Hi all,
We've recently run into some interesting behaviour that I thought I should bring
up to see if we want to do anything about it.
Basically the problem seems to be that nova-compute is doing disk I/O from the
main thread, and if it blocks then it can block all of nova-compute (since all
On 02/22/2016 10:43 AM, Chris Friesen wrote:
Hi all,
We've recently run into some interesting behaviour that I thought I
should bring up to see if we want to do anything about it.
Basically the problem seems to be that nova-compute is doing disk I/O
from the main thread, and if it blocks then i
On 02/22/2016 11:17 AM, Jay Pipes wrote:
On 02/22/2016 10:43 AM, Chris Friesen wrote:
Hi all,
We've recently run into some interesting behaviour that I thought I
should bring up to see if we want to do anything about it.
Basically the problem seems to be that nova-compute is doing disk I/O
fro
On 02/22/2016 10:43 AM, Chris Friesen wrote:
> Hi all,
>
> We've recently run into some interesting behaviour that I thought I
> should bring up to see if we want to do anything about it.
>
> Basically the problem seems to be that nova-compute is doing disk I/O
> from the main thread, and if it b
On 02/22/2016 11:30 AM, Chris Friesen wrote:
On 02/22/2016 11:17 AM, Jay Pipes wrote:
On 02/22/2016 10:43 AM, Chris Friesen wrote:
Hi all,
We've recently run into some interesting behaviour that I thought I
should bring up to see if we want to do anything about it.
Basically the problem see
On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
> On 02/22/2016 10:43 AM, Chris Friesen wrote:
> > Hi all,
> >
> > We've recently run into some interesting behaviour that I thought I
> > should bring up to see if we want to do anything about it.
> >
> > Basically the problem seems to
On Mon, Feb 22, 2016, at 12:15 PM, Mike Bayer wrote:
>
>
> On 02/22/2016 11:30 AM, Chris Friesen wrote:
> > On 02/22/2016 11:17 AM, Jay Pipes wrote:
> >> On 02/22/2016 10:43 AM, Chris Friesen wrote:
> >>> Hi all,
> >>>
> >>> We've recently run into some interesting behaviour that I thought I
>
On 02/22/2016 12:20 PM, Daniel P. Berrange wrote:
> On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
>> On 02/22/2016 10:43 AM, Chris Friesen wrote:
>>> Hi all,
>>>
>>> We've recently run into some interesting behaviour that I thought I
>>> should bring up to see if we want to do anythin
On 22 February 2016 at 17:38, Sean Dague wrote:
> On 02/22/2016 12:20 PM, Daniel P. Berrange wrote:
>> On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
>>> On 02/22/2016 10:43 AM, Chris Friesen wrote:
Hi all,
We've recently run into some interesting behaviour that I thoug
On 22/02/16 19:07, "John Garbutt" wrote:
>On 22 February 2016 at 17:38, Sean Dague wrote:
>> On 02/22/2016 12:20 PM, Daniel P. Berrange wrote:
>>> On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
On 02/22/2016 10:43 AM, Chris Friesen wrote:
> Hi all,
>
> We've recent
On 22/02/16 19:07, "John Garbutt" wrote:
>On 22 February 2016 at 17:38, Sean Dague wrote:
>> On 02/22/2016 12:20 PM, Daniel P. Berrange wrote:
>>> On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
On 02/22/2016 10:43 AM, Chris Friesen wrote:
> Hi all,
>
> We've rec
On 02/22/2016 11:20 AM, Daniel P. Berrange wrote:
On Mon, Feb 22, 2016 at 12:07:37PM -0500, Sean Dague wrote:
On 02/22/2016 10:43 AM, Chris Friesen wrote:
But the fact remains that nova-compute is doing disk I/O from the main
thread, and if the guests push that disk hard enough then nova-comp
For what it's worth Glance API also has to deal with file I/O blocking
all greenthreads and has CooperativeReaders/Writers that yield around
the file I/O to mitigate starvation. A while ago I hit an issue with
5 concurrent VM snapshots starving Nova compute eventlets due to the
excessive file IO o
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