Add a sleep in the NmapProcess.__wait. This has the down side of reducing the resolutionof our polling for output from or completion of the command, but has the benefit of greatly reducing CPU utilization in libnmap. Before this change we would sit at 100% CPU in libnmap while a long running scan was in progress.

warnerpr-cyan · warnerpr-cyan · commit 76c2c986f1dc · 2014-04-07T12:59:11.000-07:00
diff --git a/libnmap/process.py b/libnmap/process.py
@@ -7,6 +7,7 @@
 from threading import Thread
 from xml.dom import pulldom
 import warnings
+import time
 try:
     from Queue import Queue, Empty, Full
 except ImportError:
@@ -271,6 +272,7 @@ def __wait(self):
                     self.__nmap_event_callback(self)
                 self.__stdout += thread_stream
                 self.__io_queue.task_done()
+            time.sleep(0.01)
 
         self.__nmap_rc = self.__nmap_proc.poll()
         if self.rc is None:
