-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
+#
+# NEPI, a framework to manage network experiments
+# Copyright (C) 2013 INRIA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation;
+#
+# 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, see <http://www.gnu.org/licenses/>.
+#
+# Author: Claudio Freire <claudio-daniel.freire@inria.fr>
+# Alina Quereilhac <alina.quereilhac@inria.fr>
+#
import threading
import Queue
import traceback
import sys
+import os
N_PROCS = None
-class ParallelMap(object):
+class WorkerThread(threading.Thread):
+ class QUIT:
+ pass
+
+ def run(self):
+ while True:
+ task = self.queue.get()
+
+ if task is self.QUIT:
+ self.queue.task_done()
+ break
+
+ try:
+ try:
+ callable, args, kwargs = task
+ rv = callable(*args, **kwargs)
+
+ if self.rvqueue is not None:
+ self.rvqueue.put(rv)
+ finally:
+ self.queue.task_done()
+ except:
+ traceback.print_exc(file = sys.stderr)
+ self.delayed_exceptions.append(sys.exc_info())
+
+ def attach(self, queue, rvqueue, delayed_exceptions):
+ self.queue = queue
+ self.rvqueue = rvqueue
+ self.delayed_exceptions = delayed_exceptions
+
+ def quit(self):
+ self.queue.put(self.QUIT)
+
+class ParallelRun(object):
def __init__(self, maxthreads = None, maxqueue = None, results = True):
- global N_PROCS
+ self.maxqueue = maxqueue
+ self.maxthreads = maxthreads
+ self.queue = Queue.Queue(self.maxqueue or 0)
+
+ self.delayed_exceptions = []
+
+ if results:
+ self.rvqueue = Queue.Queue()
+ else:
+ self.rvqueue = None
+
+ self.initialize_workers()
+
+ def initialize_workers(self):
+ global N_PROCS
+
+ maxthreads = self.maxthreads
+
+ # Compute maximum number of threads allowed by the system
if maxthreads is None:
if N_PROCS is None:
try:
- f = open("/proc/cpuinfo")
- try:
+ with open("/proc/cpuinfo") as f:
N_PROCS = sum("processor" in l for l in f)
- finally:
- f.close()
except:
pass
maxthreads = N_PROCS
if maxthreads is None:
maxthreads = 4
+
+ self.workers = []
+
+ # initialize workers
+ for x in xrange(maxthreads):
+ worker = WorkerThread()
+ worker.attach(self.queue, self.rvqueue, self.delayed_exceptions)
+ worker.setDaemon(True)
- self.queue = Queue.Queue(maxqueue or 0)
+ self.workers.append(worker)
- self.workers = [ threading.Thread(target = self.worker)
- for x in xrange(maxthreads) ]
-
- self.delayed_exceptions = []
-
- if results:
- self.rvqueue = Queue.Queue()
- else:
- self.rvqueue = None
+ def __del__(self):
+ self.destroy()
+
+ def empty(self):
+ while True:
+ try:
+ self.queue.get(block = False)
+ self.queue.task_done()
+ except Queue.Empty:
+ break
+
+ def destroy(self):
+ self.join()
+
+ del self.workers[:]
def put(self, callable, *args, **kwargs):
self.queue.put((callable, args, kwargs))
self.queue.put_nowait((callable, args, kwargs))
def start(self):
- for thread in self.workers:
- thread.start()
+ for worker in self.workers:
+ if not worker.isAlive():
+ worker.start()
def join(self):
- for thread in self.workers:
- # That's the shutdown signal
- self.queue.put(None)
-
+ # Wait until all queued tasks have been processed
self.queue.join()
- for thread in self.workers:
- thread.join()
-
+
+ for worker in self.workers:
+ worker.quit()
+
+ for worker in self.workers:
+ worker.join()
+
+ def sync(self):
if self.delayed_exceptions:
typ,val,loc = self.delayed_exceptions[0]
+ del self.delayed_exceptions[:]
raise typ,val,loc
-
- def sync(self):
- self.queue.join()
- def worker(self):
- while True:
- task = self.queue.get()
- if task is None:
- self.queue.task_done()
- break
-
- try:
- try:
- callable, args, kwargs = task
- rv = callable(*args, **kwargs)
-
- if self.rvqueue is not None:
- self.rvqueue.put(rv)
- finally:
- self.queue.task_done()
- except:
- traceback.print_exc(file = sys.stderr)
- self.delayed_exceptions.append(sys.exc_info())
-
def __iter__(self):
if self.rvqueue is not None:
while True:
except Queue.Empty:
raise StopIteration
-
-class ParallelFilter(ParallelMap):
- class _FILTERED:
- pass
-
- def __filter(self, x):
- if self.filter_condition(x):
- return x
- else:
- return self._FILTERED
-
- def __init__(self, filter_condition, maxthreads = None, maxqueue = None):
- super(ParallelFilter, self).__init__(maxthreads, maxqueue, True)
- self.filter_condition = filter_condition
-
- def put(self, what):
- super(ParallelFilter, self).put(self.__filter, what)
-
- def put_nowait(self, what):
- super(ParallelFilter, self).put_nowait(self.__filter, what)
-
- def __iter__(self):
- for rv in super(ParallelFilter, self).__iter__():
- if rv is not self._FILTERED:
- yield rv
-
-class ParallelRun(ParallelMap):
- def __run(self, x):
- fn, args, kwargs = x
- return fn(*args, **kwargs)
-
- def __init__(self, maxthreads = None, maxqueue = None):
- super(ParallelRun, self).__init__(maxthreads, maxqueue, True)
-
- def put(self, what, *args, **kwargs):
- super(ParallelRun, self).put(self.__run, (what, args, kwargs))
-
- def put_nowait(self, what, *args, **kwargs):
- super(ParallelRun, self).put_nowait(self.__filter, (what, args, kwargs))
-
-
-def pmap(mapping, iterable, maxthreads = None, maxqueue = None):
- mapper = ParallelMap(
- maxthreads = maxthreads,
- maxqueue = maxqueue,
- results = True)
- mapper.start()
- for elem in iterable:
- mapper.put(elem)
- return list(mapper)
-
-def pfilter(condition, iterable, maxthreads = None, maxqueue = None):
- filtrer = ParallelFilter(
- condition,
- maxthreads = maxthreads,
- maxqueue = maxqueue)
- filtrer.start()
- for elem in iterable:
- filtrer.put(elem)
- return list(filtrer)
-
git://git.onelab.eu / nepi.git / blobdiff