Add monkey.patch for gevent

cps.py

@@ -16,6 +16,11 @@
 #
 #  You should have received a copy of the GNU General Public License
 #  along with this program. If not, see <http://www.gnu.org/licenses/>.
+try:
+    from gevent import monkey
+    monkey.patch_all()
+except ImportError:
+    pass
 
 import sys
 import os