bpo-38092: Reduce overhead when using multiprocessing in a Windows virtual environment (GH-16098)

zooba · miss-islington · commit f2b7556ef851 · 2019-09-13T09:40:19.000-07:00
https://bugs.python.org/issue38092
diff --git a/Lib/multiprocessing/popen_spawn_win32.py b/Lib/multiprocessing/popen_spawn_win32.py
@@ -72,7 +72,7 @@ def __init__(self, process_obj):
             try:
                 hp, ht, pid, tid = _winapi.CreateProcess(
                     python_exe, cmd,
-                    env, None, False, 0, None, None, None)
+                    None, None, False, 0, env, None, None)
                 _winapi.CloseHandle(ht)
             except:
                 _winapi.CloseHandle(rhandle)
diff --git a/Lib/multiprocessing/spawn.py b/Lib/multiprocessing/spawn.py
@@ -36,7 +36,7 @@
 if WINSERVICE:
     _python_exe = os.path.join(sys.exec_prefix, 'python.exe')
 else:
-    _python_exe = sys.executable
+    _python_exe = sys._base_executable
 
 def set_executable(exe):
     global _python_exe
diff --git a/Misc/NEWS.d/next/Windows/2019-09-13-14-11-42.bpo-38092.x31ehI.rst b/Misc/NEWS.d/next/Windows/2019-09-13-14-11-42.bpo-38092.x31ehI.rst
@@ -0,0 +1 @@
+Reduce overhead when using multiprocessing in a Windows virtual environment.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Reduce overhead when using multiprocessing in a Windows virtual environment.`