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49 lines
1.6 KiB
Bash
49 lines
1.6 KiB
Bash
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[ -z "${MAKE_JOBS}" ] && MAKE_JOBS=12
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export MAKE_JOBS
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GetPlatform() {
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# Get OS and platform to decide if we need to limit memory usage
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# during the build
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PLATFORM=$(uname -a)
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case "$PLATFORM" in
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"Linux raspberrypi"*) MAX_MEM_PER_JOB=300000;;
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"Linux"*) MAX_MEM_PER_JOB=150000;;
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*) MAX_MEM_PER_JOB=200000 # If platform is not Linux (fallback value)
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esac
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}
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BuildJobsThrottler(){
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echo "Building on Linux : computing number of allowed parallel jobs."
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echo "Maximum allowed RAM memory per job is $MAX_MEM_PER_JOB kB."
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# Get number of CPUs on this target
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# getconf does not exit on Darwin. Use sysctl on Darwin machines.
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CPU_N=$(getconf _NPROCESSORS_ONLN 2>/dev/null || sysctl -n hw.ncpu)
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printf "Number of CPUs is %s and " "$CPU_N"
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# Get remaining RAM that could be used for this build
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FREE_RAM=$(grep MemAvailable /proc/meminfo | sed 's/[^0-9]//g')
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DEFAULT_MAX_MEM_PER_JOB=200000
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[ -z "${MAX_MEM_PER_JOB}" ] && MAX_MEM_PER_JOB="$DEFAULT_MAX_MEM_PER_JOB" # Defensive, prevent devision by 0
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# Assuming we may have many 300MB compilation jobs running in parallel
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MEM_ALLOWED_JOBS=$((FREE_RAM / MAX_MEM_PER_JOB))
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echo "current free RAM allows us to run $MEM_ALLOWED_JOBS jobs in parallel."
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# Set number of build jobs to be run in parallel as the minimum between $MEM_ALLOWED_JOBS and $CPU_N
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export MAKE_JOBS=$((MEM_ALLOWED_JOBS<CPU_N?MEM_ALLOWED_JOBS:CPU_N))
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if [ ${MAKE_JOBS} -lt 1 ]; then
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MAKE_JOBS=8
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fi
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echo "So, the build will run on $MAKE_JOBS job(s)."
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}
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if [ "${OSNAME}" = Linux ]; then
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# Identify current platform
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GetPlatform
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# Define number of parallel jobs depending on ncpus and memory
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BuildJobsThrottler
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fi
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