Mercurial > hg
annotate mercurial/worker.py @ 33251:a5cb2e4460de
transaction: track new obsmarkers in the 'changes' mapping
The obsstore collaborate with transaction to make sure we track all the
obsmarkers added during a transaction. This will be useful for various usages:
hooks, caches, better output, etc.
This is the seconds kind of data added to tr.changes (first one was added revisions)
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Tue, 27 Jun 2017 02:45:09 +0200 |
parents | 954489932c4f |
children | 75979c8d4572 |
rev | line source |
---|---|
18635
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
1 # worker.py - master-slave parallelism support |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
2 # |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
3 # Copyright 2013 Facebook, Inc. |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
4 # |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
5 # This software may be used and distributed according to the terms of the |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
6 # GNU General Public License version 2 or any later version. |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
7 |
25992
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
8 from __future__ import absolute_import |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
9 |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
10 import errno |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
11 import os |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
12 import signal |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
13 import sys |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
14 |
2d76f8a2d831
worker: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
15 from .i18n import _ |
30396 | 16 from . import ( |
30635
a150173da1c1
py3: replace os.environ with encoding.environ (part 2 of 5)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30521
diff
changeset
|
17 encoding, |
30396 | 18 error, |
30639
d524c88511a7
py3: replace os.name with pycompat.osname (part 1 of 2)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30635
diff
changeset
|
19 pycompat, |
30521
86cd09bc13ba
worker: use os._exit for posix worker in all cases
Jun Wu <quark@fb.com>
parents:
30425
diff
changeset
|
20 scmutil, |
30396 | 21 util, |
22 ) | |
18635
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
23 |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
24 def countcpus(): |
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
25 '''try to count the number of CPUs on the system''' |
26568
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
26 |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
27 # posix |
18635
fed06dd07665
worker: count the number of CPUs
Bryan O'Sullivan <bryano@fb.com>
parents:
diff
changeset
|
28 try: |
32611
954489932c4f
py3: pass str in os.sysconf()
Pulkit Goyal <7895pulkit@gmail.com>
parents:
32112
diff
changeset
|
29 n = int(os.sysconf(r'SC_NPROCESSORS_ONLN')) |
26568
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
30 if n > 0: |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
31 return n |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
32 except (AttributeError, ValueError): |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
33 pass |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
34 |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
35 # windows |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
36 try: |
30635
a150173da1c1
py3: replace os.environ with encoding.environ (part 2 of 5)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30521
diff
changeset
|
37 n = int(encoding.environ['NUMBER_OF_PROCESSORS']) |
26568
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
38 if n > 0: |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
39 return n |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
40 except (KeyError, ValueError): |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
41 pass |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
42 |
c0501c26b05c
worker: restore old countcpus code (issue4869)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26063
diff
changeset
|
43 return 1 |
18636
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
44 |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
45 def _numworkers(ui): |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
46 s = ui.config('worker', 'numcpus') |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
47 if s: |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
48 try: |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
49 n = int(s) |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
50 if n >= 1: |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
51 return n |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
52 except ValueError: |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
26568
diff
changeset
|
53 raise error.Abort(_('number of cpus must be an integer')) |
18636
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
54 return min(max(countcpus(), 4), 32) |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
55 |
30639
d524c88511a7
py3: replace os.name with pycompat.osname (part 1 of 2)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30635
diff
changeset
|
56 if pycompat.osname == 'posix': |
18636
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
57 _startupcost = 0.01 |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
58 else: |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
59 _startupcost = 1e30 |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
60 |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
61 def worthwhile(ui, costperop, nops): |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
62 '''try to determine whether the benefit of multiple processes can |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
63 outweigh the cost of starting them''' |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
