# 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 as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# 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
# 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
N_PROCS = None
-THREADCACHE = []
-THREADCACHEPID = None
-
class WorkerThread(threading.Thread):
class QUIT:
pass
- class REASSIGNED:
- pass
-
+
def run(self):
while True:
task = self.queue.get()
- if task is None:
- self.done = True
- self.queue.task_done()
- continue
- elif task is self.QUIT:
- self.done = True
+
+ if task is self.QUIT:
self.queue.task_done()
break
- elif task is self.REASSIGNED:
- continue
- else:
- self.done = False
-
+
try:
try:
callable, args, kwargs = task
except:
traceback.print_exc(file = sys.stderr)
self.delayed_exceptions.append(sys.exc_info())
-
- def waitdone(self):
- while not self.queue.empty() and not self.done:
- self.queue.join()
-
+
def attach(self, queue, rvqueue, delayed_exceptions):
- if self.isAlive():
- self.waitdone()
- oldqueue = self.queue
self.queue = queue
self.rvqueue = rvqueue
self.delayed_exceptions = delayed_exceptions
- if self.isAlive():
- oldqueue.put(self.REASSIGNED)
-
- def detach(self):
- if self.isAlive():
- self.waitdone()
- self.oldqueue = self.queue
- self.queue = Queue.Queue()
- self.rvqueue = None
- self.delayed_exceptions = []
-
- def detach_signal(self):
- if self.isAlive():
- self.oldqueue.put(self.REASSIGNED)
- del self.oldqueue
-
+
def quit(self):
self.queue.put(self.QUIT)
- self.join()
-class ParallelMap(object):
+class ParallelRun(object):
def __init__(self, maxthreads = None, maxqueue = None, results = True):
- global N_PROCS
- global THREADCACHE
- global THREADCACHEPID
+ 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.queue = Queue.Queue(maxqueue or 0)
-
- self.delayed_exceptions = []
-
- if results:
- self.rvqueue = Queue.Queue()
- else:
- self.rvqueue = None
-
- # Check threadcache
- if THREADCACHEPID is None or THREADCACHEPID != os.getpid():
- del THREADCACHE[:]
- THREADCACHEPID = os.getpid()
-
+
self.workers = []
+
+ # initialize workers
for x in xrange(maxthreads):
- t = None
- if THREADCACHE:
- try:
- t = THREADCACHE.pop()
- except:
- pass
- if t is None:
- t = WorkerThread()
- t.setDaemon(True)
- else:
- t.waitdone()
- t.attach(self.queue, self.rvqueue, self.delayed_exceptions)
- self.workers.append(t)
+ worker = WorkerThread()
+ worker.attach(self.queue, self.rvqueue, self.delayed_exceptions)
+ worker.setDaemon(True)
+
+ self.workers.append(worker)
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):
- # Check threadcache
- global THREADCACHE
- global THREADCACHEPID
- if THREADCACHEPID is None or THREADCACHEPID != os.getpid():
- del THREADCACHE[:]
- THREADCACHEPID = os.getpid()
+ self.join()
- for worker in self.workers:
- worker.waitdone()
- for worker in self.workers:
- worker.detach()
- for worker in self.workers:
- worker.detach_signal()
- THREADCACHE.extend(self.workers)
del self.workers[:]
def put(self, callable, *args, **kwargs):
self.queue.put_nowait((callable, args, kwargs))
def start(self):
- for thread in self.workers:
- if not thread.isAlive():
- thread.start()
+ for worker in self.workers:
+ if not worker.isAlive():
+ worker.start()
def join(self):
- for thread in self.workers:
- # That's the sync signal
- self.queue.put(None)
-
+ # Wait until all queued tasks have been processed
self.queue.join()
- for thread in self.workers:
- thread.waitdone()
-
- if self.delayed_exceptions:
- typ,val,loc = self.delayed_exceptions[0]
- del self.delayed_exceptions[:]
- raise typ,val,loc
-
- self.destroy()
+
+ for worker in self.workers:
+ worker.quit()
+
+ for worker in self.workers:
+ worker.join()
def sync(self):
- self.queue.join()
if self.delayed_exceptions:
typ,val,loc = self.delayed_exceptions[0]
del self.delayed_exceptions[:]
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)
- rv = list(mapper)
- mapper.join()
- return rv
-
-def pfilter(condition, iterable, maxthreads = None, maxqueue = None):
- filtrer = ParallelFilter(
- condition,
- maxthreads = maxthreads,
- maxqueue = maxqueue)
- filtrer.start()
- for elem in iterable:
- filtrer.put(elem)
- rv = list(filtrer)
- filtrer.join()
- return rv
-
git://git.onelab.eu / nepi.git / blobdiff