def test_print_formatting(self):
        def a():
            pass

        def b():
            a()

        func_cols = {1: ("name", 48), 0: ("ncall", 5), 2: ("tsub", 8)}
        thread_cols = {1: ("name", 48), 0: ("ttot", 8)}

        yappi.start()
        a()
        b()
        yappi.stop()
        fs = yappi.get_func_stats()
        cs = fs[1].children
        ts = yappi.get_thread_stats()
        # fs.print_all(out=sys.stderr, columns={1:("name", 70), })
        # cs.print_all(out=sys.stderr, columns=func_cols)
        # ts.print_all(out=sys.stderr, columns=thread_cols)
        # cs.print_all(out=sys.stderr, columns={})

        self.assertRaises(yappi.YappiError, fs.print_all, columns={1: ("namee", 9)})
        self.assertRaises(yappi.YappiError, cs.print_all, columns={1: ("dd", 0)})
        self.assertRaises(yappi.YappiError, ts.print_all, columns={1: ("tidd", 0)})

    def stop_profiler(self):
        """
        Stop yappi and write the stats to the output directory.
        Return the path of the yappi statistics file.
        """
        if not self.profiler_running:
            raise RuntimeError("Profiler is not running")

        if not HAS_YAPPI:
            raise RuntimeError("Yappi cannot be found. Plase install the yappi library using your preferred package "
                               "manager and restart Tribler afterwards.")

        yappi.stop()

        yappi_stats = yappi.get_func_stats()
        yappi_stats.sort("tsub")

        log_dir = os.path.join(self.session.config.get_state_dir(), 'logs')
        file_path = os.path.join(log_dir, 'yappi_%s.stats' % self.profiler_start_time)
        # Make the log directory if it does not exist
        if not os.path.exists(log_dir):
            os.makedirs(log_dir)

        yappi_stats.save(file_path, type='callgrind')
        yappi.clear_stats()
        self.profiler_running = False
        return file_path

 def setUp(self):
     # reset everything back to default
     yappi.stop()
     yappi.clear_stats()
     yappi.set_clock_type('cpu') # reset to default clock type
     yappi.set_context_id_callback(None)
     yappi.set_context_name_callback(None)

    def test_filter(self):
        def a(): pass
        def b(): a()
        def c(): b()

        _TCOUNT = 5

        ts = []
        yappi.start()
        for i in range(_TCOUNT):
            t = threading.Thread(target=c)
            t.start()
            ts.append(t)

        for t in ts:
            t.join()

        yappi.stop()

        fstats = yappi.get_func_stats(filter={"ctx_id":9})
        self.assertTrue(fstats.empty())
        fstats = yappi.get_func_stats(filter={"ctx_id":0, "name":"c"}) # main thread
        self.assertTrue(fstats.empty())

        for i in range(1, _TCOUNT):
            fstats = yappi.get_func_stats(filter={"ctx_id":i, "name":"a", 
                "ncall":1})
            self.assertEqual(fstats.pop().ncall, 1)
            fstats = yappi.get_func_stats(filter={"ctx_id":i, "name":"b"})
            self.assertEqual(fstats.pop().ncall, 1)
            fstats = yappi.get_func_stats(filter={"ctx_id":i, "name":"c"})
            self.assertEqual(fstats.pop().ncall, 1)

    def test_producer_consumer_with_queues(self):
        # we currently just stress yappi, no functionality test is done here.
        yappi.start()
        import time
        if utils.is_py3x():
            from queue import Queue
        else:
            from Queue import Queue
        from threading import Thread
        WORKER_THREAD_COUNT = 50
        WORK_ITEM_COUNT = 2000
        def worker():
            while True:
                item = q.get()                
                # do the work with item
                q.task_done()

        q = Queue()
        for i in range(WORKER_THREAD_COUNT):
            t = Thread(target=worker)
            t.daemon = True
            t.start()
             
        for item in range(WORK_ITEM_COUNT):
            q.put(item)
        q.join()# block until all tasks are done
        #yappi.get_func_stats().sort("callcount").print_all()
        yappi.stop()

    def test_callback(self):
        self.context_id = 0
        yappi.set_context_id_callback(lambda: self.context_id)
        yappi.start()
        a()
        self.context_id = 1
        a()
        self.context_id = 2
        a()

