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[Sean Dague <sean@xxxxxxxxx>]

This looks like some sort of issues with AMQP connect to rabbit. As
that's all hidden behind olso.messaging, I think we should need to
figure out what's wrong there.

** Tags added: oslo

** Also affects: oslo.messaging
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1371084

Title:
  nova-scheduler high cpu usage

Status in OpenStack Compute (Nova):
  Incomplete
Status in Messaging API for OpenStack:
  New

Bug description:
  For no particular reason nova-scheduler cpu utilization can jump to
  100%. I was unable to find any pattern and reason why this is
  happening. We've small cluster 1 cloud controller and 7 node
  controllers. Except high cpu usage nothing bad happens, we're able to
  create/delete instances, after nova-scheduler restart everything goes
  back to normal state.

  I was able to strace 2 processes while nova-scheduler was using 100%
  cpu.

  1st process is in loop and it prints:
  <12>2014-09-16 00:02:21.501 5668 WARNING nova.openstack.common.loopingcall [-] task run outlasted interval by 12.322771 sec\0"

  2nd processes is in loop as well and it's repeating:
  epoll_ctl(6, EPOLL_CTL_ADD, 3, {EPOLLOUT|EPOLLERR|EPOLLHUP, {u32=3, u64=40095890530107395}}) = 0
  epoll_wait(6, {{EPOLLOUT, {u32=3, u64=40095890530107395}}}, 1023, 878) = 1
  epoll_ctl(6, EPOLL_CTL_DEL, 3, {EPOLLRDNORM|EPOLLRDBAND|EPOLLWRNORM|EPOLLMSG|EPOLLHUP|0x2485d020, {u32=32708, u64=23083065509183428}}) = 0
  sendto(3, "<14>2014-09-16 00:44:19.272 5673 INFO oslo.messaging._drivers.impl_rabbit [-] Connecting to AMQP server on 10.3.128.254:5672\0", 125, 0, NULL, 0) = -1 ENOTCONN (Transport endpoint is not connected)

  Other processes doesn't have any issues with AMQP server just only
  nova-scheduler.

  We're using Debian, kernel 3.14-1-amd64, nova-scheduler 2014.1.2-1.

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