import timeit from django.dispatch import dispatcher if False: print "old" signal_recv_test = object() signal_noargs_test = object() signal_onearg_test = object() signal_tenargs_test = object() else: print "new" from django.dispatch import dispatcher signal_recv_test = dispatcher.Signal(providing_args=['arg0']) signal_noargs_test = dispatcher.Signal(providing_args=[]) signal_onearg_test = dispatcher.Signal(providing_args=['arg0']) signal_tenargs_test = dispatcher.Signal(providing_args=['arg%s' % i for i in range(10)]) def no_op_kwargs(**kwargs): pass def no_op_no_args(sender): pass def no_op_onearg(sender, arg0): pass def no_op_tenargs(sender, arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9): pass def call_(i, f): for i in range(i): f() receivers = [] x = """ can add params multi-reg idempotent strip extra args to recv based on set -> dict (extensibility later. worth it?) error from signal handler breaks all signals (any push-back?) it's mildly annoying that a signal doesn't know its own name. using a dict for receivers means signals out-of-order. never promised, but still to be avoided if not huge diff? switch all core and contrib to signal.send rather than dispatcher.send? original, including pyc generation 0 receivers test 2.16365003586 1 receiver test 18.8934309483 1.24702501297 10 receivers test 101.300621986 4.43934082985 weak dict, weak=True, keithb "faster_signals.diff" Mar 18 2008 0 receivers test 4.87185907364 1 receiver test 11.0454790592 0.341604948044 10 receivers test 52.751529932 4.38265109062 weak dict, weak=False, keithb "faster_signals.diff" Mar 18 2008 0 receivers test 4.82329916954 1 receiver test 11.550688982 0.359184026718 10 receivers test 60.9468040466 4.46081781387 weak_dict, including pyc generation 0 receivers test 1.70886898041 1 receiver test 11.0185530186 1.23874211311 10 receivers test 50.5068600178 4.67185306549 strong_dict, including pyc generation 0 receivers test 1.86286401749 1 receiver test 6.80570101738 1.24223089218 10 receivers test 23.5818219185 4.7426469326 strong_list, including pyc generation 0 receivers test 2.36390304565 1 receiver test 6.74138212204 0.336266994476 10 receivers test 18.7774899006 4.27188205719 strong_list, including pyc generation; no api enforcement 0 receivers test 2.36659097672 1 receiver test 4.90005588531 0.337324142456 10 receivers test 16.6197218895 4.20589017868 ----- separately, comparing performance of argument matching: with arg matching: 0 arg bench 6.56428813934 1 arg bench 7.65555596352 10 arg bench 19.9225678444 without arg matching: 0 arg bench 5.6941409111 1 arg bench 6.54712295532 10 arg bench 16.4016561508 """ prep_timeit = """ from django.dispatch import dispatcher from __main__ import call_, no_op_kwargs, no_op_no_args from __main__ import signal_recv_test from __main__ import signal_noargs_test from __main__ import signal_onearg_test from __main__ import signal_tenargs_test """ ###1) vary on receivers, accepting kwargs ###2) vary on number of args, not accepting kwargs ####1) vary on receivers, accepting kwargs: 0, 1, 10, 100 print "0 receivers test", timeit.Timer("dispatcher.send(signal_recv_test, arg0=1)", prep_timeit).timeit() print "0 receivers test direct", timeit.Timer("signal_recv_test.send(None, arg0=1)", prep_timeit).timeit() dispatcher.connect(no_op_kwargs, signal_recv_test) print "1 receiver test", timeit.Timer("dispatcher.send(signal_recv_test, arg0=1)", prep_timeit).timeit(), timeit.Timer("no_op_kwargs()", prep_timeit).timeit() print "1 receiver test direct", timeit.Timer("signal_recv_test.send(None, arg0=1)", prep_timeit).timeit(), timeit.Timer("no_op_kwargs()", prep_timeit).timeit() for i in range(9): def no_op_kwargs(**kwargs): pass receivers.append(no_op_kwargs) dispatcher.connect(no_op_kwargs, signal_recv_test) print "10 receivers test", timeit.Timer("dispatcher.send(signal_recv_test, arg0=1)", prep_timeit).timeit(), timeit.Timer("call_(10, no_op_kwargs)", prep_timeit).timeit() #for i in range(90): # def no_op_kwargs(**kwargs): # pass # receivers.append(no_op_kwargs) # dispatcher.connect(no_op_kwargs, signal_recv_test) #print "100 receivers test", timeit.Timer("dispatcher.send(signal_recv_test, arg0=1)", prep_timeit).timeit(), timeit.Timer("call_(100, no_op_kwargs)", prep_timeit).timeit() # ####2) vary on number of args, not accepting dispatcher.connect(no_op_no_args, signal_noargs_test) dispatcher.connect(no_op_no_args, signal_onearg_test) dispatcher.connect(no_op_no_args, signal_tenargs_test) print "0 API enforce bench", timeit.Timer("dispatcher.send(signal_noargs_test)", prep_timeit).timeit(), timeit.Timer("no_op_no_args(None)", prep_timeit).timeit() print "1 API enforce bench", timeit.Timer("dispatcher.send(signal_onearg_test, arg0=1)", prep_timeit).timeit(), timeit.Timer("no_op_no_args(None)", prep_timeit).timeit() bench = timeit.Timer("dispatcher.send(signal_tenargs_test, %s)" % ','.join([("arg%s=%s" % (i,i)) for i in range(10)]), prep_timeit).timeit() lower = timeit.Timer("no_op_no_args(None)", prep_timeit).timeit() print "10 API enforce bench", bench, lower # #dispatcher.disconnect(no_op_no_args, signal_noargs_test) #dispatcher.disconnect(no_op_no_args, signal_onearg_test) #dispatcher.disconnect(no_op_no_args, signal_tenargs_test) # ###3) vary on number of args, accepting dispatcher.connect(no_op_no_args, signal_noargs_test) dispatcher.connect(no_op_onearg, signal_onearg_test) dispatcher.connect(no_op_tenargs, signal_tenargs_test) print "0 arg bench", timeit.Timer("dispatcher.send(signal_noargs_test)", prep_timeit).timeit() print "1 arg bench", timeit.Timer("dispatcher.send(signal_onearg_test, arg0=1)", prep_timeit).timeit() print "10 arg bench", timeit.Timer("dispatcher.send(signal_tenargs_test, %s)" % ','.join([("arg%s=%s" % (i,i)) for i in range(10)]), prep_timeit).timeit()