        # Re-schedule context 1.
        self.context_id = 1
        a()
        yappi.stop()

        threadstats = yappi.get_thread_stats().sort('id', 'ascending')
        self.assertEqual(3, len(threadstats))
        self.assertEqual(0, threadstats[0].id)
        self.assertEqual(1, threadstats[1].id)
        self.assertEqual(2, threadstats[2].id)

        self.assertEqual(1, threadstats[0].sched_count)
        self.assertEqual(2, threadstats[1].sched_count)  # Context 1 ran twice.
        self.assertEqual(1, threadstats[2].sched_count)

        funcstats = yappi.get_func_stats()
        self.assertEqual(4, utils.find_stat_by_name(funcstats, 'a').ncall)

 def test_merge_load_different_clock_types(self):
     import threading
     yappi.start(builtins=True)
     def a(): b()
     def b(): c()
     def c(): pass
     t = threading.Thread(target=a)
     t.start()
     t.join()
     yappi.get_func_stats().sort("name", "asc").save("ystats1.ys")
     yappi.stop()
     yappi.clear_stats()
     yappi.start(builtins=False)
     t = threading.Thread(target=a)
     t.start()
     t.join()
     yappi.get_func_stats().save("ystats2.ys")
     yappi.stop()
     self.assertRaises(_yappi.error, yappi.set_clock_type, "wall")
     yappi.clear_stats()
     yappi.set_clock_type("wall")
     yappi.start()
     t = threading.Thread(target=a)
     t.start()
     t.join()
     yappi.get_func_stats().save("ystats3.ys")
     self.assertRaises(yappi.YappiError, yappi.YFuncStats().add("ystats1.ys").add, "ystats3.ys")
     stats = yappi.YFuncStats(["ystats1.ys", "ystats2.ys"]).sort("name")
     fsa = utils.find_stat_by_name(stats, "a")
     fsb = utils.find_stat_by_name(stats, "b")
     fsc = utils.find_stat_by_name(stats, "c")
     self.assertEqual(fsa.ncall, 2)
     self.assertEqual(fsa.ncall, fsb.ncall, fsc.ncall)

    def test_pause_resume(self):
        yappi.set_context_id_callback(lambda: self.context_id)
        yappi.set_clock_type('wall')

        # Start in context 0.
        self.context_id = 0
        yappi.start()
        time.sleep(0.08)

        # Switch to context 1.
        self.context_id = 1
        time.sleep(0.05)

        # Switch back to context 0.
        self.context_id = 0
        time.sleep(0.07)

        yappi.stop()

        t_stats = yappi.get_thread_stats().sort('id', 'ascending')
        self.assertEqual(2, len(t_stats))
        self.assertEqual(0, t_stats[0].id)
        self.assertEqual(2, t_stats[0].sched_count)
        self.assertTrue(0.15 < t_stats[0].ttot < 0.3)

        self.assertEqual(1, t_stats[1].id)
        self.assertEqual(1, t_stats[1].sched_count)
        # Context 1 was first scheduled 0.08 sec after context 0.
        self.assertTrue(0.1 < t_stats[1].ttot < 0.2 )

    def test_profile_single_context(self):
        
        def id_callback():
            return self.callback_count
        def a():
            pass

        self.callback_count = 1
        yappi.set_context_id_callback(id_callback)
        yappi.start(profile_threads=False)
        a() # context-id:1
        self.callback_count = 2
        a() # context-id:2
        stats = yappi.get_func_stats()
        fsa = utils.find_stat_by_name(stats, "a")
        self.assertEqual(fsa.ncall, 1)
        yappi.stop()
        yappi.clear_stats()
        
        self.callback_count = 1
        yappi.start() # profile_threads=True
        a() # context-id:1
        self.callback_count = 2
        a() # context-id:2
        stats = yappi.get_func_stats()
        fsa = utils.find_stat_by_name(stats, "a")
        self.assertEqual(fsa.ncall, 2)

 def test_yappi_overhead(self):  
     import time
     LOOP_COUNT = 10000
     def a(): pass
     def b():
         for i in range(LOOP_COUNT): a()
     t0 = time.time()
     yappi.start()
     b()
     yappi.stop()
     time_with_yappi = time.time() - t0
     t0 = time.time()
     b()
     time_without_yappi = time.time() - t0
     if time_without_yappi == 0:
         time_without_yappi = 0.000001
         
     # in latest v0.82, I calculated this as close to "7.0" in my machine.
     # however, %83 of this overhead is coming from tickcount(). The other %17
     # seems to have been evenly distributed to the internal bookkeeping 
     # structures/algorithms which seems acceptable. Note that our test only 
     # tests one function being profiled at-a-time in a short interval. 
     # profiling high number of functions in a small time
     # is a different beast, (which is pretty unlikely in most applications)
     # So as a conclusion: I cannot see any optimization window for Yappi that
     # is worth implementing as we will only optimize %17 of the time.
     sys.stderr.write("\r\nYappi puts %0.1f times overhead to the profiled application in average.\r\n" % \
         (time_with_yappi / time_without_yappi))        

