From 7c7b3032eb5fa8fb0332b7e91086800d3bcb398e Mon Sep 17 00:00:00 2001
From: Marco van Hulten <Marco.van.Hulten@uni-bonn.de>
Date: Fri, 15 Aug 2025 13:28:57 +0200
Subject: [PATCH 1/4] Enable CMake parallel build

For components using the CMake build tool; tested with ParFlow.

Four threads appears to be the sweet spot.  Walltimes (ParFlow only):

-j 1 -> 164 s
-j 2 -> 100 s
-j 4 ->  64 s
-j 8 ->  50 s
---
 build_tsmp2.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build_tsmp2.sh b/build_tsmp2.sh
index 7edd729..89ef37e 100755
--- a/build_tsmp2.sh
+++ b/build_tsmp2.sh
@@ -320,7 +320,7 @@ message "== CMAKE GENERATE PROJECT finished"
 message "CMAKE build:"
 message "cmake --build ${cmake_build_dir} |& tee -a $build_log"
 message "== CMAKE BUILD start"
-cmake --build ${cmake_build_dir} |& tee -a $build_log
+cmake --build ${cmake_build_dir} --parallel 4 |& tee -a $build_log
 message "== CMAKE BUILD finished"
 
 message "CMAKE install:"

From d5e8316cc0a5b2532449e9e06901aea75b6203a1 Mon Sep 17 00:00:00 2001
From: Marco van Hulten <Marco.van.Hulten@uni-bonn.de>
Date: Mon, 18 Aug 2025 16:14:19 +0200
Subject: [PATCH 2/4] Revert "Enable CMake parallel build"

This reverts commit 7c7b3032eb5fa8fb0332b7e91086800d3bcb398e, because it
would pose a problem for coupled builds.
---
 build_tsmp2.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build_tsmp2.sh b/build_tsmp2.sh
index 89ef37e..7edd729 100755
--- a/build_tsmp2.sh
+++ b/build_tsmp2.sh
@@ -320,7 +320,7 @@ message "== CMAKE GENERATE PROJECT finished"
 message "CMAKE build:"
 message "cmake --build ${cmake_build_dir} |& tee -a $build_log"
 message "== CMAKE BUILD start"
-cmake --build ${cmake_build_dir} --parallel 4 |& tee -a $build_log
+cmake --build ${cmake_build_dir} |& tee -a $build_log
 message "== CMAKE BUILD finished"
 
 message "CMAKE install:"

From b36badf69631f2983decbf0e5c1a44e3dec53c18 Mon Sep 17 00:00:00 2001
From: Marco van Hulten <Marco.van.Hulten@uni-bonn.de>
Date: Mon, 18 Aug 2025 16:56:46 +0200
Subject: [PATCH 3/4] Enable CMake parallel build as a user option

Resolves: #62, #89
---
 build_tsmp2.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/build_tsmp2.sh b/build_tsmp2.sh
index 7edd729..609c623 100755
--- a/build_tsmp2.sh
+++ b/build_tsmp2.sh
@@ -33,6 +33,7 @@ function help_tsmp2() {
   echo "  --install_dir    Set install dir cmake, if not set bin/<SYSTEMNAME>_<model-id> is used. Model executables and libraries will be installed here"
   echo "  --clean_first    Delete build_dir if it already exists"
   echo "  --env            Set model environment."
+  echo "  --max_jobs       Set the maximum number of jobs to build the code, if not set compilation is serial."
   echo ""
   echo "Example: $0 --ICON --eCLM --ParFlow"
   exit 1
@@ -124,6 +125,7 @@ while [[ "$#" -gt 0 ]]; do
     --build_dir) build_dir="$2"; shift ;;
     --install_dir) install_dir="$2"; shift ;;
     --env) env="$2"; shift ;;
+    --max_jobs) max_jobs="$2"; shift ;;
     *) echo "Unknown parameter passed: $1"; exit 1 ;;
   esac
   shift
@@ -290,6 +292,8 @@ else
 fi
 mkdir -p "${cmake_install_dir}"
 
+cmake_max_jobs="${max_jobs:-1}"
+
 #
 # 5. CMake configure
 #
@@ -318,7 +322,7 @@ message "== CMAKE GENERATE PROJECT finished"
 # 6. CMake build and install
 #
 message "CMAKE build:"
-message "cmake --build ${cmake_build_dir} |& tee -a $build_log"
+message "cmake --build ${cmake_build_dir} --parallel ${cmake_max_jobs} |& tee -a $build_log"
 message "== CMAKE BUILD start"
 cmake --build ${cmake_build_dir} |& tee -a $build_log
 message "== CMAKE BUILD finished"

From 2888220781fc96d7bc0bf8a2b3f79579ecee7565 Mon Sep 17 00:00:00 2001
From: Marco van Hulten <Marco.van.Hulten@uni-bonn.de>
Date: Mon, 18 Aug 2025 17:31:41 +0200
Subject: [PATCH 4/4] Fixed the last commit

---
 build_tsmp2.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/build_tsmp2.sh b/build_tsmp2.sh
index 609c623..72eda45 100755
--- a/build_tsmp2.sh
+++ b/build_tsmp2.sh
@@ -292,7 +292,9 @@ else
 fi
 mkdir -p "${cmake_install_dir}"
 
-cmake_max_jobs="${max_jobs:-1}"
+if [ -v max_jobs ]; then
+  export CMAKE_BUILD_PARALLEL_LEVEL=${max_jobs}
+fi
 
 #
 # 5. CMake configure
@@ -322,7 +324,7 @@ message "== CMAKE GENERATE PROJECT finished"
 # 6. CMake build and install
 #
 message "CMAKE build:"
-message "cmake --build ${cmake_build_dir} --parallel ${cmake_max_jobs} |& tee -a $build_log"
+message "cmake --build ${cmake_build_dir} |& tee -a $build_log"
 message "== CMAKE BUILD start"
 cmake --build ${cmake_build_dir} |& tee -a $build_log
 message "== CMAKE BUILD finished"