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Commit
1450d8ee
authored
Nov 22, 2013
by
Dudás Ádám
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manager: basic scheduler w/ mock monitor data
parent
4ddd2e68
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64 additions
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7 deletions
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circle/manager/scheduler.py
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circle/manager/scheduler.py
View file @
1450d8ee
from
django.db.models
import
Sum
class
NotEnoughMemoryException
(
Exception
):
def
__init__
(
self
,
message
=
None
):
if
message
is
None
:
message
=
"No node has enough memory to accomodate the guest."
Exception
.
__init__
(
self
,
message
)
class
TraitsUnsatisfiableException
(
Exception
):
def
__init__
(
self
,
message
=
None
):
if
message
is
None
:
message
=
"No node can satisfy all required traits of the guest."
Exception
.
__init__
(
self
,
message
)
def
get_node
(
instance
,
nodes
):
''' Select a node for hosting an instance based on its requirements.
'''
# Return first Node or None
try
:
req_traits
=
set
(
instance
.
req_traits
.
all
())
nodes
=
[
n
for
n
in
nodes
if
req_traits
.
issubset
(
n
.
traits
.
all
())]
return
nodes
[
0
]
except
:
return
None
# check required traits
nodes
=
[
n
for
n
in
nodes
if
has_traits
(
instance
.
req_traits
.
all
(),
n
)]
if
not
nodes
:
raise
TraitsUnsatisfiableException
()
# check required RAM
nodes
=
[
n
for
n
in
nodes
if
has_enough_ram
(
instance
.
ram_size
,
n
)]
if
not
nodes
:
raise
NotEnoughMemoryException
()
# sort nodes first by processor usage, then priority
nodes
.
sort
(
key
=
lambda
n
:
n
.
priority
,
reverse
=
True
)
nodes
.
sort
(
key
=
processor_usage
)
return
nodes
[
0
]
def
has_traits
(
traits
,
node
):
"""True, if the node has all specified traits; otherwise, false.
"""
traits
=
set
(
traits
)
return
traits
.
issubset
(
node
.
traits
.
all
())
def
has_enough_ram
(
ram_size
,
node
):
"""True, if the node has enough memory to accomodate a guest requiring
ram_size mebibytes of memory; otherwise, false.
"""
total
=
node
.
ram_size
used
=
512
# TODO replace mock value with data from monitor
unused
=
total
-
used
overcommit
=
node
.
ram_size_with_overcommit
reserved
=
node
.
instance_set
.
aggregate
(
r
=
Sum
(
'ram_size'
))[
'r'
]
or
0
free
=
overcommit
-
reserved
return
ram_size
<
unused
and
ram_size
<
free
def
processor_usage
(
node
):
"""Get a number indicating processor usage on the node.
Lower values indicate lower usage.
"""
return
0
# TODO replace mock value with data from monitor
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