Add Theano flag cmodule.preload_cache

doc/library/config.txt

@@ -699,3 +699,9 @@ import theano and print the config variable, as in:
     Bool value, default: False
 
     If True, will print compilation warnings.
+
+.. attribute:: cmodule.preload_cache'
+
+    Bool value, default: False
+
+    If set to True, will preload the C module cache at import time

theano/gof/__init__.py

@@ -81,3 +81,6 @@ from theano.gof.type import \
 
 from theano.gof.utils import \
     hashtype, object2, MethodNotDefined
+
+if theano.config.cmodule.preload_cache:
+    cc.get_module_cache()

theano/gof/cmodule.py

@@ -62,6 +62,11 @@ AddConfigVar('cmodule.compilation_warning',
              BoolParam(False))
 
 
+AddConfigVar('cmodule.preload_cache',
+             "If set to True, will preload the C module cache at import time",
+             BoolParam(False, allow_override=False),
+             in_c_key=False)
+
 _logger = logging.getLogger("theano.gof.cmodule")
 _logger.setLevel(logging.WARNING)