chore: build contracts and protocol circuits sequentially if not enou…

…gh ram (#5499)

#5426 but for building noir projects.

noir-projects/bootstrap.sh

@@ -22,9 +22,33 @@ g="\033[32m"  # Green
 b="\033[34m"  # Blue
 r="\033[0m"   # Reset
 
-((cd "./noir-contracts" && ./bootstrap.sh) > >(awk -v g="$g" -v r="$r" '{print g "contracts: " r $0}')) &
-((cd "./noir-protocol-circuits" && ./bootstrap.sh) > >(awk -v b="$b" -v r="$r" '{print  b "protocol-circuits: " r $0}')) &
+AVAILABLE_MEMORY=0
+
+case "$(uname)" in
+  Linux*)
+    # Check available memory on Linux
+    AVAILABLE_MEMORY=$(awk '/MemFree/ { printf $2 }' /proc/meminfo)
+    ;;
+  *)
+    echo "Parallel builds not supported on this operating system"
+    ;;
+esac
+# This value may be too low.
+# If builds fail with an amount of free memory greater than this value then it should be increased.
+MIN_PARALLEL_BUILD_MEMORY=32000000
+
+if [[ AVAILABLE_MEMORY -lt MIN_PARALLEL_BUILD_MEMORY ]]; then
+  echo "System does not have enough memory for parallel builds, falling back to sequential"
+  ./noir-contracts/bootstrap.sh
+  ./noir-protocol-circuits/bootstrap.sh
+else
+  ((./noir-contracts/bootstrap.sh) > >(awk -v g="$g" -v r="$r" '{print g "contracts: " r $0}')) &
+  ((./noir-protocol-circuits/bootstrap.sh) > >(awk -v b="$b" -v r="$r" '{print  b "protocol-circuits: " r $0}')) &
+
+  for job in $(jobs -p); do
+    wait $job || exit 1
+  done
+fi
+
+
 
-for job in $(jobs -p); do
-  wait $job || exit 1
-done