*** old/src/hotspot/os/aix/os_aix.cpp	Wed Oct 11 14:34:29 2017
--- new/src/hotspot/os/aix/os_aix.cpp	Wed Oct 11 14:34:28 2017

*** 3622,3631 ****
--- 3622,3639 ----
      fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
    }
  };
  
  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;
+   }
+ 
    int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
    assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
    return online_cpus;
  }