On 05/05/2014 04:19 PM, Jiang, Yunhong wrote:
-----Original Message-----
From: Jay Pipes [mailto:jaypi...@gmail.com]
Sent: Monday, May 05, 2014 9:50 AM
To: openstack-dev@lists.openstack.org
Subject: Re: [openstack-dev] [nova] Question about addit log in
nova-compute.log
On 05/04/2014 11:09 PM, Chen CH Ji wrote:
Hi
I saw in my compute.log has following logs which looks
to me strange at first, Free resource is negative make me confused and I
take a look at the existing code
looks to me the logic is correct and calculation doesn't
have problem ,but the output 'Free' is confusing
Is this on purpose or might need to be enhanced?
2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker
[-]
Free ram (MB): -1559
2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker
[-]
Free disk (GB): 29
2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker
[-]
Free VCPUS: -3
Hi Kevin,
I think changing "free" to "available" might make things a little more
clear. In the above case, it may be that your compute worker has both
CPU and RAM overcommit enabled.
Best,
-jay
HI, Jay,
I don't think change 'free' to 'available' will make it clearer.
IMHO, the calculation of the 'free' is bogus. When report the status in
the periodic task, the resource tracker has no idea of the over-commit ration
at all, thus it simply subtract the total RAM number assigned to instances from
the RAM number provided by hypervisor w/o considering the over-commitment at
all. So this number really have meaningless.
Agreed that in it's current state, it's meaningless. But... that said,
the numbers *could* be used to show oversubscription percentage, and you
don't need to know the max overcommit ratio in order to calculate that
with the numbers already known.
Best,
-jay
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