Ignore one processing unit

Running this on Linux regularly crashes applications. For context, I have Goland up and running which eats up a ton of memory. Nevertheless, leaving one unit free so users can do something else without the risk of crashing their programs seems like a good idea.

Makefile

@@ -95,7 +95,7 @@ build_openvino_package:
 	cd build
 	sudo rm -rf *
 	sudo cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D ENABLE_VPU=ON -D ENABLE_MKL_DNN=ON -D ENABLE_CLDNN=ON ..
-	sudo $(MAKE) -j $(shell nproc --all)
+	sudo $(MAKE) -j $(shell nproc --all --ignore 1)
 	sudo touch VERSION
 	sudo mkdir -p src/ngraph
 	sudo cp thirdparty/ngraph/src/ngraph/version.hpp src/ngraph
@@ -108,7 +108,7 @@ build:
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -119,7 +119,7 @@ build_raspi:
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_NEON=ON -D ENABLE_VFPV3=ON -D WITH_JASPER=OFF -D OPENCV_GENERATE_PKGCONFIG=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -130,7 +130,7 @@ build_raspi_zero:
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_VFPV2=ON -D WITH_JASPER=OFF -D OPENCV_GENERATE_PKGCONFIG=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -169,7 +169,7 @@ build_jetson:
 		-D WITH_V4L=ON \
 		-D WITH_LIBV4L=ON \
 		-D OPENCV_GENERATE_PKGCONFIG=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -180,7 +180,7 @@ build_nonfree:
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DOPENCV_ENABLE_NONFREE=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -191,7 +191,7 @@ build_openvino:
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D ENABLE_CXX11=ON -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D WITH_INF_ENGINE=ON -D InferenceEngine_DIR=/usr/local/dldt/inference-engine/build -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DOPENCV_ENABLE_NONFREE=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -201,19 +201,19 @@ build_cuda:
 	mkdir build
 	cd build
 	rm -rf *
-	cmake -j $(shell nproc --all) -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_CUDA=ON -DENABLE_FAST_MATH=1 -DCUDA_FAST_MATH=1 -DWITH_CUBLAS=1 -DCUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ -DBUILD_opencv_cudacodec=OFF -D WITH_CUDNN=ON -D OPENCV_DNN_CUDA=ON -D CUDA_GENERATION=Auto ..
-	$(MAKE) -j $(shell nproc --all)
+	cmake -j $(shell nproc --all --ignore 1) -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_CUDA=ON -DENABLE_FAST_MATH=1 -DCUDA_FAST_MATH=1 -DWITH_CUBLAS=1 -DCUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ -DBUILD_opencv_cudacodec=OFF -D WITH_CUDNN=ON -D OPENCV_DNN_CUDA=ON -D CUDA_GENERATION=Auto ..
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
-# Build OpenCV staticly linked
+# Build OpenCV statically linked
 build_static:
 	cd $(TMP_DIR)opencv/opencv-$(OPENCV_VERSION)
 	mkdir build
 	cd build
 	rm -rf *
 	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=OFF -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -DWITH_JASPER=OFF -DWITH_QT=OFF -DWITH_GTK=OFF -DWITH_FFMPEG=OFF -DWITH_TIFF=OFF -DWITH_WEBP=OFF -DWITH_PNG=OFF -DWITH_1394=OFF -DWITH_OPENJPEG=OFF -DOPENCV_GENERATE_PKGCONFIG=ON ..
-	$(MAKE) -j $(shell nproc --all)
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -
 
@@ -223,8 +223,8 @@ build_all:
 	mkdir build
 	cd build
 	rm -rf *
-	cmake -j $(shell nproc --all) -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D ENABLE_CXX11=ON -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D WITH_INF_ENGINE=ON -D InferenceEngine_DIR=/usr/local/dldt/inference-engine/build -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_CUDA=ON -DENABLE_FAST_MATH=1 -DCUDA_FAST_MATH=1 -DWITH_CUBLAS=1 -DCUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ -DBUILD_opencv_cudacodec=OFF -D WITH_CUDNN=ON -D OPENCV_DNN_CUDA=ON -D CUDA_GENERATION=Auto ..
-	$(MAKE) -j $(shell nproc --all)
+	cmake -j $(shell nproc --all --ignore 1) -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D ENABLE_CXX11=ON -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D WITH_INF_ENGINE=ON -D InferenceEngine_DIR=/usr/local/dldt/inference-engine/build -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=NO -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D WITH_JASPER=OFF -D WITH_TBB=ON -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_CUDA=ON -DENABLE_FAST_MATH=1 -DCUDA_FAST_MATH=1 -DWITH_CUBLAS=1 -DCUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ -DBUILD_opencv_cudacodec=OFF -D WITH_CUDNN=ON -D OPENCV_DNN_CUDA=ON -D CUDA_GENERATION=Auto ..
+	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall
 	cd -