Crank down MAKEOPTS jobs if MAKEOPTS="-jN" is too high for the amount of RAM available (uses amount declared as needed in the ebuild). Typically should be ~2GB per job.
Bug: https://bugs.gentoo.org/570534 Signed-off-by: Sam James <s...@gentoo.org> --- eclass/check-reqs.eclass | 42 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 39 insertions(+), 3 deletions(-) diff --git a/eclass/check-reqs.eclass b/eclass/check-reqs.eclass index 2130e2e349141..8c4adc8b4f121 100644 --- a/eclass/check-reqs.eclass +++ b/eclass/check-reqs.eclass @@ -43,6 +43,8 @@ case ${EAPI} in *) die "${ECLASS}: EAPI=${EAPI:-0} is not supported" ;; esac +inherit multiprocessing + EXPORT_FUNCTIONS pkg_pretend pkg_setup if [[ ! ${_CHECK_REQS_ECLASS} ]]; then @@ -53,6 +55,13 @@ _CHECK_REQS_ECLASS=1 # @DESCRIPTION: # How much RAM is needed? Eg.: CHECKREQS_MEMORY=15M +# @ECLASS-VARIABLE: CHECKREQS_MEMORY_MANGLE_JOBS +# @USER_VARIABLE +# @DESCRIPTION: +# Allow packages to reduce the number of multiprocessing (e.g. make, ninja) jobs +# to lower memory usage. +: ${CHECKREQS_MEMORY_MANGLE_JOBS=yes} + # @ECLASS-VARIABLE: CHECKREQS_DISK_BUILD # @DEFAULT_UNSET # @DESCRIPTION: @@ -346,9 +355,36 @@ _check-reqs_memory() { eend 0 else eend 1 - _check-reqs_unsatisfied \ - ${size} \ - "RAM" + + # Has the user allowed us to mangle their MAKEOPTS? + if [[ ${CHECKREQS_MEMORY_MANGLE_JOBS} == "yes" ]] ; then + local jobs=$(makeopts_jobs) + + local estimated_max_memory=$((${actual_memory}/$(_check-reqs_get_kibibytes 1G))) + if [[ $((jobs*2)) -gt ${estimated_max_memory} ]] ; then + # Number of jobs exceeds RAM/2GB, so clamp it. + local new_jobs=$(($(_check-reqs_get_number ${estimated_max_memory}G)*10/20)) + + # This might _still_ be too big on small machines. Give up in such cases. + # (Users can still set the do nothing variable which is independent of this.) + if [[ $((new_jobs*2)) -gt ${estimated_max_memory} ]] ; then + _check-reqs_unsatisfied \ + ${size} \ + "RAM" + else + # The clamped jobs seem to be enough to satisfy the check-reqs requirement from the ebuild. + ewarn "Clamping MAKEOPTS jobs to -j${new_jobs} to reduce memory usage" + ewarn "Compiler jobs may use around ~2GB each: https://wiki.gentoo.org/wiki/MAKEOPTS"; + ewarn "To disable this, set CHECKREQS_MEMORY_MANGLE_JOBS=no." + + MAKEOPTS+=" -j${new_jobs}" + fi + fi + else + _check-reqs_unsatisfied \ + ${size} \ + "RAM" + fi fi else eend 1 -- 2.34.1
