improve patience for slow Hub in client tests

adds a first step in `_wait_for_idle`,
where it waits for all tasks to arrive before waiting for
no tasks to be running.  On a super slow machine,
it was possible for `_wait_for_idle` to return prematurely,
before tasks had even started.

ought to close  #2807

IPython/parallel/tests/test_client.py

@@ -1,502 +1,517 b''
 """Tests for parallel client.py
 
 Authors:
 
 * Min RK
 """
 
 #-------------------------------------------------------------------------------
 #  Copyright (C) 2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
 #-------------------------------------------------------------------------------
 # Imports
 #-------------------------------------------------------------------------------
 
 from __future__ import division
 
 import time
 from datetime import datetime
 from tempfile import mktemp
 
 import zmq
 
 from IPython import parallel
 from IPython.parallel.client import client as clientmod
 from IPython.parallel import error
 from IPython.parallel import AsyncResult, AsyncHubResult
 from IPython.parallel import LoadBalancedView, DirectView
 
 from clienttest import ClusterTestCase, segfault, wait, add_engines
 
 def setup():
     add_engines(4, total=True)
 
 class TestClient(ClusterTestCase):
     
     def test_ids(self):
         n = len(self.client.ids)
         self.add_engines(2)
         self.assertEqual(len(self.client.ids), n+2)
     
     def test_view_indexing(self):
         """test index access for views"""
         self.minimum_engines(4)
         targets = self.client._build_targets('all')[-1]
         v = self.client[:]
         self.assertEqual(v.targets, targets)
         t = self.client.ids[2]
         v = self.client[t]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, t)
         t = self.client.ids[2:4]
         v = self.client[t]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, t)
         v = self.client[::2]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, targets[::2])
         v = self.client[1::3]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, targets[1::3])
         v = self.client[:-3]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, targets[:-3])
         v = self.client[-1]
         self.assertTrue(isinstance(v, DirectView))
         self.assertEqual(v.targets, targets[-1])
         self.assertRaises(TypeError, lambda : self.client[None])
     
     def test_lbview_targets(self):
         """test load_balanced_view targets"""
         v = self.client.load_balanced_view()
         self.assertEqual(v.targets, None)
         v = self.client.load_balanced_view(-1)
         self.assertEqual(v.targets, [self.client.ids[-1]])
         v = self.client.load_balanced_view('all')
         self.assertEqual(v.targets, None)
     
     def test_dview_targets(self):
         """test direct_view targets"""
         v = self.client.direct_view()
         self.assertEqual(v.targets, 'all')
         v = self.client.direct_view('all')
         self.assertEqual(v.targets, 'all')
         v = self.client.direct_view(-1)
         self.assertEqual(v.targets, self.client.ids[-1])
     
     def test_lazy_all_targets(self):
         """test lazy evaluation of rc.direct_view('all')"""
         v = self.client.direct_view()
         self.assertEqual(v.targets, 'all')
         
         def double(x):
             return x*2
         seq = range(100)
         ref = [ double(x) for x in seq ]
         
         # add some engines, which should be used
         self.add_engines(1)
         n1 = len(self.client.ids)
         
         # simple apply
         r = v.apply_sync(lambda : 1)
         self.assertEqual(r, [1] * n1)
         
         # map goes through remotefunction
         r = v.map_sync(double, seq)
         self.assertEqual(r, ref)
 
         # add a couple more engines, and try again
         self.add_engines(2)
         n2 = len(self.client.ids)
         self.assertNotEqual(n2, n1)
         
         # apply
         r = v.apply_sync(lambda : 1)
         self.assertEqual(r, [1] * n2)
         
         # map
         r = v.map_sync(double, seq)
         self.assertEqual(r, ref)
     
     def test_targets(self):
         """test various valid targets arguments"""
         build = self.client._build_targets
         ids = self.client.ids
         idents,targets = build(None)
         self.assertEqual(ids, targets)
     
     def test_clear(self):
         """test clear behavior"""
         self.minimum_engines(2)
         v = self.client[:]
         v.block=True
         v.push(dict(a=5))
         v.pull('a')
         id0 = self.client.ids[-1]
         self.client.clear(targets=id0, block=True)
         a = self.client[:-1].get('a')
         self.assertRaisesRemote(NameError, self.client[id0].get, 'a')
         self.client.clear(block=True)
         for i in self.client.ids:
             self.assertRaisesRemote(NameError, self.client[i].get, 'a')
     
     def test_get_result(self):
         """test getting results from the Hub."""
         c = clientmod.Client(profile='iptest')
         t = c.ids[-1]
         ar = c[t].apply_async(wait, 1)
         # give the monitor time to notice the message
         time.sleep(.25)
         ahr = self.client.get_result(ar.msg_ids)
         self.assertTrue(isinstance(ahr, AsyncHubResult))
         self.assertEqual(ahr.get(), ar.get())
         ar2 = self.client.get_result(ar.msg_ids)
         self.assertFalse(isinstance(ar2, AsyncHubResult))
         c.close()
     
