/usr/lib/python2.7/dist-packages/asrun/parallel_cp.py is in code-aster-run 1.13.1-2.
This file is owned by root:root, with mode 0o644.
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# ==============================================================================
# COPYRIGHT (C) 1991 - 2003 EDF R&D WWW.CODE-ASTER.ORG
# THIS PROGRAM IS FREE SOFTWARE; YOU CAN REDISTRIBUTE IT AND/OR MODIFY
# IT UNDER THE TERMS OF THE GNU GENERAL PUBLIC LICENSE AS PUBLISHED BY
# THE FREE SOFTWARE FOUNDATION; EITHER VERSION 2 OF THE LICENSE, OR
# (AT YOUR OPTION) ANY LATER VERSION.
#
# THIS PROGRAM IS DISTRIBUTED IN THE HOPE THAT IT WILL BE USEFUL, BUT
# WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF
# MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE GNU
# GENERAL PUBLIC LICENSE FOR MORE DETAILS.
#
# YOU SHOULD HAVE RECEIVED A COPY OF THE GNU GENERAL PUBLIC LICENSE
# ALONG WITH THIS PROGRAM; IF NOT, WRITE TO EDF R&D CODE_ASTER,
# 1 AVENUE DU GENERAL DE GAULLE, 92141 CLAMART CEDEX, FRANCE.
# ==============================================================================
"""parallel_copy [options] tracker_path source_directory destination_directory
tracker_path : This directory MUST be shared by all nodes.
It stores which sources are available.
source_directory : The directory to copy
destination_directory : (local) directory in which content will be copied.
This module allows to copy a source directory into multiple destinations.
"""
__sup_doc__ = """This uses a (very simplified*) peet-to-peer files sharing : each destination
becomes a new seed for the others.
(*) - use standard cp/rcp/scp commands,
- does not share blocks of files but only the entire source directory.
The number of available seeds after n cycles = (leech_limit + 1)^n
Example : For copying a directory on 100 nodes if a unique copy
takes 10 s, the copy will be completed after 70 s or 50 s
(leech_limit=1 or 2).
#cycle leech_limit=1 leech_limit=2
1 2 3
2 4 9
3 8 27
4 16 81
5 32 243(*)
6 64 729
7 128(*) 2187
8 256 6561
9 512 19683
"""
import os
import pprint
import time
from socket import gethostname
from optparse import OptionParser
from asrun.common.i18n import _
from asrun.mystring import print3
from asrun.common.utils import now
DEBUG = False
DEBUG_copy_delay = 0.
default_leech_limit = 2
class CopyError(Exception):
"""Local exception"""
class PARALLEL_COPY:
"""Copy /dirsrc into /dest
- get from 'tracker' an available 'repository'.
- copy repository:/dirsrc into /dest
- when done, adds 'leech:/dest' in the repositories list in '/dirsrc/repositories'
number of available source after n cycles = (p + 1)^n
with p = number of connections to a source
"""
max_attempt_src = 300 # number of attempts to get a source
interval_src = 1.0 # delay between two attempts
max_attempt_lock = 100 # number of attempts to lock repositories list
interval_lock = 0.5 # delay between two attempts
def __init__(self, tracker, master, dest, leech_limit, verbose=False, run=None):
"""Initializations
"""
self.tracker = os.path.normpath(os.path.realpath(tracker))
if not os.path.exists(self.tracker):
try:
os.makedirs(self.tracker)
except (OSError, IOError):
pass
self.master = os.path.normpath(os.path.realpath(master))
self.dest = os.path.normpath(os.path.realpath(dest))
self.lock = None
self.leech = '%s:%s' % (gethostname() , self.dest)
self.leech_limit = leech_limit
assert self.leech_limit < 5, \
"It seems dangerous and inefficient to have too much leechs per seed."
self.verbose = verbose
# use functions from AsterRun object
self.run = run
def copy(self, src, dest):
"""Copy 'src' file or directory to 'dest'.
"""
opts = {}
if self.verbose:
print3(_(u'(parallel_copy) - destination : %s - seed : %s') % (self.dest, src))
if self.verbose:
print3(_(u' COPY %s into %s') % (src, dest))
opts['verbose'] = True
opts['alt_comment'] = False
if self.run is None:
src = src.split(':')[-1]
dest = dest.split(':')[-1]
iret = os.system('cp -rp %s %s' % (src, dest))
else:
iret = self.run.Copy(dest, src, **opts)
if DEBUG_copy_delay > 0.:
time.sleep(DEBUG_copy_delay)
return iret
def repo_filename(self):
"""Return repositories list filename
"""
return os.path.join(self.tracker, 'repositories')
def lock_filename(self):
"""Return lock filename
"""
return os.path.join(self.tracker, 'lock')
def acquire(self):
"""Acquire a lock.
"""
if self.lock is not None:
return
flock = self.lock_filename()
for i in range(self.max_attempt_lock):
if i > 0:
time.sleep(self.interval_lock)
try:
fd = os.open(flock, os.O_RDWR | os.O_CREAT | os.O_EXCL, 0644)
os.write(fd, self.leech)
os.close(fd)
if DEBUG:
print3(u' LOCKED (attempt %d) by %s' % (i+1, self.leech))
self.lock = 'locked'
return
except OSError:
pass
raise CopyError, _('can not lock the repository (timeout after %0.f)') \
% (self.max_attempt_lock * self.interval_lock)
def release(self):
"""Release current lock.
