Hi, After a few tempest run I noticed slowdowns in the nova-api-os-compute uwsgi processes. I check the processes with py-spy and found that a lot of process blocked on read(). Here is my py-spy output from one of my nova-api-os-compute uwsgi process: http://paste.openstack.org/show/731677/
And the stack trace: thread_id = Thread-2 filename = /usr/lib/python2.7/threading.py lineno = 774 function = __bootstrap line = self.__bootstrap_inner() thread_id = Thread-2 filename = /usr/lib/python2.7/threading.py lineno = 801 function = __bootstrap_inner line = self.run() thread_id = Thread-2 filename = /usr/lib/python2.7/threading.py lineno = 754 function = run line = self.__target(*self.__args, **self.__kwargs) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py lineno = 382 function = poll line = self.conn.consume(timeout=current_timeout) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py lineno = 1083 function = consume line = error_callback=_error_callback) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py lineno = 807 function = ensure line = ret, channel = autoretry_method() thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/kombu/connection.py lineno = 494 function = _ensured line = return fun(*args, **kwargs) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/kombu/connection.py lineno = 570 function = __call__ line = return fun(*args, channel=channels[0], **kwargs), channels[0] thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py lineno = 796 function = execute_method line = method() thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py lineno = 1068 function = _consume line = self.connection.drain_events(timeout=poll_timeout) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/kombu/connection.py lineno = 301 function = drain_events line = return self.transport.drain_events(self.connection, **kwargs) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/kombu/transport/pyamqp.py lineno = 103 function = drain_events line = return connection.drain_events(**kwargs) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/amqp/connection.py lineno = 471 function = drain_events line = while not self.blocking_read(timeout): thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/amqp/connection.py lineno = 476 function = blocking_read line = frame = self.transport.read_frame() thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/amqp/transport.py lineno = 226 function = read_frame line = frame_header = read(7, True) thread_id = Thread-2 filename = /openstack/venvs/nova-17.0.4/lib/python2.7/site-packages/amqp/transport.py lineno = 346 function = _read line = s = recv(n - len(rbuf)) # see note above thread_id = Thread-2 filename = /usr/lib/python2.7/ssl.py lineno = 643 function = read line = v = self._sslobj.read(len) I am using nova 17.0.4.dev1, amqp (2.2.2), oslo.messaging (5.35.0), kombu (4.1.0). I have 3 controller nodes. The openstack deployed by OSA 17.0.4. I can reproduce the read() block if I click on "Log" in Horizon to see the console outputs from one of my VM or run a tempest test: tempest.api.compute.admin.test_hypervisor.HypervisorAdminTestJSON.test_get_hypervisor_uptime. The nova-api response time increasing when more and more nova-api processes get blocked at this read. Is it a normal behavior? --- Regards, Robert Varjasi consultant@Component Soft Ltd. _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
