool will attempt to run as many jobs for a stage equal to the amount of physical cores on the host system. The amount of jobs available for a stage can be configured using the --jobs argument. For example, if a user wishes to override the amount of jobs attempted for stages to two jobs, the following can be used:

releng-tool --jobs 2

If the total number of jobs provided is negative, it will subtract the provided value from the automatic job detection count (to a minimum of one). For example, to use one less job than normally used:

releng-tool --jobs -1

Note that a developer may adjust the amount of jobs allowed for a specific package if a package cannot support parallel processing using the LIBFOO_FIXED_JOBS or LIBFOO_MAX_JOBS package options.