Release v1.6.1

.github/workflows/basic.yml

@@ -46,16 +46,16 @@ jobs:
         - name: Checkout lockfile
           run: git lfs checkout
 
-        - uses: prefix-dev/setup-pixi@v0.9.4
+        - uses: prefix-dev/setup-pixi@v0.10.0
           with:
-            pixi-version: v0.55.0
+            pixi-version: v0.69.0
             frozen: true
             environments: ${{ matrix.python-version }}
             activate-environment: ${{ matrix.python-version }}
 
-        - name: Install IBCDFO
+        - name: Install minq
           run: |
-            pixi run -e ${{ matrix.python-version }} ./install/install_ibcdfo.sh
+            pixi run -e ${{ matrix.python-version }} ./install/install_minq.sh
 
         - name: Install libEnsemble, test flake8
           run: |

.github/workflows/extra.yml

@@ -48,17 +48,16 @@ jobs:
         - name: Checkout lockfile
           run: git lfs checkout
 
-        - uses: prefix-dev/setup-pixi@v0.9.4
+        - uses: prefix-dev/setup-pixi@v0.10.0
           with:
-            pixi-version: v0.55.0
-            cache: true
+            pixi-version: v0.69.0
             frozen: true
             environments: ${{ matrix.python-version }}
             activate-environment: ${{ matrix.python-version }}
 
-        - name: Install other testing dependencies
+        - name: Install minq
           run: |
-            pixi run -e ${{ matrix.python-version }} install/install_ibcdfo.sh
+            pixi run -e ${{ matrix.python-version }} ./install/install_minq.sh
 
         - name: Install libEnsemble, flake8, lock environment
           run: |

.wci.yml

@@ -16,8 +16,8 @@ description: |
 language: Python
 
 release:
-  version: 1.6.0
-  date: 2026-03-04
+  version: 1.6.1
+  date: 2026-07-20
 
 documentation:
   general: https://libensemble.readthedocs.io

CHANGELOG.rst

@@ -8,6 +8,24 @@ GitHub issues are referenced, and can be viewed with hyperlinks on the `github r
 
 .. _`github releases page`: https://github.com/Libensemble/libensemble/releases
 
+Release 1.6.1
+--------------
+
+:Date: July 20, 2026
+
+Dependencies:
+
+* ``gest-api`` dependency upper-bound removed.
+
+:Note:
+
+* Tests were run on Linux and MacOS with Python versions 3.10, 3.11, 3.12, 3.13, 3.14
+
+:Known Issues:
+
+* See known issues section in the documentation.
+
+
 Release 1.6.0
 --------------
 
@@ -26,15 +44,15 @@ General Updates:
 Examples:
 
 * Adding test for ibcdfo with jax. #1591
-* Optimas/Xopt examples. #1620 / #1635 
+* Optimas/Xopt examples. #1620 / #1635
 * Bayesian Optimization with Xopt tutorial / notebook.
 * Tasmanian generators moved to community examples.
 
 Dependencies:
 
-* ``gest-api`` is now a required dependency. #1666 
+* ``gest-api`` is now a required dependency. #1666
 * Remove Pydantic v1 support and Balsam. #1573
-* Python 3.14 supported. #1609 
+* Python 3.14 supported. #1609
 
 
 :Note:

docs/advanced_installation.rst

@@ -12,7 +12,7 @@ automatically installed alongside libEnsemble:
 * `pydantic`_   ``>= 2``
 * pyyaml_       ``>= v6.0``
 * tomli_        ``>= 1.2.1``
-* gest-api_     ``>= 0.1,<0.2``
+* gest-api_     ``>= 0.1``
 
 We recommend installing in a virtual environment from ``uv``, ``conda`` or another source.
 