 def wrapped(*args, **kwargs):
     yappi.start()
     result = func(*args, **kwargs)
     yappi.stop()
     prof_file = "%s.%s" % (func.__name__, time.time())
     #prof_file = "callgrind.a.1"
     yappi.get_func_stats().save(prof_file, "ystat")
     return result

 def test_concurrent_futures(self):
     yappi.start()
     from concurrent.futures import ThreadPoolExecutor
     with ThreadPoolExecutor(max_workers=5) as executor:
         f = executor.submit(pow, 5, 2)
         self.assertEqual(f.result(), 25)        
     time.sleep(1.0)
     yappi.stop()

def _stop_profiling(filename, format):
    logging.debug("Stopping CPU profiling")
    with _lock:
        if yappi.is_running():
            yappi.stop()
            stats = yappi.get_func_stats()
            stats.save(filename, format)
            yappi.clear_stats()

    def stop(self):
        if not yappi.is_running():
            raise UsageError("CPU profiler is not running")

        logging.info("Stopping CPU profiling")
        yappi.stop()
        stats = yappi.get_func_stats()
        stats.save(self.filename, self.format)
        yappi.clear_stats()

    def cmd_stop(self, args):
        """stop profiling"""
        print "Profile results:"
        import yappi  # We do the import here so that we won't barf if run normally and yappi not available

        yappi.get_func_stats().print_all(
            columns={0: ("name", 50), 1: ("ncall", 5), 2: ("tsub", 8), 3: ("ttot", 8), 4: ("tavg", 8)}
        )
        yappi.get_thread_stats().print_all()
        yappi.stop()

 def do_action(self):
     action = self.cleaned_data['action']
     if action == 'start':
         yappi.start()
     elif action == 'start_with_builtins':
         yappi.start(builtins=True)
     elif action == 'stop':
         yappi.stop()
     elif action == 'reset':
         yappi.clear_stats()
     return action

def profile():
    """
    Code profiler using YAPPI
    http://code.google.com/p/yappi
    """
    import yappi
    yappi.start()
    start(False)
    yappi.stop()
    for pstat in yappi.get_stats(yappi.SORTTYPE_TSUB):
        print pstat

    def _stop_profiling(self):
        with lock:
            if not yappi.is_running():
                raise http.Error(http.BAD_REQUEST, "profile is not running")

            log.info("Stopping profiling, writing profile to %r",
                     self.config.profile.filename)
            yappi.stop()
            stats = yappi.get_func_stats()
            stats.save(self.config.profile.filename, type="pstat")
            yappi.clear_stats()

def main():
    print('Main TID: {}'.format(gettid()))
    args = Bunch(channel=None,
                 devices=[],
                 generate=False,
                 ui='main.ui')
    yappi.start()
    exit_value = epyqlib.__main__.main(args=args)
    yappi.stop()
    yappi.get_func_stats().save('yappi.stats', type='pstat')
    yappi.get_thread_stats().print_all()
    return exit_value

 def test_subsequent_profile(self):
     import threading
     WORKER_COUNT = 5
     def a(): pass
     def b(): pass
     def c(): pass
     
     _timings = {"a_1":3,"b_1":2,"c_1":1,}
     
     yappi.start()
     def g(): pass
     g()
     yappi.stop()
     yappi.clear_stats()
     _yappi._set_test_timings(_timings)
     yappi.start()
     
     _dummy = []
     for i in range(WORKER_COUNT):
         t = threading.Thread(target=a)
         t.start()
         t.join()
     for i in range(WORKER_COUNT):
         t = threading.Thread(target=b)
         t.start()
         _dummy.append(t)
         t.join()
     for i in range(WORKER_COUNT):
         t = threading.Thread(target=a)
         t.start()
         t.join()
     for i in range(WORKER_COUNT):
         t = threading.Thread(target=c)
         t.start()
         t.join()    
     yappi.stop()    
     yappi.start()
     def f():
         pass
     f() 
     stats = yappi.get_func_stats()
     fsa = utils.find_stat_by_name(stats, 'a')
     fsb = utils.find_stat_by_name(stats, 'b')
     fsc = utils.find_stat_by_name(stats, 'c')
     self.assertEqual(fsa.ncall, 10)
     self.assertEqual(fsb.ncall, 5)
     self.assertEqual(fsc.ncall, 5)
     self.assertEqual(fsa.ttot, fsa.tsub, 30)
     self.assertEqual(fsb.ttot, fsb.tsub, 10)
     self.assertEqual(fsc.ttot, fsc.tsub, 5)
     
     # MACOSx optimizes by only creating one worker thread
     self.assertTrue(len(yappi.get_thread_stats()) >= 2)