Re: [openstack-dev] [nova] Running large instances with CPU pinning and OOM

2017-09-28 Thread Premysl Kouril
> > Only the memory mapped for the guest is striclty allocated from the > NUMA node selected. The QEMU overhead should float on the host NUMA > nodes. So it seems that the "reserved_host_memory_mb" is enough. > Even if that would be true and overhead memory could float in NUMA nodes it generally

Re: [openstack-dev] [nova] Running large instances with CPU pinning and OOM

2017-09-27 Thread Premysl Kouril
> Lastly, qemu has overhead that varies depending on what you're doing in the > guest. In particular, there are various IO queues that can consume > significant amounts of memory. The company that I work for put in a good > bit of effort engineering things so that they work more reliably, and

Re: [openstack-dev] [Monasca] alarms based on events

2016-01-23 Thread Premysl Kouril
Hi Roland, > I don't think it would be difficult to add support for non-periodic > metrics/alarms. There are a couple of approaches we could take, so a design > discussion would be good to have if you are interested in implementing this. > This is feature that we are not working on right now,

Re: [openstack-dev] [Nova] sponsor some LVM development

2016-01-22 Thread Premysl Kouril
On 22 Jan 2016 17:43, "James Bottomley" < james.bottom...@hansenpartnership.com> wrote: > > On Fri, 2016-01-22 at 14:58 +0100, Premysl Kouril wrote: > > Hi Matt, James, > > > > any thoughts on the below notes? > > To be honest, not really. You've repe

Re: [openstack-dev] [Monasca] alarms based on events

2016-01-22 Thread Premysl Kouril
y, > this component could be added to the Agent. > > Using the Monasca Alarm API, an alarm could be defined, such as > max(snmp{}) > 0. > > The latency for a min/max alarm expression in Monasca is very low. > > Regards --Roland > > > On 1/18/16, 9:07 AM, "Pre

Re: [openstack-dev] [Nova] sponsor some LVM development

2016-01-22 Thread Premysl Kouril
Hi Matt, James, any thoughts on the below notes? Best Regards, Prema On 19 Jan 2016 20:47, "Premysl Kouril" <premysl.kou...@gmail.com> wrote: > Hi James, > > > > > > You still haven't answered Anita's question: when you say "sponsor" do > &

Re: [openstack-dev] [Nova] sponsor some LVM development

2016-01-19 Thread Premysl Kouril
> I'm not a Nova developer. I am interesting in clarifying what you are > asking. > > Are you asking for current Nova developers to work on this feature? Or > s your company interested in having your developers interact with Nova > developers? > > Thank you, > Anita. Both. We are first trying

Re: [openstack-dev] [Nova] sponsor some LVM development

2016-01-19 Thread Premysl Kouril
Hi James, > > You still haven't answered Anita's question: when you say "sponsor" do > you mean provide resources to existing developers to work on your > feature or provide new developers. > I did, I am copy-pasting my response to Anita here again: Both. We are first trying this "Are you

Re: [openstack-dev] [Nova] sponsor some LVM development

2016-01-19 Thread Premysl Kouril
Hi Matt, thanks for letting me know, we will definitely do reach you out if we start some activity in this area. To answer your question: main reason for LVM is simplicity and performance. It seems from our benchmarks that LVM behavior when processing many IOPs (10s of thousands) is more stable

[openstack-dev] [Monasca] alarms based on events

2016-01-18 Thread Premysl Kouril
Hello, we are just evaluating Monasca for our new cloud infrastructure and I would like to ask if there are any possibilities in current Monasca or some development plans to address following use case: We have a box which we need to monitor and when something goes wrong with the box, it sends

[openstack-dev] [Nova] sponsor some LVM development

2016-01-18 Thread Premysl Kouril
Hello everybody, we are a Europe based operator and we have a case for LVM based nova instances in our new cloud infrastructure. We are currently considering to contribute to OpenStack Nova to implement some features which are currently not supported for LVM based instances (they are only