1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import logging
import multiprocessing as mp
import os
import signal
import time
from queue import Empty
from typing import Any, Dict, List, Set, Tuple
from .api import RequestQueue, TimerClient, TimerRequest, TimerServer
__all__ = ['LocalTimerClient', 'MultiprocessingRequestQueue', 'LocalTimerServer']
class LocalTimerClient(TimerClient):
"""
Client side of ``LocalTimerServer``. This client is meant to be used
on the same host that the ``LocalTimerServer`` is running on and uses
pid to uniquely identify a worker. This is particularly useful in situations
where one spawns a subprocess (trainer) per GPU on a host with multiple
GPU devices.
"""
def __init__(self, mp_queue):
super().__init__()
self._mp_queue = mp_queue
def acquire(self, scope_id, expiration_time):
pid = os.getpid()
acquire_request = TimerRequest(pid, scope_id, expiration_time)
self._mp_queue.put(acquire_request)
def release(self, scope_id):
pid = os.getpid()
release_request = TimerRequest(pid, scope_id, -1)
self._mp_queue.put(release_request)
class MultiprocessingRequestQueue(RequestQueue):
"""
A ``RequestQueue`` backed by python ``multiprocessing.Queue``
"""
def __init__(self, mp_queue: mp.Queue):
super().__init__()
self._mp_queue = mp_queue
def size(self) -> int:
return self._mp_queue.qsize()
def get(self, size, timeout: float) -> List[TimerRequest]:
requests = []
wait = timeout
for _ in range(0, size):
start = time.time()
try:
r = self._mp_queue.get(block=True, timeout=wait)
except Empty:
break
requests.append(r)
wait = wait - (time.time() - start)
if wait <= 0:
break
return requests
class LocalTimerServer(TimerServer):
"""
Server that works with ``LocalTimerClient``. Clients are expected to be
subprocesses to the parent process that is running this server. Each host
in the job is expected to start its own timer server locally and each
server instance manages timers for local workers (running on processes
on the same host).
"""
def __init__(
self, mp_queue: mp.Queue, max_interval: float = 60, daemon: bool = True
):
super().__init__(MultiprocessingRequestQueue(mp_queue), max_interval, daemon)
self._timers: Dict[Tuple[Any, str], TimerRequest] = {}
def register_timers(self, timer_requests: List[TimerRequest]) -> None:
for request in timer_requests:
pid = request.worker_id
scope_id = request.scope_id
expiration_time = request.expiration_time
# negative expiration is a proxy for a release call
if expiration_time < 0:
self._timers.pop((pid, scope_id), None)
else:
self._timers[(pid, scope_id)] = request
def clear_timers(self, worker_ids: Set[int]) -> None:
for (pid, scope_id) in list(self._timers.keys()):
if pid in worker_ids:
self._timers.pop((pid, scope_id))
def get_expired_timers(self, deadline: float) -> Dict[Any, List[TimerRequest]]:
# pid -> [timer_requests...]
expired_timers: Dict[Any, List[TimerRequest]] = {}
for request in self._timers.values():
if request.expiration_time <= deadline:
expired_scopes = expired_timers.setdefault(request.worker_id, [])
expired_scopes.append(request)
return expired_timers
def _reap_worker(self, worker_id: int) -> bool:
try:
os.kill(worker_id, signal.SIGKILL)
return True
except ProcessLookupError:
logging.info(f"Process with pid={worker_id} does not exist. Skipping")
return True
except Exception as e:
logging.error(f"Error terminating pid={worker_id}", exc_info=e)
return False
|
