I have implemented a new monitor based on the system load averages
https://review.openstack.org/#/c/74014/1
What do you think?
s.
----- Original Message -----
From: "sahid" <[email protected]>
To: "OpenStack Development Mailing List (not for usage questions)"
<[email protected]>
Sent: Monday, February 17, 2014 10:32:19 AM
Subject: Re: [openstack-dev] [Nova] bp proposal: filter based on the load
averages of the host
yes I want to use the load average because it is based on more information than
the cpu utilization. May be instead of to add a new field to hypervisor status
I can create a new monitor or update the exiting one.
----- Original Message -----
From: "yunhong jiang" <[email protected]>
To: "OpenStack Development Mailing List (not for usage questions)"
<[email protected]>
Sent: Saturday, February 15, 2014 12:54:52 AM
Subject: Re: [openstack-dev] [Nova] bp proposal: filter based on the load
averages of the host
On Fri, 2014-02-14 at 15:29 +0000, sahid wrote:
> Greetings,
>
> I would like to add a new filter based on the load averages.
>
> This filter will use the command uptime and will provides an option to choice
> a
> period between 1, 5, and 15 minutes and an option to choice the max load
> average (a float between 0 and 1).
>
> Why:
> During a scheduling it could be useful to exclude a host that have a too
> heavy load and the command uptime (available in all linux system)
> can return a load average of the system in different periods.
>
> About the implementation:
> Currently 'all' drivers (libvirt, xenapi, vmware) supports a method
> get_host_uptime that returns the output of the command 'uptime'. We have to
> add
> in compute/stats.py a new method calculate_loadavg() that returns based on the
> output of driver.get_host_uptime() from compute/ressource_tracker.py a well
> formatted tuple of load averages for each periods. We also need to update
> api/openstack/compute/contrib/hypervisors.py to take care of this new
> field.
>
> The implementation will be divided in several parts:
> * Add to host_manager the possibility to get the loads_averages
> * Implement the filter based on this new property
> * Implement the filter with a per-aggregate configuration
>
> The blueprint: https://blueprints.launchpad.net/nova/+spec/filter-based-uptime
>
> I will be happy to get any comments about this filter, perharps it is not
> implemented
> yet because of something I didn't see or my thinking of the implementation is
> wrong.
>
> PS: I have checked metrics and cpu_resource but It does not get an averages
> of the
> system load or perhaps I have not understand all.
>
> Thanks a lot,
> s.
>
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I think load average has more than CPU, you need consider like I/O
usage, or even other metrics. Maybe you can have a look at the
https://blueprints.launchpad.net/nova/+spec/utilization-aware-scheduling ?
Also IMHO the policy of "exclude a host that have a too heavy load" is
not so clean, would it be better to keep the usage as a scheduler
weight?
Thanks
--jyh
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