--- old/src/hotspot/os/windows/os_windows.cpp	2017-10-11 14:34:46.921171243 -0400
+++ new/src/hotspot/os/windows/os_windows.cpp	2017-10-11 14:34:45.705101956 -0400
@@ -720,6 +720,14 @@
 }
 
 int os::active_processor_count() {
+  // User has overridden the number of active processors
+  if (ActiveProcessorCount > 0) {
+    log_trace(os)("active_processor_count: "
+                  "active processor count set by user : %d",
+                  (int)ActiveProcessorCount);
+    return ActiveProcessorCount;
+  }
+
   DWORD_PTR lpProcessAffinityMask = 0;
   DWORD_PTR lpSystemAffinityMask = 0;
   int proc_count = processor_count();