Use Get-WmiObject instead of wmic for counting cores on windows

CHANGES.md

@@ -1,5 +1,8 @@
 ### 3.5.0 - in development
 
+- Use powershell's ``Get-WmiObject`` instead of ``wmic`` for counting cores on
+  windows if ``wmic`` could not be found. ``wmic`` is deprecated and not available
+  on new builds of Windows. (#423)
 
 ### 3.4.1 - 2023-06-29
 

loky/backend/context.py

@@ -254,18 +254,32 @@
             cpu_info = {line for line in cpu_info if not line.startswith("#")}
             cpu_count_physical = len(cpu_info)
         elif sys.platform == "win32":
-            cpu_info = subprocess.run(
-                "wmic CPU Get NumberOfCores /Format:csv".split(),
-                capture_output=True,
-                text=True,
-            )
-            cpu_info = cpu_info.stdout.splitlines()
-            cpu_info = [
-                l.split(",")[1]
-                for l in cpu_info
-                if (l and l != "Node,NumberOfCores")
-            ]
-            cpu_count_physical = sum(map(int, cpu_info))
+            try:
+                # Wmic is not available on recent windows version
+                cpu_info = subprocess.run(
+                    "wmic CPU Get NumberOfCores /Format:csv".split(),
+                    capture_output=True,
+                    text=True,
+                )
+                cpu_info = cpu_info.stdout.splitlines()
+                cpu_info = [
+                    l.split(",")[1]
+                    for l in cpu_info
+                    if (l and l != "Node,NumberOfCores")
+                ]
+                cpu_count_physical = sum(map(int, cpu_info))
+            except FileNotFoundError:
+                cpu_info = subprocess.run(
+                    (
+                        "powershell Get-WmiObject "
+                        "-Class 'win32_processor' -Property 'numberOfCores' | "
+                        "Select-Object -ExpandProperty 'numberOfCores'"
+                    ).split(),
+                    capture_output=True,
+                    text=True,
+                )
+                cpu_info = cpu_info.stdout.splitlines()
+                cpu_count_physical = int(cpu_info[0])
         elif sys.platform == "darwin":
             cpu_info = subprocess.run(
                 "sysctl -n hw.physicalcpu".split(),