64 linear = costperop * nops |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
65 workers = _numworkers(ui) |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
66 benefit = linear - (_startupcost * workers + linear / workers) |
dcb27c153a40
worker: estimate whether it's worth running a task in parallel
Bryan O'Sullivan <bryano@fb.com>
parents:
18635
diff
changeset
|
67 return benefit >= 0.15 |
18637
ac4dbceeb14a
worker: partition a list (of tasks) into equal-sized chunks
Bryan O'Sullivan <bryano@fb.com>
parents:
18636
diff
changeset
|
68 |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
69 def worker(ui, costperarg, func, staticargs, args): |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
70 '''run a function, possibly in parallel in multiple worker |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
71 processes. |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
72 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
73 returns a progress iterator |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
74 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
75 costperarg - cost of a single task |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
76 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
77 func - function to run |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
78 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
79 staticargs - arguments to pass to every invocation of the function |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
80 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
81 args - arguments to split into chunks, to pass to individual |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
82 workers |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
83 ''' |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
84 if worthwhile(ui, costperarg, len(args)): |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
85 return _platformworker(ui, func, staticargs, args) |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
86 return func(*staticargs + (args,)) |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
87 |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
88 def _posixworker(ui, func, staticargs, args): |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
89 rfd, wfd = os.pipe() |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
90 workers = _numworkers(ui) |
18708
86524a70c0f6
worker: fix a race in SIGINT handling
Bryan O'Sullivan <bryano@fb.com>
parents:
18707
diff
changeset
|
91 oldhandler = signal.getsignal(signal.SIGINT) |
86524a70c0f6
worker: fix a race in SIGINT handling
Bryan O'Sullivan <bryano@fb.com>
parents:
18707
diff
changeset
|
92 signal.signal(signal.SIGINT, signal.SIG_IGN) |
30413 | 93 pids, problem = set(), [0] |
30410
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
94 def killworkers(): |
30423
237b2883cbd8
worker: make sure killworkers() never be interrupted by another SIGCHLD
Yuya Nishihara <yuya@tcha.org>
parents:
30422
diff
changeset
|
95 # unregister SIGCHLD handler as all children will be killed. This |
237b2883cbd8
worker: make sure killworkers() never be interrupted by another SIGCHLD
Yuya Nishihara <yuya@tcha.org>
parents:
30422
diff
changeset
|
96 # function shouldn't be interrupted by another SIGCHLD; otherwise pids |
237b2883cbd8
worker: make sure killworkers() never be interrupted by another SIGCHLD
Yuya Nishihara <yuya@tcha.org>
parents:
30422
diff
changeset
|
97 # could be updated while iterating, which would cause inconsistency. |
237b2883cbd8
worker: make sure killworkers() never be interrupted by another SIGCHLD
Yuya Nishihara <yuya@tcha.org>
parents:
30422
diff
changeset
|
98 signal.signal(signal.SIGCHLD, oldchldhandler) |
30410
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
99 # if one worker bails, there's no good reason to wait for the rest |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
100 for p in pids: |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
101 try: |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
102 os.kill(p, signal.SIGTERM) |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
103 except OSError as err: |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
104 if err.errno != errno.ESRCH: |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
105 raise |
30412
7bc25549e084
worker: allow waitforworkers to be non-blocking
Jun Wu <quark@fb.com>
parents:
30411
diff
changeset
|
106 def waitforworkers(blocking=True): |
30414
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
107 for pid in pids.copy(): |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
108 p = st = 0 |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
109 while True: |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
110 try: |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
111 p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG)) |
30422
0e6ce6313e47
worker: fix missed break on successful waitpid()
Yuya Nishihara <yuya@tcha.org>
parents:
30416
diff
changeset
|
112 break |
30414
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
113 except OSError as e: |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
114 if e.errno == errno.EINTR: |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
115 continue |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
116 elif e.errno == errno.ECHILD: |
30425
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
Yuya Nishihara <yuya@tcha.org>
parents:
30424
diff
changeset
|
117 # child would already be reaped, but pids yet been |
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
Yuya Nishihara <yuya@tcha.org>
parents:
30424
diff
changeset
|
118 # updated (maybe interrupted just after waitpid) |
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
Yuya Nishihara <yuya@tcha.org>
parents:
30424
diff
changeset
|
119 pids.discard(pid) |
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
Yuya Nishihara <yuya@tcha.org>
parents:
30424
diff
changeset
|
120 break |
30414
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
121 else: |
