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Commit
ac6a96ae
authored
Jan 31, 2018
by
fshahinfar1
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implement LSTR algorithm
parent
2b1ec786
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with
51 additions
and
2 deletions
+51
-2
simso/schedulers/LSTR.py
+51
-2
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simso/schedulers/LSTR.py
View file @
ac6a96ae
...
...
@@ -9,4 +9,54 @@ class LSTR(Scheduler):
"""
def
init
(
self
):
pass
\ No newline at end of file
self
.
ready_list
=
[]
self
.
timer
=
Timer
(
self
.
sim
,
LSTR
.
virtual_event
,
(
self
,
self
.
processors
[
0
]),
1
,
one_shot
=
False
)
self
.
timer
.
start
()
def
virtual_event
(
self
,
cpu
):
self
.
reschedule
(
cpu
)
def
reschedule
(
self
,
cpu
):
if
self
.
ready_list
:
cpu
.
resched
()
def
LSTR_rank
(
self
,
job
):
"""
calculates rank described in LSTR algorithm for given job
return value should be non-negative, negative value means that job has passed deadline
"""
if
not
job
:
return
0
# print(job.absolute_deadline, job.deadline)
din
=
job
.
absolute_deadline
-
self
.
sim
.
now_ms
()
if
din
==
0
:
return
0
return
job
.
ret
/
din
def
on_activate
(
self
,
job
):
self
.
ready_list
.
append
(
job
)
self
.
reschedule
(
job
.
cpu
)
def
on_terminated
(
self
,
job
):
self
.
ready_list
.
remove
(
job
)
self
.
reschedule
(
job
.
cpu
)
def
schedule
(
self
,
cpu
):
decision
=
[]
if
self
.
ready_list
:
self
.
ready_list
.
sort
(
key
=
self
.
LSTR_rank
,
reverse
=
True
)
number_of_processors
=
len
(
self
.
processors
)
jobs
=
self
.
ready_list
[:
number_of_processors
]
available_proc
=
[
p
for
p
in
self
.
processors
if
p
.
running
not
in
jobs
]
for
job
in
jobs
:
if
job
.
is_running
():
continue
for
cpu
in
available_proc
:
job_on_cpu_rank
=
self
.
LSTR_rank
(
cpu
.
running
)
if
job_on_cpu_rank
<
self
.
LSTR_rank
(
job
):
decision
.
append
((
job
,
cpu
))
available_proc
.
remove
(
cpu
)
break
return
decision
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