diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index 87b184546..fddc7548e 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -106,46 +106,14 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf macos-clang-sanitizer-install.tar.gz -C install
-      - name: Run func tests (MPI, num_proc=1)
-        run: python3 scripts/run_tests.py --running-type="processes"
+      - name: Run func tests (MPI)
+        run: python3 scripts/run_tests.py --running-type="processes" --counts 1 2 3 4
         env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run func tests (MPI, num_proc=2)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 2
-          PPC_NUM_THREADS: 2
-      - name: Run func tests (MPI, num_proc=3)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 3
-          PPC_NUM_THREADS: 1
-      - name: Run func tests (MPI, num_proc=4)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 4
           PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
   macos-clang-test-extended:
     needs:
       - macos-clang-test
@@ -168,23 +136,7 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf macos-clang-sanitizer-install.tar.gz -C install
-      - name: Run tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-      - name: Run tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-      - name: Run tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-      - name: Run tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 7904b1b3b..b150df11f 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -120,46 +120,14 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf ubuntu-gcc-install-${{ matrix.os }}.tar.gz -C install
-      - name: Run func tests (MPI, num_proc=1)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run func tests (MPI, num_proc=2)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 2
-          PPC_NUM_THREADS: 2
-      - name: Run func tests (MPI, num_proc=3)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 3
-          PPC_NUM_THREADS: 1
-      - name: Run func tests (MPI, num_proc=4)
-        run: python3 scripts/run_tests.py --running-type="processes"
+      - name: Run func tests (MPI)
+        run: python3 scripts/run_tests.py --running-type="processes" --counts 1 2 3 4
         env:
-          PPC_NUM_PROC: 4
           PPC_NUM_THREADS: 1
-      - name: Run func tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run func tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-      - name: Run func tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run func tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run func tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
   ubuntu-gcc-test-extended:
     needs:
       - ubuntu-gcc-test
@@ -182,26 +150,10 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf ubuntu-gcc-install-${{ matrix.os }}.tar.gz -C install
-      - name: Run func tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run func tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-      - name: Run func tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-      - name: Run func tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-      - name: Run func tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
   ubuntu-clang-build:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -273,46 +225,14 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf ubuntu-clang-install-${{ matrix.os }}.tar.gz -C install
-      - name: Run func tests (MPI, num_proc=1)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run func tests (MPI, num_proc=2)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 2
-          PPC_NUM_THREADS: 2
-      - name: Run func tests (MPI, num_proc=3)
-        run: python3 scripts/run_tests.py --running-type="processes"
+      - name: Run func tests (MPI)
+        run: python3 scripts/run_tests.py --running-type="processes" --counts 1 2 3 4
         env:
-          PPC_NUM_PROC: 3
           PPC_NUM_THREADS: 1
-      - name: Run func tests (MPI, num_proc=4)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 4
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
   ubuntu-clang-test-extended:
     needs:
       - ubuntu-clang-test
@@ -337,26 +257,10 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf ubuntu-clang-install-${{ matrix.os }}.tar.gz -C install
-      - name: Run tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-      - name: Run tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-      - name: Run tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-      - name: Run tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
   ubuntu-clang-sanitizer-build:
     needs:
       - ubuntu-clang-build
@@ -435,42 +339,16 @@ jobs:
           mkdir -p install
           tar -xzvf ubuntu-clang-sanitizer-install-${{ matrix.os }}.tar.gz -C install
       - name: Run tests (MPI)
-        run: python3 scripts/run_tests.py --running-type="processes" --additional-mpi-args="--oversubscribe"
+        run: python3 scripts/run_tests.py --running-type="processes" --counts 2 --additional-mpi-args="--oversubscribe"
         env:
-          PPC_NUM_PROC: 2
           PPC_NUM_THREADS: 2
           PPC_ASAN_RUN: 1
           ASAN_OPTIONS: abort_on_error=1
           UBSAN_OPTIONS: halt_on_error=1
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-          PPC_ASAN_RUN: 1
-          ASAN_OPTIONS: abort_on_error=1
-          UBSAN_OPTIONS: halt_on_error=1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-          PPC_ASAN_RUN: 1
-          ASAN_OPTIONS: abort_on_error=1
-          UBSAN_OPTIONS: halt_on_error=1
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-          PPC_ASAN_RUN: 1
-          ASAN_OPTIONS: abort_on_error=1
-          UBSAN_OPTIONS: halt_on_error=1
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
           PPC_ASAN_RUN: 1
           ASAN_OPTIONS: abort_on_error=1
           UBSAN_OPTIONS: halt_on_error=1
@@ -499,29 +377,10 @@ jobs:
         run: |
           mkdir -p install
           tar -xzvf ubuntu-clang-sanitizer-install-${{ matrix.os }}.tar.gz -C install
-      - name: Run tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-          PPC_ASAN_RUN: 1
-      - name: Run tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-          PPC_ASAN_RUN: 1
-      - name: Run tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-          PPC_ASAN_RUN: 1
-      - name: Run tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
           PPC_ASAN_RUN: 1
   ubuntu-gcc-build-codecov:
     needs:
@@ -557,26 +416,10 @@ jobs:
         env:
           PPC_NUM_PROC: 2
           PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
       - name: Generate gcovr Coverage Data
         run: |
           mkdir cov-report
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 2dceaec12..8933178f3 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -118,46 +118,14 @@ jobs:
       - name: Extract installed package
         run: Expand-Archive -Path .\windows-msvc-install.zip -DestinationPath . -Force
         shell: pwsh
-      - name: Run func tests (MPI, num_proc=1)
-        run: python3 scripts/run_tests.py --running-type="processes"
+      - name: Run func tests (MPI)
+        run: python3 scripts/run_tests.py --running-type="processes" --counts 1 2 3 4
         env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run func tests (MPI, num_proc=2)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 2
-          PPC_NUM_THREADS: 2
-      - name: Run func tests (MPI, num_proc=3)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 3
-          PPC_NUM_THREADS: 1
-      - name: Run func tests (MPI, num_proc=4)
-        run: python3 scripts/run_tests.py --running-type="processes"
-        env:
-          PPC_NUM_PROC: 4
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
           PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
   windows-msvc-test-extended:
     needs:
       - windows-msvc-test
@@ -182,26 +150,10 @@ jobs:
       - name: Extract installed package
         run: Expand-Archive -Path .\windows-msvc-install.zip -DestinationPath . -Force
         shell: pwsh
-      - name: Run tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-      - name: Run tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-      - name: Run tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-      - name: Run tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
   windows-clang-build:
     runs-on: windows-latest
     defaults:
@@ -280,26 +232,10 @@ jobs:
       - name: Extract installed package
         run: Expand-Archive -Path .\windows-clang-install.zip -DestinationPath . -Force
         shell: pwsh
-      - name: Run tests (threads, num_threads=1)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 1
-      - name: Run tests (threads, num_threads=2)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 2
-      - name: Run tests (threads, num_threads=3)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 1 2 3 4
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 3
-      - name: Run tests (threads, num_threads=4)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 4
   windows-clang-test-extended:
     needs:
       - windows-clang-test
@@ -324,23 +260,7 @@ jobs:
       - name: Extract installed package
         run: Expand-Archive -Path .\windows-clang-install.zip -DestinationPath . -Force
         shell: pwsh
-      - name: Run tests (threads, num_threads=5)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 5
-      - name: Run tests (threads, num_threads=7)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 7
-      - name: Run tests (threads, num_threads=11)
-        run: python3 scripts/run_tests.py --running-type="threads"
-        env:
-          PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 11
-      - name: Run tests (threads, num_threads=13)
-        run: python3 scripts/run_tests.py --running-type="threads"
+      - name: Run tests (threads extended)
+        run: python3 scripts/run_tests.py --running-type="threads" --counts 5 7 11 13
         env:
           PPC_NUM_PROC: 1
-          PPC_NUM_THREADS: 13
diff --git a/scripts/run_tests.py b/scripts/run_tests.py
index 4e40494dc..9d97795b3 100644
--- a/scripts/run_tests.py
+++ b/scripts/run_tests.py
@@ -20,6 +20,12 @@ def init_cmd_args():
         default="",
         help="Additional MPI arguments to pass to the mpirun command (optional)."
     )
+    parser.add_argument(
+        "--counts",
+        nargs="+",
+        type=int,
+        help="List of process/thread counts to run sequentially"
+    )
     args = parser.parse_args()
     _args_dict = vars(args)
     return _args_dict
@@ -135,19 +141,39 @@ def run_performance(self):
             )
 
