author | Augie Fackler <augie@google.com> |
Sun, 18 Feb 2018 14:25:03 -0500 | |
changeset 36310 | ea62c2df882d |
parent 35453 | 44fd4cfc6c0a |
child 36835 | 5bc7ff103081 |
permissions | -rw-r--r-- |
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# worker.py - master-slave parallelism support |
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# |
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# Copyright 2013 Facebook, Inc. |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import errno |
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import os |
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import signal |
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import sys |
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import threading |
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import time |
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from .i18n import _ |
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from . import ( |
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encoding, |
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error, |
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pycompat, |
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scmutil, |
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util, |
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) |
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def countcpus(): |
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'''try to count the number of CPUs on the system''' |
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# posix |
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try: |
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n = int(os.sysconf(r'SC_NPROCESSORS_ONLN')) |
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if n > 0: |
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return n |
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except (AttributeError, ValueError): |
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pass |
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# windows |
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try: |
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n = int(encoding.environ['NUMBER_OF_PROCESSORS']) |
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if n > 0: |
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return n |
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except (KeyError, ValueError): |
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pass |
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return 1 |
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def _numworkers(ui): |
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s = ui.config('worker', 'numcpus') |
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if s: |
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try: |
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n = int(s) |
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if n >= 1: |
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return n |
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except ValueError: |
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raise error.Abort(_('number of cpus must be an integer')) |
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return min(max(countcpus(), 4), 32) |
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if pycompat.isposix or pycompat.iswindows: |
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_startupcost = 0.01 |
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else: |
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_startupcost = 1e30 |
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def worthwhile(ui, costperop, nops): |
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'''try to determine whether the benefit of multiple processes can |
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outweigh the cost of starting them''' |
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linear = costperop * nops |
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workers = _numworkers(ui) |
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benefit = linear - (_startupcost * workers + linear / workers) |
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return benefit >= 0.15 |
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def worker(ui, costperarg, func, staticargs, args): |
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'''run a function, possibly in parallel in multiple worker |
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processes. |
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returns a progress iterator |
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costperarg - cost of a single task |
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func - function to run |
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staticargs - arguments to pass to every invocation of the function |
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args - arguments to split into chunks, to pass to individual |
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workers |
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''' |
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enabled = ui.configbool('worker', 'enabled') |
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if enabled and worthwhile(ui, costperarg, len(args)): |
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return _platformworker(ui, func, staticargs, args) |
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return func(*staticargs + (args,)) |
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def _posixworker(ui, func, staticargs, args): |
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rfd, wfd = os.pipe() |
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workers = _numworkers(ui) |
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oldhandler = signal.getsignal(signal.SIGINT) |
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signal.signal(signal.SIGINT, signal.SIG_IGN) |
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pids, problem = set(), [0] |
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def killworkers(): |
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# unregister SIGCHLD handler as all children will be killed. This |
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# function shouldn't be interrupted by another SIGCHLD; otherwise pids |
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# could be updated while iterating, which would cause inconsistency. |
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signal.signal(signal.SIGCHLD, oldchldhandler) |
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# if one worker bails, there's no good reason to wait for the rest |
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for p in pids: |
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try: |
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os.kill(p, signal.SIGTERM) |
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except OSError as err: |
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if err.errno != errno.ESRCH: |
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raise |
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def waitforworkers(blocking=True): |
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for pid in pids.copy(): |