     def test_get_execute_result(self):
         """test getting execute results from the Hub."""
         c = clientmod.Client(profile='iptest')
         t = c.ids[-1]
         cell = '\n'.join([
             'import time',
             'time.sleep(0.25)',
             '5'
         ])
         ar = c[t].execute("import time; time.sleep(1)", silent=False)
         # give the monitor time to notice the message
         time.sleep(.25)
         ahr = self.client.get_result(ar.msg_ids)
         self.assertTrue(isinstance(ahr, AsyncHubResult))
         self.assertEqual(ahr.get().pyout, ar.get().pyout)
         ar2 = self.client.get_result(ar.msg_ids)
         self.assertFalse(isinstance(ar2, AsyncHubResult))
         c.close()
     
     def test_ids_list(self):
         """test client.ids"""
         ids = self.client.ids
         self.assertEqual(ids, self.client._ids)
         self.assertFalse(ids is self.client._ids)
         ids.remove(ids[-1])
         self.assertNotEqual(ids, self.client._ids)
     
     def test_queue_status(self):
         ids = self.client.ids
         id0 = ids[0]
         qs = self.client.queue_status(targets=id0)
         self.assertTrue(isinstance(qs, dict))
         self.assertEqual(sorted(qs.keys()), ['completed', 'queue', 'tasks'])
         allqs = self.client.queue_status()
         self.assertTrue(isinstance(allqs, dict))
         intkeys = list(allqs.keys())
         intkeys.remove('unassigned')
         self.assertEqual(sorted(intkeys), sorted(self.client.ids))
         unassigned = allqs.pop('unassigned')
         for eid,qs in allqs.items():
             self.assertTrue(isinstance(qs, dict))
             self.assertEqual(sorted(qs.keys()), ['completed', 'queue', 'tasks'])
 
     def test_shutdown(self):
         ids = self.client.ids
         id0 = ids[0]
         self.client.shutdown(id0, block=True)
         while id0 in self.client.ids:
             time.sleep(0.1)
             self.client.spin()
         
         self.assertRaises(IndexError, lambda : self.client[id0])
         
     def test_result_status(self):
         pass
         # to be written
     
     def test_db_query_dt(self):
         """test db query by date"""
         hist = self.client.hub_history()
         middle = self.client.db_query({'msg_id' : hist[len(hist)//2]})[0]
         tic = middle['submitted']
         before = self.client.db_query({'submitted' : {'$lt' : tic}})
         after = self.client.db_query({'submitted' : {'$gte' : tic}})
         self.assertEqual(len(before)+len(after),len(hist))
         for b in before:
             self.assertTrue(b['submitted'] < tic)
         for a in after:
             self.assertTrue(a['submitted'] >= tic)
         same = self.client.db_query({'submitted' : tic})
         for s in same:
             self.assertTrue(s['submitted'] == tic)
     
     def test_db_query_keys(self):
         """test extracting subset of record keys"""
         found = self.client.db_query({'msg_id': {'$ne' : ''}},keys=['submitted', 'completed'])
         for rec in found:
             self.assertEqual(set(rec.keys()), set(['msg_id', 'submitted', 'completed']))
     
     def test_db_query_default_keys(self):
         """default db_query excludes buffers"""
         found = self.client.db_query({'msg_id': {'$ne' : ''}})
         for rec in found:
             keys = set(rec.keys())
             self.assertFalse('buffers' in keys, "'buffers' should not be in: %s" % keys)
             self.assertFalse('result_buffers' in keys, "'result_buffers' should not be in: %s" % keys)
     
     def test_db_query_msg_id(self):
         """ensure msg_id is always in db queries"""
         found = self.client.db_query({'msg_id': {'$ne' : ''}},keys=['submitted', 'completed'])
         for rec in found:
             self.assertTrue('msg_id' in rec.keys())
         found = self.client.db_query({'msg_id': {'$ne' : ''}},keys=['submitted'])
         for rec in found:
             self.assertTrue('msg_id' in rec.keys())
         found = self.client.db_query({'msg_id': {'$ne' : ''}},keys=['msg_id'])
         for rec in found:
             self.assertTrue('msg_id' in rec.keys())
     
     def test_db_query_get_result(self):
         """pop in db_query shouldn't pop from result itself"""
         self.client[:].apply_sync(lambda : 1)
         found = self.client.db_query({'msg_id': {'$ne' : ''}})
         rc2 = clientmod.Client(profile='iptest')
         # If this bug is not fixed, this call will hang:
         ar = rc2.get_result(self.client.history[-1])
         ar.wait(2)
         self.assertTrue(ar.ready())
         ar.get()
         rc2.close()
     