 
-if __name__ == "__main__":
-    args_dict = init_cmd_args()
-    ppc_runner = PPCRunner()
-    ppc_runner.setup_env(os.environ.copy())
+def _execute(args_dict, env):
+    runner = PPCRunner()
+    runner.setup_env(env)
 
     if args_dict["running_type"] in ["threads", "processes"]:
-        ppc_runner.run_core()
+        runner.run_core()
 
     if args_dict["running_type"] == "threads":
-        ppc_runner.run_threads()
+        runner.run_threads()
     elif args_dict["running_type"] == "processes":
-        ppc_runner.run_processes(args_dict["additional_mpi_args"])
+        runner.run_processes(args_dict["additional_mpi_args"])
     elif args_dict["running_type"] == "performance":
-        ppc_runner.run_performance()
+        runner.run_performance()
     else:
         raise Exception("running-type is wrong!")
+
+
+if __name__ == "__main__":
+    args_dict = init_cmd_args()
+    counts = args_dict.get("counts")
+
+    if counts:
+        for count in counts:
+            env_copy = os.environ.copy()
+
+            if args_dict["running_type"] == "threads":
+                env_copy["PPC_NUM_THREADS"] = str(count)
+                env_copy.setdefault("PPC_NUM_PROC", "1")
+            elif args_dict["running_type"] == "processes":
+                env_copy["PPC_NUM_PROC"] = str(count)
+                env_copy.setdefault("PPC_NUM_THREADS", "1")
+
+            print(f"Executing with {args_dict['running_type']} count: {count}")
+            _execute(args_dict, env_copy)
+    else:
+        _execute(args_dict, os.environ.copy())