install/install_minq.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+git clone https://github.com/POptUS/MINQ
+pushd MINQ/py/minq5/
+export PYTHONPATH="$PYTHONPATH:$(pwd)"
+echo "PYTHONPATH=$PYTHONPATH" >> $GITHUB_ENV
+popd

libensemble/tests/regression_tests/common.py

@@ -5,6 +5,7 @@
 import glob
 import os
 import os.path
+import sys
 import time
 
 
@@ -72,6 +73,8 @@ def build_simfunc():
     # Build simfunc
     # buildstring='mpif90 -o my_simtask.x my_simtask.f90' # On cray need to use ftn
     buildstring = "mpicc -o my_simtask.x ../unit_tests/simdir/my_simtask.c"
+    if sys.platform == "darwin":
+        buildstring = "mpicc -cc=clang -o my_simtask.x ../unit_tests/simdir/my_simtask.c"
     # subprocess.run(buildstring.split(),check=True) #Python3.5+
     subprocess.check_call(buildstring.split())
 

libensemble/tests/run_tests.py

@@ -35,16 +35,16 @@
 # Test Directories - all relative to project root dir
 CODE_DIR = "libensemble"
 LIBE_SRC_DIR = CODE_DIR
-TESTING_DIR = os.path.join(CODE_DIR, "tests")
+TESTING_DIR = Path(CODE_DIR) / "tests"
 UNIT_TEST_SUBDIRS = [
     "unit_tests",
     "unit_tests_mpi_import",
     "unit_tests_nompi",
     "unit_tests_logger",
 ]
-UNIT_TEST_DIRS = [os.path.join(TESTING_DIR, subdir) for subdir in UNIT_TEST_SUBDIRS]
-REG_TEST_SUBDIR = os.path.join(TESTING_DIR, "regression_tests")
-FUNC_TEST_SUBDIR = os.path.join(TESTING_DIR, "functionality_tests")
+UNIT_TEST_DIRS = [TESTING_DIR / subdir for subdir in UNIT_TEST_SUBDIRS]
+REG_TEST_SUBDIR = TESTING_DIR / "regression_tests"
+FUNC_TEST_SUBDIR = TESTING_DIR / "functionality_tests"
 
 # Coverage merge and report dir
 COV_MERGE_DIR = TESTING_DIR
@@ -129,15 +129,25 @@ def cleanup(root_dir):
         "opt_*.txt_flag",
         "test_executor_forces_tutorial",
         "test_executor_forces_tutorial_2",
+        # Coverage output generated by merge_coverage_reports
+        "coverage.xml",
+        # Cache files created by Ensemble/calling scripts
+        ".libe_cache_*.meta.json",
+        # Artifacts from forces build step
+        "forces_app",
+        "scaling_tests/forces/forces_app/forces.x",
+        # Task output scripts in unit tests
+        "libe_task_*.sh",
     ]
     dirs_to_clean = UNIT_TEST_DIRS + [REG_TEST_SUBDIR, FUNC_TEST_SUBDIR]
     for dir_path in dirs_to_clean:
-        full_path = os.path.join(root_dir, dir_path)
-        if "libensemble/tests/" not in full_path.replace("\\", "/"):
-            cprint(f"Safety check failed for {full_path}. Check directory", style="red")
+        full_path = Path(root_dir) / dir_path
+        full_path_str = str(full_path)
+        if "libensemble/tests/" not in full_path_str.replace("\\", "/"):
+            cprint(f"Safety check failed for {full_path_str}. Check directory", style="red")
             sys.exit(2)
         for pattern in patterns:
-            for file_path in glob.glob(os.path.join(full_path, pattern)):
+            for file_path in glob.glob(str(full_path / pattern)):
                 try:
                     if os.path.isfile(file_path) or os.path.islink(file_path):
                         os.remove(file_path)
@@ -199,8 +209,8 @@ def print_test_failed(test_num, test_script_name, comm, nprocs, duration):
 def merge_coverage_reports(root_dir):
     """Merge coverage data from multiple tests and generate a report."""
     print_heading("Generating coverage reports")
-    tests_dir = os.path.join(root_dir, "libensemble", "tests")
-    cov_files = glob.glob(os.path.join(tests_dir, "**", ".cov_*"), recursive=True)
+    tests_dir = Path(root_dir) / "libensemble" / "tests"
+    cov_files = glob.glob(str(tests_dir / "**" / ".cov_*"), recursive=True)
 