"""
if self.lock is None:
raise CopyError, _('No lock to release')
flock = self.lock_filename()
if DEBUG:
print3(u' RELEASED by', self.leech)
if os.path.exists(flock):
os.remove(flock)
self.lock = None
def save_repository(self, d_repo):
"""Save the repositories_list into repositories file.
"""
assert self.lock is not None
open(self.repo_filename(), 'w').write("repository = %s" % pprint.pformat(d_repo))
def read_repository(self):
"""Reads and returns the repositories list.
"""
assert self.lock is not None
d = {}
execfile(self.repo_filename(), d)
d_repo = d['repository']
return d_repo
def update_repository(self, repos):
"""Add some repositories to the list.
"""
if not type(repos) in (list, tuple):
repos = [repos,]
self.acquire()
d_repo = self.read_repository()
for src in repos:
d_repo[src] = min(d_repo.get(src, 0) + 1, self.leech_limit)
self.save_repository(d_repo)
self.release()
def get_repository(self):
"""Ask 'tracker' for an available repository
"""
src = ''
for i in range(self.max_attempt_src):
if i > 0:
time.sleep(self.interval_src)
self.acquire()
repo = self.repo_filename()
if not os.path.exists(repo):
self.save_repository({ self.master : self.leech_limit})
d_repo = self.read_repository()
if len(d_repo) > 0:
lval = [(v, k) for k, v in d_repo.items()]
lval.sort() # reverse=True does not exists in python < 2.4
lval.reverse()
disp, src = lval[0]
if disp == 0: # no source available
self.release()
continue
d_repo[src] -= 1
self.save_repository(d_repo)
self.release()
return src
self.release()
raise CopyError, 'no repository available in the delay (%.0f)' \
% (self.max_attempt_src * self.interval_src)
def start(self):
"""Start the copy
"""
if self.verbose:
print3(_(u'(parallel_copy) - destination : %s - start time : %s') \
% (self.dest, now(datefmt="")))
# get a source
src = self.get_repository()
# copy
if src == self.dest or src == self.leech:
print3(_(u'source and destination are identical'))
return
if DEBUG:
spl = src.split(':')
host_src = ''
if len(spl) > 0:
host_src = spl[0].split('.')[0] + ':'
host_dest = gethostname().split('.')[0] + ':'
print3(u'GRAPH "%s%s" -> "%s%s";' % (host_src, os.path.basename(src), host_dest, os.path.basename(self.dest)))
if not os.path.exists(self.dest):
os.makedirs(self.dest)
iret = self.copy('%s/*' % src, self.dest)
# remove repositories file in dest
dest_repo = os.path.join(self.dest, os.path.basename(self.repo_filename()))
if os.path.exists(dest_repo):
os.remove(dest_repo)
l_repo = [src,]
l_repo.extend([self.leech,] * self.leech_limit)
self.update_repository(l_repo)
if self.verbose:
print3(_(u'(parallel_copy) - destination : %s - end time : %s') \
% (self.dest, now(datefmt="")))
def estimate_num_cycle(num_dest, num_src=1, leech_limit=2):
"""Return the number of cycles needed."""
from math import log, ceil
ninf = ceil(log(1. * num_dest / num_src) / log(leech_limit + 1.))
return ninf
def main():
"""Start"""
# command arguments parser
parser = OptionParser(usage=__doc__)
parser.add_option('--with-as_run', dest='with_as_run',
action='store_true', default=False,
help="use as_run functions to allow remote copy")
parser.add_option('--remote_copy_protocol', dest='remote_copy_protocol',
action='store', default='RCP',
help='remote protocol used to copy files and directories')
parser.add_option('--remote_shell_protocol', dest='remote_shell_protocol',
action='store', default='RSH',
help='remote protocol used for shell commands')
parser.add_option('--leech_limit', dest='leech_limit',
action='store', default=default_leech_limit, metavar='NUM',
help='maximum number of connections to each seed (default %d)' % default_leech_limit)
parser.add_option('--silent', dest='verbose',
action='store_false', default=True,
help='run silently (do not print start/end time...)')
parser.add_option('--long_help', dest='long_help',
action='store_true', default=False,
help='print complete help (with example) and exit')
opts, l_args = parser.parse_args()
if opts.long_help:
parser.usage += __sup_doc__
parser.print_help()
parser.exit(1)
if opts.with_as_run:
from asrun.system import AsterSystemMinimal
run = AsterSystemMinimal(remote_copy_protocol=opts.remote_copy_protocol,
remote_shell_protocol=opts.remote_shell_protocol)
else:
run = None
if len(l_args) == 0:
parser.error('invalid arguments')
copy = PARALLEL_COPY(leech_limit=opts.leech_limit, run=run, verbose=opts.verbose, *l_args)
copy.start()
if __name__ == '__main__':
main()
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