Run QPS workers just for the scenario that we want, to avoid interference

tools/run_tests/run_performance_tests.py

@@ -63,14 +63,19 @@ class QpsWorkerJob:
     self._spec = spec
     self.language = language
     self.host_and_port = host_and_port
+    self._job = None
+
+  def start(self):
     self._job = jobset.Job(spec, newline_on_success=True, travis=True, add_env={})
 
   def is_running(self):
     """Polls a job and returns True if given job is still running."""
-    return self._job.state() == jobset._RUNNING
+    return self._job and self._job.state() == jobset._RUNNING
 
   def kill(self):
-    return self._job.kill()
+    if self._job:
+      self._job.kill()
+      self._job = None
 
 
 def create_qpsworker_job(language, shortname=None,
@@ -253,8 +258,8 @@ def build_on_remote_hosts(hosts, languages=scenario_config.LANGUAGES.keys(), bui
     sys.exit(1)
 
 
-def start_qpsworkers(languages, worker_hosts):
-  """Starts QPS workers as background jobs."""
+def create_qpsworkers(languages, worker_hosts):
+  """Creates QPS workers (but does not start them)."""
   if not worker_hosts:
     # run two workers locally (for each language)
     workers=[(None, 10000), (None, 10010)]
@@ -274,6 +279,9 @@ def start_qpsworkers(languages, worker_hosts):
           for worker_idx, worker in enumerate(workers)]
 
 
+Scenario = collections.namedtuple('Scenario', 'jobspec workers')
+
+
 def create_scenarios(languages, workers_by_lang, remote_host=None, regex='.*',
                      category='all', bq_result_table=None,
                      netperf=False, netperf_hosts=[]):
@@ -282,6 +290,7 @@ def create_scenarios(languages, workers_by_lang, remote_host=None, regex='.*',
                  for workers in workers_by_lang.values()
                  for worker in workers]
   scenarios = []
+  _NO_WORKERS = []
 
   if netperf:
     if not netperf_hosts:
@@ -293,16 +302,18 @@ def create_scenarios(languages, workers_by_lang, remote_host=None, regex='.*',
     else:
       netperf_server=netperf_hosts[0]
       netperf_client=netperf_hosts[1]
-    scenarios.append(create_netperf_jobspec(server_host=netperf_server,
-                                            client_host=netperf_client,
-                                            bq_result_table=bq_result_table))
+    scenarios.append(Scenario(
+        create_netperf_jobspec(server_host=netperf_server,
+                               client_host=netperf_client,
+                               bq_result_table=bq_result_table),
+        _NO_WORKERS))
 
   for language in languages:
     for scenario_json in language.scenarios():
       if re.search(args.regex, scenario_json['name']):
         categories = scenario_json.get('CATEGORIES', [])
         if category in categories or (category == 'all' and categories != ['sweep']):
-          workers = workers_by_lang[str(language)]
+          workers = workers_by_lang[str(language)][:]
           # 'SERVER_LANGUAGE' is an indicator for this script to pick
           # a server in different language.
           custom_server_lang = scenario_json.get('SERVER_LANGUAGE', None)
@@ -330,14 +341,14 @@ def create_scenarios(languages, workers_by_lang, remote_host=None, regex='.*',
               # replace all client workers by workers of a different language,
               # leave num_server workers as they are server workers.
               workers[idx] = workers_by_lang[custom_client_lang][idx]
-          scenario = create_scenario_jobspec(scenario_json,
-                                             workers,
-                                             remote_host=remote_host,
-                                             bq_result_table=bq_result_table)
+          scenario = Scenario(
+              create_scenario_jobspec(scenario_json,
+                                      [w.host_and_port for w in workers],
+                                      remote_host=remote_host,
+                                      bq_result_table=bq_result_table),
+              workers)
           scenarios.append(scenario)
 
-  # the very last scenario requests shutting down the workers.
-  scenarios.append(create_quit_jobspec(all_workers, remote_host=remote_host))
   return scenarios
 
 
@@ -411,42 +422,31 @@ if not args.remote_driver_host:
   build_local = True
 build_on_remote_hosts(remote_hosts, languages=[str(l) for l in languages], build_local=build_local)
 
-qpsworker_jobs = start_qpsworkers(languages, args.remote_worker_host)
-
-# TODO(jtattermusch): see https://github.com/grpc/grpc/issues/6174
-time.sleep(5)
+qpsworker_jobs = create_qpsworkers(languages, args.remote_worker_host)
 
 # get list of worker addresses for each language.
-worker_addresses = dict([(str(language), []) for language in languages])
+workers_by_lang = dict([(str(language), []) for language in languages])
 for job in qpsworker_jobs:
-  worker_addresses[str(job.language)].append(job.host_and_port)
-
-try:
-  scenarios = create_scenarios(languages,
-                               workers_by_lang=worker_addresses,
-                               remote_host=args.remote_driver_host,
-                               regex=args.regex,
-                               category=args.category,
-                               bq_result_table=args.bq_result_table,
-                               netperf=args.netperf,
-                               netperf_hosts=args.remote_worker_host)
-
-  if not scenarios:
-    raise Exception('No scenarios to run')
-
-  jobset.message('START', 'Running scenarios.', do_newline=True)
-  num_failures, _ = jobset.run(
-      scenarios, newline_on_success=True, maxjobs=1)
-  if num_failures == 0:
-    jobset.message('SUCCESS',
-                   'All scenarios finished successfully.',
-                   do_newline=True)
-  else:
-    jobset.message('FAILED', 'Some of the scenarios failed.',
-                   do_newline=True)
-    sys.exit(1)
-except:
-  traceback.print_exc()
-  raise
-finally:
-  finish_qps_workers(qpsworker_jobs)
+  workers_by_lang[str(job.language)].append(job)
+
+scenarios = create_scenarios(languages,
+                           workers_by_lang=worker_addresses,
+                           remote_host=args.remote_driver_host,
+                           regex=args.regex,
+                           category=args.category,
+                           bq_result_table=args.bq_result_table,
+                           netperf=args.netperf,
+                           netperf_hosts=args.remote_worker_host)
+
+if not scenarios:
+  raise Exception('No scenarios to run')
+
+for scenario in scenarios:
+  try:
+    for worker in scenario.workers:
+      worker.start()
+    jobset.run([scenario.jobspec,
+                create_quit_jobspec(scenario.workers, remote_host=remote_host)],
+               newline_on_success=True, maxjobs=1)
+  finally:
+    finish_qps_workers(scenario.workers)