On 10-01-18 11:34:44, Ville Skyttä wrote:
So instead of modifying specfiles, one can do something like this in
config_opts['macros']['%_smp_mflags'] = '-j3'
Unless `rpmbuild --showrc` shows a bad definition for _smp_mflags,
you're probably better off letting the macro decide. IME, using a
number larger than the actual number of CPUs slows the build a lot, due
to cache thrashing. Modern CPUs perform well only with hot caches, and
each switch to the "other" build process will replace the cache
The OP said that rpmbuild was using the CPUs properly and ran fast, but
earlier parts of mock were not and ran slowly, and take most of the
time. He indicated that most of the time is spent extracting the build
root from the cache.