parallelize cmake builds

Author: Yutaro Koike

Dockerfile

@@ -62,7 +62,7 @@ RUN git clone https://github.com/colmap/glomap.git && \
     mkdir build && \
     cd build && \
     mkdir -p /build && \
-    cmake .. -GNinja "-DCMAKE_CUDA_ARCHITECTURES=${CUDA_ARCHITECTURES}" \
+    cmake .. --parallel -GNinja "-DCMAKE_CUDA_ARCHITECTURES=${CUDA_ARCHITECTURES}" \
         -DCMAKE_INSTALL_PREFIX=/build/glomap && \
     ninja install -j1 && \
     cd ~
@@ -74,7 +74,7 @@ RUN git clone https://github.com/colmap/colmap.git && \
     mkdir build && \
     cd build && \
     mkdir -p /build && \
-    cmake .. -GNinja "-DCMAKE_CUDA_ARCHITECTURES=${CUDA_ARCHITECTURES}" \
+    cmake .. --parallel -GNinja "-DCMAKE_CUDA_ARCHITECTURES=${CUDA_ARCHITECTURES}" \
         -DCMAKE_INSTALL_PREFIX=/build/colmap && \
     ninja install -j1 && \
     cd ~