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p = st = 0 |
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while True: |
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try: |
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p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG)) |
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break |
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except OSError as e: |
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if e.errno == errno.EINTR: |
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diff
changeset
|
118 |
continue |
5069a8a40b1b
worker: make waitforworkers reentrant
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diff
changeset
|
119 |
elif e.errno == errno.ECHILD: |
30425
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
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parents:
30424
diff
changeset
|
120 |
# child would already be reaped, but pids yet been |
03f7aa2bd0e3
worker: discard waited pid by anyone who noticed it first
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parents:
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diff
changeset
|
121 |
# updated (maybe interrupted just after waitpid) |
03f7aa2bd0e3
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changeset
|
122 |
pids.discard(pid) |
03f7aa2bd0e3
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diff
changeset
|
123 |
break |
30414
5069a8a40b1b
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parents:
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diff
changeset
|
124 |
else: |
5069a8a40b1b
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parents:
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diff
changeset
|
125 |
raise |
31063
18fb3cf572b4
worker: ignore meaningless exit status indication returned by os.waitpid()
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parents:
30639
diff
changeset
|
126 |
if not p: |
18fb3cf572b4
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diff
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|
127 |
# skip subsequent steps, because child process should |
18fb3cf572b4
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diff
changeset
|
128 |
# be still running in this case |
18fb3cf572b4
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|
129 |
continue |
18fb3cf572b4
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diff
changeset
|
130 |
pids.discard(p) |
18fb3cf572b4
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diff
changeset
|
131 |
st = _exitstatus(st) |
30410
7a5d6e2fd2d5
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changeset
|
132 |
if st and not problem[0]: |
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changeset
|
133 |
problem[0] = st |
30415
e8fb03cfbbde
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parents:
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diff
changeset
|
134 |
def sigchldhandler(signum, frame): |
e8fb03cfbbde
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diff
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|
135 |
waitforworkers(blocking=False) |
30424
f2d13eb85198
worker: kill workers after all zombie processes are reaped
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parents:
30423
diff
changeset
|
136 |
if problem[0]: |
f2d13eb85198
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parents:
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diff
changeset
|
137 |
killworkers() |
30415
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parents:
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diff
changeset
|
138 |
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
|
139 |
ui.flush() |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
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parents:
32043
diff
changeset
|
140 |
parentpid = os.getpid() |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
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parents:
18637
diff
changeset
|
141 |
for pargs in partition(args, workers): |
32112
31763785094b
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parents:
32043
diff
changeset
|
142 |
# make sure we use os._exit in all worker code paths. otherwise the |
31763785094b
worker: rewrite error handling so os._exit covers all cases
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parents:
32043
diff
changeset
|
143 |
# worker may do some clean-ups which could cause surprises like |
31763785094b
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parents:
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diff
changeset
|
144 |
# deadlock. see sshpeer.cleanup for example. |
31763785094b
worker: rewrite error handling so os._exit covers all cases
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parents:
32043
diff
changeset
|
145 |
# 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
|
146 |
# 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
|
147 |
# completes, and other exception handler (dispatch.py) can lead to |
31763785094b
worker: rewrite error handling so os._exit covers all cases
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parents:
32043
diff
changeset
|
148 |
# unexpected code path without os._exit. |
31763785094b
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parents:
32043
diff
changeset
|
149 |
ret = -1 |
31763785094b
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parents:
32043
diff
changeset
|
150 |
try: |
31763785094b
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parents:
32043
diff
changeset
|
151 |
pid = os.fork() |
31763785094b
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parents:
32043
diff
changeset
|
152 |
if pid == 0: |
31763785094b
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parents:
32043
diff
changeset
|
153 |
signal.signal(signal.SIGINT, oldhandler) |
31763785094b
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parents:
32043
diff
changeset
|
154 |
signal.signal(signal.SIGCHLD, oldchldhandler) |
30521
86cd09bc13ba
worker: use os._exit for posix worker in all cases
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parents:
30425
diff
changeset
|
155 |
|
32112
31763785094b
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parents:
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diff
changeset
|
156 |
def workerfunc(): |
31763785094b
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parents:
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diff
changeset
|
157 |
os.close(rfd) |
31763785094b
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parents:
32043
diff
changeset
|
158 |
for i, item in func(*(staticargs + (pargs,))): |
31763785094b
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parents:
32043
diff
changeset
|
159 |
os.write(wfd, '%d %s\n' % (i, item)) |
31763785094b
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parents:
32043
diff
changeset
|
160 |
return 0 |
31763785094b
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parents:
32043
diff
changeset
|
161 |
|
31763785094b
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Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
162 |
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
|
163 |
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
|
164 |
if os.getpid() == parentpid: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
165 |
raise |
31763785094b
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parents:
32043
diff
changeset
|
166 |
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
|
167 |
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
|
168 |
ui.traceback(force=force) |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
169 |
finally: |
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
170 |
if os.getpid() != parentpid: |
31118
a91c62752d08
worker: flush messages written by child processes before exit
Yuya Nishihara <yuya@tcha.org>
parents:
31063
diff
changeset
|
171 |
try: |
a91c62752d08
worker: flush messages written by child processes before exit
Yuya Nishihara <yuya@tcha.org>
parents:
31063
diff
changeset
|
172 |
ui.flush() |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
173 |
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
|
174 |
pass |
30521
86cd09bc13ba
worker: use os._exit for posix worker in all cases
Jun Wu <quark@fb.com>
parents:
30425
diff
changeset
|
175 |
finally: |
32112
31763785094b
worker: rewrite error handling so os._exit covers all cases
Jun Wu <quark@fb.com>
parents:
32043
diff
changeset
|
176 |
os._exit(ret & 255) |
30413 | 177 |
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
|
178 |
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
|
179 |
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
|
180 |
def cleanup(): |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
181 |
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
|
182 |
waitforworkers() |
30415
e8fb03cfbbde
worker: add a SIGCHLD handler to collect worker immediately
Jun Wu <quark@fb.com>
parents:
30414
diff
changeset
|
183 |
signal.signal(signal.SIGCHLD, oldchldhandler) |
18709
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
184 |
status = problem[0] |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
185 |
if status: |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
186 |
if status < 0: |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
187 |
os.kill(os.getpid(), -status) |
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
188 |
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
|
189 |
try: |
30396 | 190 |
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
|
191 |
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
|
192 |
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
|
193 |
except: # re-raises |
18709
9955fc5ee24b
worker: handle worker failures more aggressively
Bryan O'Sullivan <bryano@fb.com>
parents:
18708
diff
changeset
|
194 |
killworkers() |
18638
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
195 |
cleanup() |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
196 |
raise |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
197 |
cleanup() |
047110c0e2a8
worker: allow a function to be run in multiple worker processes
Bryan O'Sullivan <bryano@fb.com>
parents:
18637
diff
changeset
|
198 |
|
18707
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
199 |
def _posixexitstatus(code): |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
200 |
'''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
|
201 |
os.spawnv |
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
202 |
|
d1a2b086d058
worker: on error, exit similarly to the first failing worker
Bryan O'Sullivan <bryano@fb.com>
parents:
18638
diff
changeset
|
203 |
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
|
204 |
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
|
205 |
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
|
206 |
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
|
207 |
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
|
208 |
|
35427
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
209 |
def _windowsworker(ui, func, staticargs, args): |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
210 |
class Worker(threading.Thread): |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
211 |
def __init__(self, taskqueue, resultqueue, func, staticargs, |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
212 |
group=None, target=None, name=None, verbose=None): |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
213 |
threading.Thread.__init__(self, group=group, target=target, |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
214 |
name=name, verbose=verbose) |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
215 |
self._taskqueue = taskqueue |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
216 |
self._resultqueue = resultqueue |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
217 |
self._func = func |
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
218 |
self._staticargs = staticargs |
35428
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
219 |
self._interrupted = False |
35432
86b8cc1f244e
worker: make windows workers daemons
Wojciech Lis <wlis@fb.com>
parents:
35431
diff
changeset
|
220 |
self.daemon = True |
35428
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
221 |
self.exception = None |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
222 |
|
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
223 |
def interrupt(self): |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
224 |
self._interrupted = True |
35427
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
225 |
|
02b36e860e0b
workers: implemented worker on windows
Wojciech Lis <wlis@fb.com>
parents:
34646
diff
changeset
|
226 |
def run(self): |
35428
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
227 |
try: |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
228 |
while not self._taskqueue.empty(): |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
229 |
try: |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
230 |
args = self._taskqueue.get_nowait() |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
231 |
for res in self._func(*self._staticargs + (args,)): |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
232 |
self._resultqueue.put(res) |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
233 |
# threading doesn't provide a native way to |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
234 |
# interrupt execution. handle it manually at every |
71427ff1dff8
workers: handling exceptions in windows workers
Wojciech Lis <wlis@fb.com>
parents:
35427
diff
changeset
|
235 |
# iteration. |
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236 |
if self._interrupted: |
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237 |
return |
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238 |
except util.empty: |
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239 |
break |
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240 |
except Exception as e: |
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241 |
# store the exception such that the main thread can resurface |
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# it as if the func was running without workers. |
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243 |
self.exception = e |
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244 |
raise |
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245 |
|
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threads = [] |
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def trykillworkers(): |
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# Allow up to 1 second to clean worker threads nicely |
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cleanupend = time.time() + 1 |
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for t in threads: |