     def test_db_query_in(self):
         """test db query with '$in','$nin' operators"""
         hist = self.client.hub_history()
         even = hist[::2]
         odd = hist[1::2]
         recs = self.client.db_query({ 'msg_id' : {'$in' : even}})
         found = [ r['msg_id'] for r in recs ]
         self.assertEqual(set(even), set(found))
         recs = self.client.db_query({ 'msg_id' : {'$nin' : even}})
         found = [ r['msg_id'] for r in recs ]
         self.assertEqual(set(odd), set(found))
     
     def test_hub_history(self):
         hist = self.client.hub_history()
         recs = self.client.db_query({ 'msg_id' : {"$ne":''}})
         recdict = {}
         for rec in recs:
             recdict[rec['msg_id']] = rec
         
         latest = datetime(1984,1,1)
         for msg_id in hist:
             rec = recdict[msg_id]
             newt = rec['submitted']
             self.assertTrue(newt >= latest)
             latest = newt
         ar = self.client[-1].apply_async(lambda : 1)
         ar.get()
         time.sleep(0.25)
         self.assertEqual(self.client.hub_history()[-1:],ar.msg_ids)
     
     def _wait_for_idle(self):
         """wait for an engine to become idle, according to the Hub"""
         rc = self.client
         
+        # step 1. wait for all requests to be noticed
+        # timeout 5s, polling every 100ms
+        msg_ids = set(rc.history)
+        hub_hist = rc.hub_history()
+        for i in range(50):
+            if msg_ids.difference(hub_hist):
+                time.sleep(0.1)
+                hub_hist = rc.hub_history()
+            else:
+                break
+        
+        self.assertEqual(len(msg_ids.difference(hub_hist)), 0)
+        
+        # step 2. wait for all requests to be done
         # timeout 5s, polling every 100ms
         qs = rc.queue_status()
         for i in range(50):
             if qs['unassigned'] or any(qs[eid]['tasks'] for eid in rc.ids):
                 time.sleep(0.1)
                 qs = rc.queue_status()
             else:
                 break
         
         # ensure Hub up to date:
         self.assertEqual(qs['unassigned'], 0)
         for eid in rc.ids:
             self.assertEqual(qs[eid]['tasks'], 0)
     
     
     def test_resubmit(self):
         def f():
             import random
             return random.random()
         v = self.client.load_balanced_view()
         ar = v.apply_async(f)
         r1 = ar.get(1)
         # give the Hub a chance to notice:
         self._wait_for_idle()
         ahr = self.client.resubmit(ar.msg_ids)
         r2 = ahr.get(1)
         self.assertFalse(r1 == r2)
 
     def test_resubmit_chain(self):
         """resubmit resubmitted tasks"""
         v = self.client.load_balanced_view()
         ar = v.apply_async(lambda x: x, 'x'*1024)
         ar.get()
         self._wait_for_idle()
         ars = [ar]
         
         for i in range(10):
             ar = ars[-1]
             ar2 = self.client.resubmit(ar.msg_ids)
         
         [ ar.get() for ar in ars ]
 
     def test_resubmit_header(self):
         """resubmit shouldn't clobber the whole header"""
         def f():
             import random
             return random.random()
         v = self.client.load_balanced_view()
         v.retries = 1
         ar = v.apply_async(f)
         r1 = ar.get(1)
         # give the Hub a chance to notice:
         self._wait_for_idle()
         ahr = self.client.resubmit(ar.msg_ids)
         ahr.get(1)
         time.sleep(0.5)
         records = self.client.db_query({'msg_id': {'$in': ar.msg_ids + ahr.msg_ids}}, keys='header')
         h1,h2 = [ r['header'] for r in records ]
         for key in set(h1.keys()).union(set(h2.keys())):
             if key in ('msg_id', 'date'):
                 self.assertNotEqual(h1[key], h2[key])
             else:
                 self.assertEqual(h1[key], h2[key])
 
     def test_resubmit_aborted(self):
         def f():
             import random
             return random.random()
         v = self.client.load_balanced_view()
         # restrict to one engine, so we can put a sleep
         # ahead of the task, so it will get aborted
         eid = self.client.ids[-1]
         v.targets = [eid]
         sleep = v.apply_async(time.sleep, 0.5)
         ar = v.apply_async(f)
         ar.abort()
         self.assertRaises(error.TaskAborted, ar.get)
         # Give the Hub a chance to get up to date:
         self._wait_for_idle()
         ahr = self.client.resubmit(ar.msg_ids)
         r2 = ahr.get(1)
 
     def test_resubmit_inflight(self):
         """resubmit of inflight task"""
         v = self.client.load_balanced_view()
         ar = v.apply_async(time.sleep,1)
         # give the message a chance to arrive
         time.sleep(0.2)
         ahr = self.client.resubmit(ar.msg_ids)
         ar.get(2)
         ahr.get(2)
 
