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[Ritesh <rsritesh@xxxxxxxxxx>]

Public bug reported:

Description
===========

CPU pinning fails when the sibling set consists of single VCPUS and a sibling set. 
For example, 

CoercedSet([45]), CoercedSet([31]), CoercedSet([1, 25])

Considering a case, 
When  a compute with NUMA NODE 1 which has 4 VCPU and 16GB RAM available to use. 

And when you to try to launch a instance with a flavor of 4 VCPU and
16GB RAM, it is failed to launch i.e "message": "No valid host was
found. There are not enough hosts available."

Total Available VCPUS 
1,3,5,7,9,11,13,15,17,19,21,25,27,29,31,33,35,37,39,41,43,45 
Used VCPUS 
3,5,7,9,11,13,15,17,19,21,27,29,33,35,37,39,41,43 
Free VCPUS
1,25,31,45


VCPUS STATISTICS 
Total : 22
Usage : 18
Free  : 4

siblings=set([21,45]),set([7,31]),set([15,39]),set([11,35]),set([17,41]),set([3,27]),set([13,37]),set([9,33]),set([19,43]),set([5,29]),set([1,25])])

1, 25 , 31 and 45 VCPUS are available to use but nova could not able to
use them.

As 31 and 45 are not siblings , Nova is not considering them to boot the VM.
Because of Numa Topology Filter returns with 0 hosts available.   

Steps to reproduce
==================

We have 22 VCPUS available for Pinning in NUMA NODE 1.

1. Launch an instance with 1 VCPU
2. Launch an instance with 1 VCPU
3. Launch an instance with 8 VCPU
4. Launch an instance with 8 VCPU 
5. Launch an instance with 8 VCPU


Expected result
===============

Instance should be in active state

Actual result
=============

Instance is in Error state. 
| fault                                | {"message": "No valid host was found. There are not enough hosts available.", "code": 500, "details": "  File \"/usr/lib/python2.7/dist-packages/nova/conductor/manager.py\", line 397, in build_instances |


Environment
===========
1. Exact version of OpenStack you are running. 

   Mitaka Stable
  
2. Which hypervisor did you use?
   Libvirt + KVM

2. Which storage type did you use?
   None

3. Which networking type did you use?
   Neutron with OpenVSwitch

** Affects: nova
     Importance: Low
     Assignee: Ritesh (rsritesh)
         Status: New

-- 
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https://bugs.launchpad.net/bugs/1657791

Title:
  cpu pining fails with 1 sibling cpu set and 2 single cpu set

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  CPU pinning fails when the sibling set consists of single VCPUS and a sibling set. 
  For example, 

  CoercedSet([45]), CoercedSet([31]), CoercedSet([1, 25])

  Considering a case, 
  When  a compute with NUMA NODE 1 which has 4 VCPU and 16GB RAM available to use. 

  And when you to try to launch a instance with a flavor of 4 VCPU and
  16GB RAM, it is failed to launch i.e "message": "No valid host was
  found. There are not enough hosts available."

  Total Available VCPUS 
  1,3,5,7,9,11,13,15,17,19,21,25,27,29,31,33,35,37,39,41,43,45 
  Used VCPUS 
  3,5,7,9,11,13,15,17,19,21,27,29,33,35,37,39,41,43 
  Free VCPUS
  1,25,31,45

  
  VCPUS STATISTICS 
  Total : 22
  Usage : 18
  Free  : 4

  siblings=set([21,45]),set([7,31]),set([15,39]),set([11,35]),set([17,41]),set([3,27]),set([13,37]),set([9,33]),set([19,43]),set([5,29]),set([1,25])])

  1, 25 , 31 and 45 VCPUS are available to use but nova could not able
  to use them.

  As 31 and 45 are not siblings , Nova is not considering them to boot the VM.
  Because of Numa Topology Filter returns with 0 hosts available.   

  Steps to reproduce
  ==================

  We have 22 VCPUS available for Pinning in NUMA NODE 1.

  1. Launch an instance with 1 VCPU
  2. Launch an instance with 1 VCPU
  3. Launch an instance with 8 VCPU
  4. Launch an instance with 8 VCPU 
  5. Launch an instance with 8 VCPU

  
  Expected result
  ===============

  Instance should be in active state

  Actual result
  =============

  Instance is in Error state. 
  | fault                                | {"message": "No valid host was found. There are not enough hosts available.", "code": 500, "details": "  File \"/usr/lib/python2.7/dist-packages/nova/conductor/manager.py\", line 397, in build_instances |

  
  Environment
  ===========
  1. Exact version of OpenStack you are running. 

     Mitaka Stable
    
  2. Which hypervisor did you use?
     Libvirt + KVM

  2. Which storage type did you use?
     None

  3. Which networking type did you use?
     Neutron with OpenVSwitch

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