add the multiprocessing package to fulfill PEP 371

Doc/includes/mp_benchmarks.py

@@ -0,0 +1,235 @@
+#
+# Simple benchmarks for the multiprocessing package
+#
+
+import time, sys, multiprocessing, threading, Queue, gc
+
+if sys.platform == 'win32':
+    _timer = time.clock
+else:
+    _timer = time.time
+
+delta = 1
+
+
+#### TEST_QUEUESPEED
+
+def queuespeed_func(q, c, iterations):
+    a = '0' * 256
+    c.acquire()
+    c.notify()
+    c.release()
+
+    for i in xrange(iterations):
+        q.put(a)
+
+    q.put('STOP')
+
+def test_queuespeed(Process, q, c):
+    elapsed = 0
+    iterations = 1
+
+    while elapsed < delta:
+        iterations *= 2
+
+        p = Process(target=queuespeed_func, args=(q, c, iterations))
+        c.acquire()
+        p.start()
+        c.wait()
+        c.release()
+
+        result = None
+        t = _timer()
+
+        while result != 'STOP':
+            result = q.get()
+
+        elapsed = _timer() - t
+
+        p.join()
+
+    print iterations, 'objects passed through the queue in', elapsed, 'seconds'
+    print 'average number/sec:', iterations/elapsed
+
+
+#### TEST_PIPESPEED
+
+def pipe_func(c, cond, iterations):
+    a = '0' * 256
+    cond.acquire()
+    cond.notify()
+    cond.release()
+
+    for i in xrange(iterations):
+        c.send(a)
+
+    c.send('STOP')
+
+def test_pipespeed():
+    c, d = multiprocessing.Pipe()
+    cond = multiprocessing.Condition()
+    elapsed = 0
+    iterations = 1
+
+    while elapsed < delta:
+        iterations *= 2
+
+        p = multiprocessing.Process(target=pipe_func,
+                                    args=(d, cond, iterations))
+        cond.acquire()
+        p.start()
+        cond.wait()
+        cond.release()
+
+        result = None
+        t = _timer()
+
+        while result != 'STOP':
+            result = c.recv()
+
+        elapsed = _timer() - t
+        p.join()
+
+    print iterations, 'objects passed through connection in',elapsed,'seconds'
+    print 'average number/sec:', iterations/elapsed
+
+
+#### TEST_SEQSPEED
+
+def test_seqspeed(seq):
+    elapsed = 0
+    iterations = 1
+
+    while elapsed < delta:
+        iterations *= 2
+
+        t = _timer()
+
+        for i in xrange(iterations):
+            a = seq[5]
+
+        elapsed = _timer()-t
+
+    print iterations, 'iterations in', elapsed, 'seconds'
+    print 'average number/sec:', iterations/elapsed
+
+
+#### TEST_LOCK
+
+def test_lockspeed(l):
+    elapsed = 0
+    iterations = 1
+
+    while elapsed < delta:
+        iterations *= 2
+
+        t = _timer()
+
+        for i in xrange(iterations):
+            l.acquire()
+            l.release()
+
+        elapsed = _timer()-t
+
+    print iterations, 'iterations in', elapsed, 'seconds'
+    print 'average number/sec:', iterations/elapsed
+
+
+#### TEST_CONDITION
+
+def conditionspeed_func(c, N):
+    c.acquire()
+    c.notify()
+
+    for i in xrange(N):
+        c.wait()
+        c.notify()
+
+    c.release()
+
+def test_conditionspeed(Process, c):
+    elapsed = 0
+    iterations = 1
+
+    while elapsed < delta:
+        iterations *= 2
+
+        c.acquire()
+        p = Process(target=conditionspeed_func, args=(c, iterations))
+        p.start()
+
+        c.wait()
+
+        t = _timer()
+
+        for i in xrange(iterations):
+            c.notify()
+            c.wait()
+
+        elapsed = _timer()-t
+
+        c.release()
+        p.join()
+
+    print iterations * 2, 'waits in', elapsed, 'seconds'
+    print 'average number/sec:', iterations * 2 / elapsed
+
+####
+
+def test():
+    manager = multiprocessing.Manager()
+
+    gc.disable()
+
+    print '\n\t######## testing Queue.Queue\n'
+    test_queuespeed(threading.Thread, Queue.Queue(),
+                    threading.Condition())
+    print '\n\t######## testing multiprocessing.Queue\n'
+    test_queuespeed(multiprocessing.Process, multiprocessing.Queue(),
+                    multiprocessing.Condition())
+    print '\n\t######## testing Queue managed by server process\n'
+    test_queuespeed(multiprocessing.Process, manager.Queue(),
+                    manager.Condition())
+    print '\n\t######## testing multiprocessing.Pipe\n'
+    test_pipespeed()
+
+    print
+
+    print '\n\t######## testing list\n'
+    test_seqspeed(range(10))
+    print '\n\t######## testing list managed by server process\n'
+    test_seqspeed(manager.list(range(10)))
+    print '\n\t######## testing Array("i", ..., lock=False)\n'
+    test_seqspeed(multiprocessing.Array('i', range(10), lock=False))
+    print '\n\t######## testing Array("i", ..., lock=True)\n'
+    test_seqspeed(multiprocessing.Array('i', range(10), lock=True))
+
+    print
+
+    print '\n\t######## testing threading.Lock\n'
+    test_lockspeed(threading.Lock())
+    print '\n\t######## testing threading.RLock\n'
+    test_lockspeed(threading.RLock())
+    print '\n\t######## testing multiprocessing.Lock\n'
+    test_lockspeed(multiprocessing.Lock())
+    print '\n\t######## testing multiprocessing.RLock\n'
+    test_lockspeed(multiprocessing.RLock())
+    print '\n\t######## testing lock managed by server process\n'
+    test_lockspeed(manager.Lock())
+    print '\n\t######## testing rlock managed by server process\n'
+    test_lockspeed(manager.RLock())
+
+    print
+
+    print '\n\t######## testing threading.Condition\n'
+    test_conditionspeed(threading.Thread, threading.Condition())
+    print '\n\t######## testing multiprocessing.Condition\n'
+    test_conditionspeed(multiprocessing.Process, multiprocessing.Condition())
+    print '\n\t######## testing condition managed by a server process\n'
+    test_conditionspeed(multiprocessing.Process, manager.Condition())
+
+    gc.enable()
+
+if __name__ == '__main__':
+    multiprocessing.freeze_support()
+    test()