5069a8a40b1b
worker: make waitforworkers reentrant
Jun Wu <quark@fb.com>
parents:
30413
diff
changeset
|
122 raise |
31063
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
123 if not p: |
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
124 # skip subsequent steps, because child process should |
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
125 # be still running in this case |
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
126 continue |
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
127 pids.discard(p) |
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
30639
diff
changeset
|
128 st = _exitstatus(st) |
30410
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
129 if st and not problem[0]: |
7a5d6e2fd2d5
worker: move killworkers and waitforworkers up
Jun Wu <quark@fb.com>
parents:
30396
diff
changeset
|
130 problem[0] = st |
30415
e8fb03cfbbde
worker: add a SIGCHLD handler to collect worker immediately
Jun Wu <quark@fb.com>
parents:
30414
diff
changeset
|
131 def sigchldhandler(signum, frame): |
e8fb03cfbbde
worker: add a SIGCHLD handler to collect worker immediately
Jun Wu <quark@fb.com>
parents:
30414
diff
changeset
|
132 waitforworkers(blocking=False) |
30424
f2d13eb85198
worker: kill workers after all zombie processes are reaped
Yuya Nishihara <yuya@tcha.org>
parents:
30423
diff
changeset
|
133 if problem[0]: |
f2d13eb85198
worker: kill workers after all zombie processes are reaped
Yuya Nishihara <yuya@tcha.org>
parents:
30423
diff
changeset
|
134 killworkers() |
30415
e8fb03cfbbde
worker: add a SIGCHLD handler to collect worker immediately
Jun Wu <quark@fb.com>
parents:
30414
diff
changeset
|
135 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler) |
31696
9d3d56aa1a9f
worker: flush ui buffers before running the worker
David Soria Parra <davidsp@fb.com>
parents:
31119
diff
changeset
|
136 ui.flush() |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
137 parentpid = os.getpid() |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
138 for pargs in partition(args, workers): |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
139 # make sure we use os._exit in all worker code paths. otherwise the |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
140 # worker may do some clean-ups which could cause surprises like |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
141 # deadlock. see sshpeer.cleanup for example. |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
142 # override error handling *before* fork. this is necessary because |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
143 # exception (signal) may arrive after fork, before "pid =" assignment |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
144 # completes, and other exception handler (dispatch.py) can lead to |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
145 # unexpected code path without os._exit. |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
146 ret = -1 |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
147 try: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
148 pid = os.fork() |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
149 if pid == 0: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
150 signal.signal(signal.SIGINT, oldhandler) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
151 signal.signal(signal.SIGCHLD, oldchldhandler) |
30521
86cd09bc13ba
worker: use os._exit for posix worker in all cases
Jun Wu <quark@fb.com>
parents:
30425
diff
changeset
|
152 |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
153 def workerfunc(): |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
154 os.close(rfd) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
155 for i, item in func(*(staticargs + (pargs,))): |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
156 os.write(wfd, '%d %s\n' % (i, item)) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
157 return 0 |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
158 |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
159 ret = scmutil.callcatch(ui, workerfunc) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
160 except: # parent re-raises, child never returns |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
161 if os.getpid() == parentpid: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
162 raise |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
163 exctype = sys.exc_info()[0] |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
164 force = not issubclass(exctype, KeyboardInterrupt) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
165 ui.traceback(force=force) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
166 finally: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
167 if os.getpid() != parentpid: |
31118
a91c62752d08
worker: flush messages written by child processes before exit
Yuya Nishihara <yuya@tcha.org>
parents:
31063
diff
changeset
|
168 try: |
a91c62752d08
worker: flush messages written by child processes before exit
Yuya Nishihara <yuya@tcha.org>
parents:
31063
diff
changeset
|
169 ui.flush() |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
170 except: # never returns, no re-raises |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
171 pass |
30521
86cd09bc13ba
worker: use os._exit for posix worker in all cases
Jun Wu <quark@fb.com>
parents:
30425
diff
changeset
|
172 finally: |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
173 os._exit(ret & 255) |
30413 | 174 pids.add(pid) |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
175 os.close(wfd) |
30924
48dea083f66d
py3: convert the mode argument of os.fdopen to unicodes (1 of 2)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30639
diff
changeset
|
176 fp = os.fdopen(rfd, pycompat.sysstr('rb'), 0) |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
177 def cleanup(): |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
178 signal.signal(signal.SIGINT, oldhandler) |
30416
c27614f2dec1
worker: stop using a separate thread waiting for children
