Public bug reported:
I recently ran into an issue where I was trying to boot an instance with
8 vCPUs, with hw:cpu_policy=dedicated. The host had 8 pCPUs available,
but they were a mix of siblings and non-siblings.
In virt.hardware._pack_instance_onto_cores(), the _get_pinning()
function seems to be the culprit. It was called with the following
inputs:
(Pdb) threads_no
1
(Pdb) sibling_set
[CoercedSet([63]), CoercedSet([49]), CoercedSet([48]), CoercedSet([50]),
CoercedSet([59, 15]), CoercedSet([18, 62])]
(Pdb) instance_cell.cpuset
CoercedSet([0, 1, 2, 3, 4, 5, 6, 7])
As we can see, we are looking for 8 vCPUs, and there are 8 pCPUs
available. However, when we call _get_pinning() it doesn't give us a
mapping:
> /usr/lib/python2.7/site-packages/nova/virt/hardware.py(899)_pack_instance_onto_cores()
-> pinning = _get_pinning(threads_no, sibling_set,
(Pdb) n
> /usr/lib/python2.7/site-packages/nova/virt/hardware.py(900)_pack_instance_onto_cores()
-> instance_cell.cpuset)
(Pdb) n
> /usr/lib/python2.7/site-packages/nova/virt/hardware.py(901)_pack_instance_onto_cores()
-> if pinning:
(Pdb) pinning
This is a bug, if we haven't specified anything regarding hyperthreading then
we should be able to run with a mix of siblings and non-siblings.
** Affects: nova
Importance: Undecided
Status: New
** Tags: compute numa scheduler
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https://bugs.launchpad.net/bugs/1602814
Title:
hyperthreading bug in NUMATopologyFilter
Status in OpenStack Compute (nova):
New
Bug description:
I recently ran into an issue where I was trying to boot an instance
with 8 vCPUs, with hw:cpu_policy=dedicated. The host had 8 pCPUs
available, but they were a mix of siblings and non-siblings.
In virt.hardware._pack_instance_onto_cores(), the _get_pinning()
function seems to be the culprit. It was called with the following
inputs:
(Pdb) threads_no
1
(Pdb) sibling_set
[CoercedSet([63]), CoercedSet([49]), CoercedSet([48]), CoercedSet([50]),
CoercedSet([59, 15]), CoercedSet([18, 62])]
(Pdb) instance_cell.cpuset
CoercedSet([0, 1, 2, 3, 4, 5, 6, 7])
As we can see, we are looking for 8 vCPUs, and there are 8 pCPUs
available. However, when we call _get_pinning() it doesn't give us a
mapping:
>
/usr/lib/python2.7/site-packages/nova/virt/hardware.py(899)_pack_instance_onto_cores()
-> pinning = _get_pinning(threads_no, sibling_set,
(Pdb) n
>
/usr/lib/python2.7/site-packages/nova/virt/hardware.py(900)_pack_instance_onto_cores()
-> instance_cell.cpuset)
(Pdb) n
>
/usr/lib/python2.7/site-packages/nova/virt/hardware.py(901)_pack_instance_onto_cores()
-> if pinning:
(Pdb) pinning
This is a bug, if we haven't specified anything regarding hyperthreading then
we should be able to run with a mix of siblings and non-siblings.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1602814/+subscriptions
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