#
# Macros for memory constraints on buildjobs.
# If you happen to have HUGE packages sometimes you need to do
# crazy magic in order to make sure it is most of the time building
# rather than just giving you OOM
#

# m: memory limit in MBs per core; default is 1000
%limit_build(m:) \
    _threads="`/usr/bin/getconf _NPROCESSORS_ONLN`" \
    _core_memory="%{-m:%{-m*}}%{!-m:1000}" \
    echo "Available memory:" \
    cat /proc/meminfo \
    echo "System limits:" \
    ulimit -a \
    echo "System jobs: $_threads" \
    if test "$_threads" -gt 1 ; then \
        mem_per_process="$_core_memory" \
        max_physmem=$(awk '/MemTotal/ { print $2 }' /proc/meminfo) \
        max_swapmem=$(awk '/SwapTotal/ { print $2 }' /proc/meminfo) \
        max_jobs="$((($max_physmem + $max_swapmem) / ($mem_per_process * 1000)))" \
        test "$_threads" -gt "$max_jobs" && _threads="$max_jobs" && echo "Warning: Reducing number of jobs to $max_jobs because of memory limits" \
        test "$_threads" -le 0 && _threads=1 && echo "Warning: Do not use the parallel build at all because of memory limits" \
    fi \
    %global jobs $([[ -n $_threads ]] && echo $_threads || echo "`/usr/bin/getconf _NPROCESSORS_ONLN`") \
    %global _smp_mflags $([[ -n $_threads ]] && echo "-j$_threads" || echo "-j`/usr/bin/getconf _NPROCESSORS_ONLN`") \
    %{nil}