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251 |
t.interrupt() |
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for t in threads: |
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253 |
remainingtime = cleanupend - time.time() |
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254 |
t.join(remainingtime) |
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255 |
if t.is_alive(): |
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256 |
# pass over the workers joining failure. it is more |
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257 |
# important to surface the inital exception than the |
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258 |
# fact that one of workers may be processing a large |
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259 |
# task and does not get to handle the interruption. |
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260 |
ui.warn(_("failed to kill worker threads while " |
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261 |
"handling an exception\n")) |
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262 |
return |
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263 |
|
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264 |
workers = _numworkers(ui) |
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265 |
resultqueue = util.queue() |
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taskqueue = util.queue() |
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267 |
# partition work to more pieces than workers to minimize the chance |
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268 |
# of uneven distribution of large tasks between the workers |
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269 |
for pargs in partition(args, workers * 20): |
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270 |
taskqueue.put(pargs) |
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271 |
for _i in range(workers): |
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272 |
t = Worker(taskqueue, resultqueue, func, staticargs) |
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threads.append(t) |
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274 |
t.start() |
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275 |
try: |
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276 |
while len(threads) > 0: |
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277 |
while not resultqueue.empty(): |
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278 |
yield resultqueue.get() |
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279 |
threads[0].join(0.05) |
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280 |
finishedthreads = [_t for _t in threads if not _t.is_alive()] |
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281 |
for t in finishedthreads: |
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282 |
if t.exception is not None: |
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283 |
raise t.exception |
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284 |
threads.remove(t) |
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285 |
except (Exception, KeyboardInterrupt): # re-raises |
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286 |
trykillworkers() |
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287 |
raise |
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288 |
while not resultqueue.empty(): |
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289 |
yield resultqueue.get() |
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290 |
|
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291 |
if pycompat.iswindows: |
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292 |
_platformworker = _windowsworker |
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293 |
else: |
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294 |
_platformworker = _posixworker |
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295 |
_exitstatus = _posixexitstatus |
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296 |
|
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297 |
def partition(lst, nslices): |
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298 |
'''partition a list into N slices of roughly equal size |
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299 |
|
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300 |
The current strategy takes every Nth element from the input. If |
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301 |
we ever write workers that need to preserve grouping in input |
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302 |
we should consider allowing callers to specify a partition strategy. |
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303 |
|
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304 |
mpm is not a fan of this partitioning strategy when files are involved. |
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|
305 |
In his words: |
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306 |
|
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|
307 |
Single-threaded Mercurial makes a point of creating and visiting |
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|
308 |
files in a fixed order (alphabetical). When creating files in order, |
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|
309 |
a typical filesystem is likely to allocate them on nearby regions on |
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|
310 |
disk. Thus, when revisiting in the same order, locality is maximized |
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|
311 |
and various forms of OS and disk-level caching and read-ahead get a |
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312 |
chance to work. |
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313 |
|
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314 |
This effect can be quite significant on spinning disks. I discovered it |
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|
315 |
circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
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|
316 |
Tarring a repo and copying it to another disk effectively randomized |
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|
317 |
the revlog ordering on disk by sorting the revlogs by hash and suddenly |
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|
318 |
performance of my kernel checkout benchmark dropped by ~10x because the |
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|
319 |
"working set" of sectors visited no longer fit in the drive's cache and |
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|
320 |
the workload switched from streaming to random I/O. |
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|
321 |
|
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|
322 |
What we should really be doing is have workers read filenames from a |
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|
323 |
ordered queue. This preserves locality and also keeps any worker from |
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|
324 |
getting more than one file out of balance. |
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|
325 |
''' |
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|
326 |
for i in range(nslices): |
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|
327 |
yield lst[i::nslices] |