     def test_resubmit_badkey(self):
         """ensure KeyError on resubmit of nonexistant task"""
         self.assertRaisesRemote(KeyError, self.client.resubmit, ['invalid'])
 
     def test_purge_hub_results(self):
         # ensure there are some tasks
         for i in range(5):
             self.client[:].apply_sync(lambda : 1)
         # Wait for the Hub to realise the result is done:
         # This prevents a race condition, where we
         # might purge a result the Hub still thinks is pending.
-        time.sleep(0.1)
+        self._wait_for_idle()
         rc2 = clientmod.Client(profile='iptest')
         hist = self.client.hub_history()
         ahr = rc2.get_result([hist[-1]])
         ahr.wait(10)
         self.client.purge_hub_results(hist[-1])
         newhist = self.client.hub_history()
         self.assertEqual(len(newhist)+1,len(hist))
         rc2.spin()
         rc2.close()
 
     def test_purge_local_results(self):
         # ensure there are some tasks
         res = []
         for i in range(5):
             res.append(self.client[:].apply_async(lambda : 1))
-        time.sleep(0.1)
+        self._wait_for_idle()
         self.client.wait(10) # wait for the results to come back
         before = len(self.client.results)
         self.assertEqual(len(self.client.metadata),before)
         self.client.purge_local_results(res[-1])
         self.assertEqual(len(self.client.results),before-len(res[-1]), msg="Not removed from results")
         self.assertEqual(len(self.client.metadata),before-len(res[-1]), msg="Not removed from metadata")
         
     def test_purge_all_hub_results(self):
         self.client.purge_hub_results('all')
         hist = self.client.hub_history()
         self.assertEqual(len(hist), 0)
 
     def test_purge_all_local_results(self):
         self.client.purge_local_results('all')
         self.assertEqual(len(self.client.results), 0, msg="Results not empty")
         self.assertEqual(len(self.client.metadata), 0, msg="metadata not empty")
 
     def test_purge_all_results(self):
         # ensure there are some tasks
         for i in range(5):
             self.client[:].apply_sync(lambda : 1)
         self.client.wait(10)
+        self._wait_for_idle()
         self.client.purge_results('all')
         self.assertEqual(len(self.client.results), 0, msg="Results not empty")
         self.assertEqual(len(self.client.metadata), 0, msg="metadata not empty")
-        time.sleep(0.1)
-        hist = self.client.hub_history()#
+        hist = self.client.hub_history()
         self.assertEqual(len(hist), 0, msg="hub history not empty")
         
     def test_purge_everything(self):
         # ensure there are some tasks
         for i in range(5):
             self.client[:].apply_sync(lambda : 1)
         self.client.wait(10)
+        self._wait_for_idle()
         self.client.purge_everything()
         # The client results
         self.assertEqual(len(self.client.results), 0, msg="Results not empty")
         self.assertEqual(len(self.client.metadata), 0, msg="metadata not empty")
-        # the hub results
-        hist = self.client.hub_history()
-        self.assertEqual(len(hist), 0, msg="hub history not empty")
         # The client "bookkeeping"
         self.assertEqual(len(self.client.session.digest_history), 0, msg="session digest not empty")
         self.assertEqual(len(self.client.history), 0, msg="client history not empty")
+        # the hub results
+        hist = self.client.hub_history()
+        self.assertEqual(len(hist), 0, msg="hub history not empty")
         
     
     def test_spin_thread(self):
         self.client.spin_thread(0.01)
         ar = self.client[-1].apply_async(lambda : 1)
         time.sleep(0.1)
         self.assertTrue(ar.wall_time < 0.1,
             "spin should have kept wall_time < 0.1, but got %f" % ar.wall_time
         )
     
     def test_stop_spin_thread(self):
         self.client.spin_thread(0.01)
         self.client.stop_spin_thread()
         ar = self.client[-1].apply_async(lambda : 1)
         time.sleep(0.15)
         self.assertTrue(ar.wall_time > 0.1,
             "Shouldn't be spinning, but got wall_time=%f" % ar.wall_time
         )
     
     def test_activate(self):
         ip = get_ipython()
         magics = ip.magics_manager.magics
         self.assertTrue('px' in magics['line'])
         self.assertTrue('px' in magics['cell'])
         v0 = self.client.activate(-1, '0')
         self.assertTrue('px0' in magics['line'])
         self.assertTrue('px0' in magics['cell'])
         self.assertEqual(v0.targets, self.client.ids[-1])
         v0 = self.client.activate('all', 'all')
         self.assertTrue('pxall' in magics['line'])
         self.assertTrue('pxall' in magics['cell'])
         self.assertEqual(v0.targets, 'all')