x/terracotta
Code Issues Proposed changes

Added a new VM selection algorithm: minimum_migration_time_max_cpu

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This commit is contained in:
Anton Beloglazov 2012-10-30 10:50:48 +11:00
parent 3b48d3e451
commit 4bfec46215
2 changed files with 144 additions and 0 deletions
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52
neat/locals/vm_selection/algorithms.py
View File

@ -84,6 +84,28 @@ def minimum_migration_time_factory(time_step, migration_time, params):
([minimum_migration_time(vms_ram)], {})
@contract
def minimum_migration_time_max_cpu_factory(time_step, migration_time, params):
""" Creates the minimum migration time / max CPU usage VM selection algorithm.
:param time_step: The length of the simulation time step in seconds.
:type time_step: int,>=0
:param migration_time: The VM migration time in time seconds.
:type migration_time: float,>=0
:param params: A dictionary containing the algorithm's parameters.
:type params: dict(str: *)
:return: A function implementing the minimum migration time / max CPU VM selection.
:rtype: function
"""
return lambda vms_cpu, vms_ram, state=None: \
([minimum_migration_time_max_cpu(params['last_n'],
vms_cpu,
vms_ram)], {})
@contract
def minimum_migration_time(vms_ram):
""" Selects the VM with the minimum RAM usage.
@ -126,3 +148,33 @@ def random(vms_cpu):
:rtype: str
"""
return choice(vms_cpu.keys())
@contract
def minimum_migration_time_max_cpu(last_n, vms_cpu, vms_ram):
""" Selects the VM with the minimum RAM and maximum CPU usage.
:param last_n: The number of last CPU utilization values to average.
:type last_n: int,>0
:param vms_cpu: A map of VM UUID and their CPU utilization histories.
:type vms_cpu: dict(str: list)
:param vms_ram: A map of VM UUID and their RAM usage data.
:type vms_ram: dict(str: number)
:return: A VM to migrate from the host.
:rtype: str
"""
min_ram = min(vms_ram.values())
max_cpu = 0
selected_vm = None
for vm, cpu in vms_cpu.items():
if vms_ram[vm] > min_ram:
continue
vals = cpu[-last_n:]
avg = sum(vals) / len(vals)
if max_cpu < avg:
max_cpu = avg
selected_vm = vm
return selected_vm

92
tests/locals/vm_selection/test_algorithms.py
View File

@ -69,6 +69,53 @@ class Selection(TestCase):
expect(selection).choice(x.keys()).and_return(vm).once()
assert alg(x, dict()) == ([vm], {})
@qc(10)
def minimum_migration_time_max_cpu_factory(
x=dict_(
keys=str_(of='abc123-', min_length=36, max_length=36),
values=tuple_(list_(of=int_(min=0, max=3000),
min_length=1, max_length=10),
int_(min=0, max=3000)),
min_length=1, max_length=5
),
last_n=int_(min=1, max=10)
):
alg = selection.minimum_migration_time_max_cpu_factory(
300, 20., {'last_n': last_n})
vms_cpu = dict((k, v[0]) for k, v in x.items())
vms_ram = dict((k, v[1]) for k, v in x.items())
min_ram = min(vms_ram.values())
min_ram_vms_cpu = dict((k, sum(v[-last_n:]) / len(v[-last_n:]))
for k, v in vms_cpu.items()
if vms_ram[k] == min_ram and len(v[-last_n:]) > 0)
values = min_ram_vms_cpu.values()
vm_index = values.index(max(values))
vm = min_ram_vms_cpu.keys()[vm_index]
assert alg(vms_cpu, vms_ram) == ([vm], {})
@qc(10)
def minimum_migration_time_max_cpu_factory_equal_ram(
vms_cpu=dict_(
keys=str_(of='abc123-', min_length=36, max_length=36),
values=list_(of=int_(min=0, max=3000),
min_length=1, max_length=10),
min_length=1, max_length=5
),
ram=int_(min=1000, max=3000),
last_n=int_(min=1, max=10)
):
alg = selection.minimum_migration_time_max_cpu_factory(
300, 20., {'last_n': last_n})
vms_ram = dict((k, ram) for k, _ in vms_cpu.items())
min_ram = min(vms_ram.values())
min_ram_vms_cpu = dict((k, sum(v[-last_n:]) / len(v[-last_n:]))
for k, v in vms_cpu.items()
if vms_ram[k] == min_ram and len(v[-last_n:]) > 0)
values = min_ram_vms_cpu.values()
vm_index = values.index(max(values))
vm = min_ram_vms_cpu.keys()[vm_index]
assert alg(vms_cpu, vms_ram) == ([vm], {})
@qc(10)
def minimum_migration_time(
x=dict_(
@ -111,3 +158,48 @@ class Selection(TestCase):
vm = x.keys()[random.randrange(len(x))]
expect(selection).choice(x.keys()).and_return(vm).once()
assert selection.random(x) == vm
@qc
def minimum_migration_time_max_cpu(
x=dict_(
keys=str_(of='abc123-', min_length=36, max_length=36),
values=tuple_(list_(of=int_(min=0, max=3000),
min_length=1, max_length=10),
int_(min=0, max=3000)),
min_length=1, max_length=5
),
last_n=int_(min=1, max=10)
):
vms_cpu = dict((k, v[0]) for k, v in x.items())
vms_ram = dict((k, v[1]) for k, v in x.items())
min_ram = min(vms_ram.values())
min_ram_vms_cpu = dict((k, sum(v[-last_n:]) / len(v[-last_n:]))
for k, v in vms_cpu.items()
if vms_ram[k] == min_ram and len(v[-last_n:]) > 0)
values = min_ram_vms_cpu.values()
vm_index = values.index(max(values))
vm = min_ram_vms_cpu.keys()[vm_index]
assert selection.minimum_migration_time_max_cpu(
last_n, vms_cpu, vms_ram) == vm
@qc(1)
def minimum_migration_time_max_cpu_equal_ram(
vms_cpu=dict_(
keys=str_(of='abc123-', min_length=36, max_length=36),
values=list_(of=int_(min=0, max=3000),
min_length=1, max_length=10),
min_length=1, max_length=5
),
ram=int_(min=1000, max=3000),
last_n=int_(min=1, max=10)
):
vms_ram = dict((k, ram) for k, _ in vms_cpu.items())
min_ram = min(vms_ram.values())
min_ram_vms_cpu = dict((k, sum(v[-last_n:]) / len(v[-last_n:]))
for k, v in vms_cpu.items()
if vms_ram[k] == min_ram and len(v[-last_n:]) > 0)
values = min_ram_vms_cpu.values()
vm_index = values.index(max(values))
vm = min_ram_vms_cpu.keys()[vm_index]
assert selection.minimum_migration_time_max_cpu(
last_n, vms_cpu, vms_ram) == vm