     if cov_files:
         try:
@@ -262,11 +272,14 @@ def is_open_mpi():
 def build_forces(root_dir):
     """Build forces.x using mpicc."""
     cprint("Building forces.x before running regression tests...", style="yellow", newline=True)
-    forces_app_dir = os.path.join(root_dir, "libensemble/tests/scaling_tests/forces/forces_app")
-    subprocess.run(["mpicc", "-O3", "-o", "forces.x", "forces.c", "-lm"], cwd=forces_app_dir, check=True)
-    destination_dir = os.path.join(root_dir, "libensemble/tests/forces_app")
+    forces_app_dir = Path(root_dir) / "libensemble/tests/scaling_tests/forces/forces_app"
+    build_cmd = ["mpicc", "-O3", "-o", "forces.x", "forces.c", "-lm"]
+    if platform.system() == "Darwin":
+        build_cmd = ["mpicc", "-cc=clang", "-O3", "-o", "forces.x", "forces.c", "-lm"]
+    subprocess.run(build_cmd, cwd=forces_app_dir, check=True)
+    destination_dir = Path(root_dir) / "libensemble/tests/forces_app"
     os.makedirs(destination_dir, exist_ok=True)
-    shutil.copy(os.path.join(forces_app_dir, "forces.x"), destination_dir)
+    shutil.copy(forces_app_dir / "forces.x", destination_dir)
 
 
 def skip_test(directives, args, current_os):
@@ -335,7 +348,7 @@ def run_unit_tests(root_dir, python_exec, args):
     print_heading(f"Running unit tests (with pytest)")
     for dir_path in UNIT_TEST_DIRS:
         cprint(f"Entering unit test dir: {dir_path}", style="yellow", newline=True)
-        full_path = os.path.join(root_dir, dir_path)
+        full_path = Path(root_dir) / dir_path
         cov_rep = cov_report_type + ":cov_unit"
         cmd = python_exec + ["-m", "pytest", "--color=yes", "--timeout=120", "--cov", "--cov-report", cov_rep]
         if args.e:
@@ -366,8 +379,8 @@ def run_regression_tests(root_dir, python_exec, args, current_os):
     reg_test_list = REG_TEST_LIST
     reg_test_files = []
     for dir_path in test_dirs:
-        full_path = os.path.join(root_dir, dir_path)
-        reg_test_files.extend(glob.glob(os.path.join(full_path, reg_test_list)))
+        full_path = Path(root_dir) / dir_path
+        reg_test_files.extend(glob.glob(str(full_path / reg_test_list)))
 
     reg_test_files = sorted(reg_test_files)
     reg_pass = 0

libensemble/tests/unit_tests/test_executor.py

@@ -84,6 +84,10 @@ def build_simfuncs():
         app_name = ".".join([sim.split(".")[0], "x"])
         if not os.path.isfile(app_name):
             buildstring = "mpicc -o " + os.path.join("simdir", app_name) + " " + os.path.join("simdir", sim)
+            if sys.platform == "darwin":
+                buildstring = (
+                    "mpicc -cc=clang -o " + os.path.join("simdir", app_name) + " " + os.path.join("simdir", sim)
+                )
             subprocess.check_call(buildstring.split())
 
 

libensemble/tests/unit_tests/test_executor_gpus.py

@@ -48,6 +48,10 @@ def build_simfuncs():
         app_name = ".".join([sim.split(".")[0], "x"])
         if not os.path.isfile(app_name):
             buildstring = "mpicc -o " + os.path.join("simdir", app_name) + " " + os.path.join("simdir", sim)
+            if sys.platform == "darwin":
+                buildstring = (
+                    "mpicc -cc=clang -o " + os.path.join("simdir", app_name) + " " + os.path.join("simdir", sim)
+                )
             subprocess.check_call(buildstring.split())
 
 

libensemble/version.py

@@ -1 +1 @@
-__version__ = "1.6.0"
+__version__ = "1.6.1"

pyproject.toml

@@ -105,6 +105,9 @@ scipy = ">=1.15.2,<2"
 mpmath = "<=1.3.0"
 nlopt = ">=2.10.0,<3"
 
+[tool.pixi.feature.basic.pypi-dependencies]
+ibcdfo = { git = "https://github.com/POptUS/IBCDFO.git", subdirectory = "ibcdfo_pypkg" }
+
 # "dev" dependencies needed for basic CI
 flake8 = ">=7.3.0,<8"
 coverage = ">=7.13.0,<8"
@@ -204,7 +207,7 @@ tomli = ">=2.2.1,<3"
 
 # macOS dependencies
 [tool.pixi.target.osx-arm64.dependencies]
-clang_osx-arm64 = ">=21.1.7,<22"
+clang_osx-arm64 = ">=22.1.0,<23"
 
 # Linux dependencies
 [tool.pixi.target.linux-64.dependencies]