Jun Wu <quark@fb.com>
parents:
30415
diff
changeset
|
179 waitforworkers() |
30415
e8fb03cfbbde
worker: add a SIGCHLD handler to collect worker immediately
Jun Wu <quark@fb.com>
parents:
30414
diff
changeset
|
180 signal.signal(signal.SIGCHLD, oldchldhandler) |
18709
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
181 status = problem[0] |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
182 if status: |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
183 if status < 0: |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
184 os.kill(os.getpid(), -status) |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
185 sys.exit(status) |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
186 try: |
30396 | 187 for line in util.iterfile(fp): |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
188 l = line.split(' ', 1) |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
189 yield int(l[0]), l[1][:-1] |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
190 except: # re-raises |
18709
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
191 killworkers() |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
192 cleanup() |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
193 raise |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
194 cleanup() |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
195 |
18707
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
196 def _posixexitstatus(code): |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
197 '''convert a posix exit status into the same form returned by |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
198 os.spawnv |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
199 |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
200 returns None if the process was stopped instead of exiting''' |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
201 if os.WIFEXITED(code): |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
202 return os.WEXITSTATUS(code) |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
203 elif os.WIFSIGNALED(code): |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
204 return -os.WTERMSIG(code) |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
205 |
30639
d524c88511a7
py3: replace os.name with pycompat.osname (part 1 of 2)
Pulkit Goyal <7895pulkit@gmail.com>
parents:
30635
diff
changeset
|
206 if pycompat.osname != 'nt': |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
207 _platformworker = _posixworker |
18707
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
208 _exitstatus = _posixexitstatus |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
209 |
18637
ac4dbceeb14a
worker: partition a list (of tasks) into equal-sized chunks
Bryan O'Sullivan <bryano@fb.com>
parents:
18636
diff
changeset
|
210 def partition(lst, nslices): |
28181
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
211 '''partition a list into N slices of roughly equal size |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
212 |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
213 The current strategy takes every Nth element from the input. If |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
214 we ever write workers that need to preserve grouping in input |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
215 we should consider allowing callers to specify a partition strategy. |
28292
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
216 |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
217 mpm is not a fan of this partitioning strategy when files are involved. |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
218 In his words: |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
219 |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
220 Single-threaded Mercurial makes a point of creating and visiting |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
221 files in a fixed order (alphabetical). When creating files in order, |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
222 a typical filesystem is likely to allocate them on nearby regions on |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
223 disk. Thus, when revisiting in the same order, locality is maximized |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
224 and various forms of OS and disk-level caching and read-ahead get a |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
225 chance to work. |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
226 |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
227 This effect can be quite significant on spinning disks. I discovered it |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
228 circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
229 Tarring a repo and copying it to another disk effectively randomized |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
230 the revlog ordering on disk by sorting the revlogs by hash and suddenly |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
231 performance of my kernel checkout benchmark dropped by ~10x because the |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
232 "working set" of sectors visited no longer fit in the drive's cache and |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
233 the workload switched from streaming to random I/O. |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
234 |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
235 What we should really be doing is have workers read filenames from a |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
236 ordered queue. This preserves locality and also keeps any worker from |
3eb7faf6d958
worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28181
diff
changeset
|
237 getting more than one file out of balance. |
28181
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
238 ''' |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
239 for i in range(nslices): |
f8efc8a3a991
worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26587
diff
changeset
|
240 yield lst[i::nslices] |