Moved calculate_migration_time from the local manager to common

neat/common.py

@@ -21,6 +21,7 @@ from neat.contracts_extra import *
 import os
 import time
 import json
+import numpy
 
 from neat.config import *
 from neat.db_utils import *
@@ -222,3 +223,18 @@ def parse_parameters(params):
     return dict((str(k), v) 
                 for k, v in json.loads(params).items())
 
+    
+@contract
+def calculate_migration_time(vms, bandwidth):
+    """ Calculate the mean migration time from VM RAM usage data.
+
+    :param vms: A map of VM UUIDs to the corresponding maximum RAM in MB.
+     :type vms: dict(str: int)
+
+    :param bandwidth: The network bandwidth in MB/s.
+     :type bandwidth: float,>0
+
+    :return: The mean VM migration time in seconds.
+     :rtype: float
+    """
+    return float(numpy.mean(vms.values()) / bandwidth)

neat/globals/manager.py

@@ -267,8 +267,8 @@ def execute_underload(config, state, host):
     :param state: A state dictionary.
      :type state: dict(str: *)
 
-    :param state: A host name.
+    :param host: A host name.
-     :type state: str
+     :type host: str
 
     :return: The updated state dictionary.
      :rtype: dict(str: *)
@@ -284,8 +284,8 @@ def execute_underload(config, state, host):
     for host, vms in hosts_to_vms.items():
         host_cpu_mhz = sum(vms_last_cpu[x] for x in vms)
         if host_cpu_mhz > 0:
-            host_cpu_usage[host] = host_cpu_mhz
+            hosts_cpu_usage[host] = host_cpu_mhz
-            host_ram_usage[host] = host_used_ram(state['nova'], host)
+            hosts_ram_usage[host] = host_used_ram(state['nova'], host)
         else:
             # Exclude inactive hosts
             del hosts_cpu_total[host]
@@ -302,8 +302,8 @@ def execute_underload(config, state, host):
     vms_ram = vms_ram_limit(state['nova'], vms_to_migrate)
 
     time_step = int(config.get('data_collector_interval'))
-    migration_time = calculate_migration_time(
+    migration_time = common.calculate_migration_time(
-        vm_ram,
+        vms_ram,
         float(config.get('network_migration_bandwidth')))
 
     if 'vm_placement' not in state:
@@ -397,7 +397,7 @@ def vms_by_host(nova, host):
     :return: A list of VM UUIDs from the specified host.
      :rtype: list(str)
     """
-    return [vm.id for vm in nova.servers.list()
+    return [str(vm.id) for vm in nova.servers.list()
             if vm_hostname(vm) == host]
 
 
@@ -470,8 +470,8 @@ def execute_overload(config, state, vm_uuids):
     for host, vms in hosts_to_vms.items():
         host_cpu_mhz = sum(vms_last_cpu[x] for x in vms)
         if host_cpu_mhz > 0:
-            host_cpu_usage[host] = host_cpu_mhz
+            hosts_cpu_usage[host] = host_cpu_mhz
-            host_ram_usage[host] = host_used_ram(state['nova'], host)
+            hosts_ram_usage[host] = host_used_ram(state['nova'], host)
         else:
             inactive_hosts_cpu[host] = hosts_cpu_total[host]
             inactive_hosts_ram[host] = hosts_ram_total[host]
@@ -483,8 +483,8 @@ def execute_overload(config, state, vm_uuids):
     vms_ram = vms_ram_limit(state['nova'], vms_to_migrate)
 
     time_step = int(config.get('data_collector_interval'))
-    migration_time = calculate_migration_time(
+    migration_time = common.calculate_migration_time(
-        vm_ram,
+        vms_ram,
         float(config.get('network_migration_bandwidth')))
 
     if 'vm_placement' not in state:
@@ -503,7 +503,7 @@ def execute_overload(config, state, vm_uuids):
     placement, vm_placement_state = vm_placement(
         hosts_cpu_usage, hosts_cpu_total,
         hosts_ram_usage, hosts_ram_total,
-        host_cpu_usage, host_ram_usage,
+        inactive_hosts_cpu, inactive_hosts_ram,
         vms_cpu, vms_ram,
         vm_placement_state)
     state['vm_placement_state'] = vm_placement_state

neat/locals/manager.py

@@ -103,7 +103,6 @@ local manager performs the following steps:
 from contracts import contract
 from neat.contracts_extra import *
 
-import numpy
 import itertools
 
 import neat.common as common
@@ -214,7 +213,7 @@ def execute(config, state):
     host_cpu_utilization = vm_mhz_to_percentage(
         vm_cpu_mhz, physical_cpu_mhz_total)
     time_step = int(config['data_collector_interval'])
-    migration_time = calculate_migration_time(
+    migration_time = common.calculate_migration_time(
         vm_ram, float(config['network_migration_bandwidth']))
 
     if 'underload_detection' not in state:
@@ -373,19 +372,3 @@ def vm_mhz_to_percentage(vms, physical_cpu_mhz):
     """
     data = itertools.izip_longest(*vms.values(), fillvalue=0)
     return [float(sum(x)) / physical_cpu_mhz for x in data]
-
-
-@contract
-def calculate_migration_time(vms, bandwidth):
-    """ Calculate the mean migration time from VM RAM usage data.
-
-    :param vms: A map of VM UUIDs to the corresponding maximum RAM in MB.
-     :type vms: dict(str: int)
-
-    :param bandwidth: The network bandwidth in MB/s.
-     :type bandwidth: float,>0
-
-    :return: The mean VM migration time in seconds.
-     :rtype: float
-    """
-    return float(numpy.mean(vms.values()) / bandwidth)

tests/locals/test_manager.py

@@ -155,17 +155,3 @@ class LocalManager(TestCase):
              'c': [100, 100, 700]},
             3000),
             [0.1, 0.2, 0.4])
-
-    @qc(10)
-    def calculate_migration_time(
-        data=dict_(
-            keys=str_(of='abc123-', min_length=36, max_length=36),
-            values=int_(min=1, max=1000),
-            min_length=1, max_length=10
-        ),
-        bandwidth=float_(min=1., max=100.)
-    ):
-        ram = data.values()
-        migration_time = float(sum(ram)) / len(ram) / bandwidth
-        assert manager.calculate_migration_time(data, bandwidth) == \
-            migration_time

tests/test_common.py

@@ -145,3 +145,17 @@ class Common(TestCase):
         params = '{"param1": 0.56, "param2": "abc"}'
         self.assertEqual(common.parse_parameters(params), {'param1': 0.56,
                                                            'param2': 'abc'})
+
+    @qc(10)
+    def calculate_migration_time(
+        data=dict_(
+            keys=str_(of='abc123-', min_length=36, max_length=36),
+            values=int_(min=1, max=1000),
+            min_length=1, max_length=10
+        ),
+        bandwidth=float_(min=1., max=100.)
+    ):
+        ram = data.values()
+        migration_time = float(sum(ram)) / len(ram) / bandwidth
+        assert common.calculate_migration_time(data, bandwidth) == \
+            migration_time