modified scheduler

circle/circle/settings/base.py

@@ -576,7 +576,7 @@ SESSION_COOKIE_NAME = "csessid%x" % (((getnode() // 139) ^
 MAX_NODE_RAM = get_env_variable("MAX_NODE_RAM", 1024)
 MAX_NODE_CPU_CORE = get_env_variable("MAX_NODE_CPU_CORE", 10)
 
-SCHEDULER_METHOD = get_env_variable("SCHEDULER_METHOD", 'random')
+SCHEDULER_METHOD = get_env_variable("SCHEDULER_METHOD", 'advanced')
 
 # Url to download the client: (e.g. http://circlecloud.org/client/download/)
 CLIENT_DOWNLOAD_URL = get_env_variable('CLIENT_DOWNLOAD_URL', 'http://circlecloud.org/client/download/')

circle/manager/scheduler.py

@@ -110,6 +110,7 @@ def select_node(instance, nodes):
     logger.info('select_node: %s for %s', unicode(result), unicode(instance))
 
     result.time_stamp = timezone.now()
+    result.save()
 
     return result
 
@@ -118,10 +119,11 @@ def sorting_key(node):
     """Determines how valuable a node is for scheduling.
     """
     key = 0
+    corr = last_scheduled_correction_factor(node)
     if free_cpu_time(node) < free_ram(node):
-        key = free_cpu_time(node)
+        key = free_cpu_time(node) * corr
     else:
-        key = free_ram(node)
+        key = free_ram(node) * corr
     return key
 
 def last_scheduled_correction_factor(node):
@@ -134,11 +136,13 @@ def last_scheduled_correction_factor(node):
     factor = 0
     max_time_diff = settings.SCHEDULER_TIME_SENSITIVITY_IN_SECONDS
     current_time = timezone.now()
-    factor = (current_time - node.time_stamp)/max_time_diff
+    time_difference_in_seconds = (current_time - node.time_stamp).total_seconds()
+    factor = time_difference_in_seconds/float(max_time_diff)
     if factor > 1:
         factor = 1
     elif factor < 0:
-        factor = 0    
+        factor = 1 
+    logger.info('Scheduler set factor to %s', unicode(factor))   
     return factor
 
 def has_traits(traits, node):