Re: [openstack-dev] [Nova] [Cyborg] why cyborg can not support an accelerators info list for more than one host?

2018-03-21 Thread 少合冯 
got it, thanks.


2018-03-22 0:50 GMT+08:00 Ed Leafe :

> On Mar 21, 2018, at 11:35 AM, 少合冯  wrote:
> >
> >> By default, hosts are weighed one by one. You can subclass the
> BaseWeigher (in nova/weights.py) to weigh all objects at once.
> >
> > Does that means it require call cyborg accelerator one by one?  the
> pseudo code as follow:
> > for host in hosts:
> >accelerator = cyborg.http_get_ accelerator(host)
> >do_weight_by_accelerator
> >
> > Instead of call cyborg accelerators once,  the pseudo code as follow :
> > accelerators = cyborg.http_get_ accelerator(hosts)
> > for acc in accelerators:
> >do_weight_by_accelerator
>
> What it means is that if you override the weigh_objects() method of the
> BaseWeigher class, you can make a single call to Cyborg with a list of all
> the hosts. That call could then create a list of weights for all the hosts
> and return that. So if you have 100 hosts, you don’t need to make 100 calls
> to Cyborg; only 1.
>
> -- Ed Leafe
>
>
>
>
>
>
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Re: [openstack-dev] [Nova] [Cyborg] why cyborg can not support an accelerators info list for more than one host?

2018-03-21 Thread Ed Leafe 
On Mar 21, 2018, at 11:35 AM, 少合冯  wrote:
> 
>> By default, hosts are weighed one by one. You can subclass the BaseWeigher 
>> (in nova/weights.py) to weigh all objects at once.
> 
> Does that means it require call cyborg accelerator one by one?  the pseudo 
> code as follow:
> for host in hosts:
>accelerator = cyborg.http_get_ accelerator(host)
>do_weight_by_accelerator
>
> Instead of call cyborg accelerators once,  the pseudo code as follow :
> accelerators = cyborg.http_get_ accelerator(hosts)
> for acc in accelerators:
>do_weight_by_accelerator

What it means is that if you override the weigh_objects() method of the 
BaseWeigher class, you can make a single call to Cyborg with a list of all the 
hosts. That call could then create a list of weights for all the hosts and 
return that. So if you have 100 hosts, you don’t need to make 100 calls to 
Cyborg; only 1.

-- Ed Leafe






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Re: [openstack-dev] [Nova] [Cyborg] why cyborg can not support an accelerators info list for more than one host?

2018-03-21 Thread 少合冯 
2018-03-22 0:11 GMT+08:00 Ed Leafe :

> On Mar 21, 2018, at 10:56 AM, 少合冯  wrote:
> >
> > Sorry, I did not attend the PTG.
> > Is it said there is a conclusion:
> > Scheduler weigher will call into Cyborg REST API for each host instead
> of one REST API for all hosts.
> > Is there some reason?
>
> By default, hosts are weighed one by one. You can subclass the BaseWeigher
> (in nova/weights.py) to weigh all objects at once.
>
>
Does that means it require call cyborg accelerator one by one?  the pseudo
code as follow:
for host in hosts:
   accelerator = cyborg.http_get_ accelerator(host)
   do_weight_by_accelerator

Instead of call cyborg accelerators once,  the pseudo code as follow :
accelerators = cyborg.http_get_ accelerator(hosts)
for acc in accelerators:
   do_weight_by_accelerator

-- Ed Leafe
>
>
>
>
>
>
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Re: [openstack-dev] [Nova] [Cyborg] why cyborg can not support an accelerators info list for more than one host?

2018-03-21 Thread Ed Leafe 
On Mar 21, 2018, at 10:56 AM, 少合冯  wrote:
> 
> Sorry, I did not attend the PTG. 
> Is it said there is a conclusion:
> Scheduler weigher will call into Cyborg REST API for each host instead of one 
> REST API for all hosts.  
> Is there some reason?

By default, hosts are weighed one by one. You can subclass the BaseWeigher (in 
nova/weights.py) to weigh all objects at once.

-- Ed Leafe






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[openstack-dev] [Nova] [Cyborg] why cyborg can not support an accelerators info list for more than one host?

2018-03-21 Thread 少合冯 
For today's IRC discussion.
There is question about the weigher.
Can cyborg support a get list API to get more than one host accelerators
info when weigher.

Sorry, I did not attend the PTG.
Is it said there is a conclusion:
Scheduler weigher will call into Cyborg REST API for each host instead of
one REST API for all hosts.
Is there some reason?



INFO:
http://eavesdrop.openstack.org/meetings/openstack_cyborg/2018/openstack_cyborg.2018-03-21-14.00.log.html


BR
Shaohe Feng
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