make.sh: Calculate MAKETUNING depending on available memory

[ipfire-2.x.git] / tools / make-functions

diff --git a/tools/make-functions b/tools/make-functions
index 1ff4613f3ea5c435c3a856cb6a2f6bc6dce85f3c..9cf2fcfb472f0f10da31c293e06fa1e99539924a 100644 (file)
--- a/tools/make-functions
+++ b/tools/make-functions
@@ -60,6 +60,10 @@ WARN="\\033[1;35m"
 FAIL="\\033[1;31m"
 NORMAL="\\033[0;39m"
 
+system_processors() {
+       getconf _NPROCESSORS_ONLN 2>/dev/null || echo "1"
+}
+
 system_memory() {
        local key val unit
 
@@ -146,6 +150,26 @@ configure_build() {
        fi
 
        CXXFLAGS="${CFLAGS}"
+
+       # Determine parallelism
+       if [ -z "${MAKETUNING}" ]; then
+               # We assume that each process consumes about
+               # 192MB of memory. Therefore we find out how
+               # many processes fit into memory.
+               local mem_max=$(( ${HOST_MEM} / 192 ))
+
+               local processors="$(system_processors)"
+               local cpu_max=$(( ${processors} * 2 ))
+
+               local parallelism
+               if [ ${mem_max} -lt ${cpu_max} ]; then
+                       parallelism=${mem_max}
+               else
+                       parallelism=${cpu_max}
+               fi
+
+               MAKETUNING="-j${parallelism}"
+       fi
 }
 
 configure_build_guess() {