[Users] oVirt-sdk to fetch individual cpu stats

[Michael Pasternak]

On 09/10/2013 02:04 PM, Deepthi Dharwar wrote:
> Thanks a lot Micheal. Works like a charm :)
> 
> How does one know that you need to access first field in
> statistic.get_values().get_value()[0].datum.
> Are these documented any place ?

you can see this in api [1] there is a collection of values
represented by <value> place-hoder, you can find discussion
on statistics api modelling at the old rhevm-api [2] mailing list.

<values type="...">
  <value>
    <datum>...</datum>
  </value>
</values>

[1] GET http://server:[port]/api/hosts/xxx/statistics
[2] https://lists.fedorahosted.org/pipermail/rhevm-api/

> 
> Regards,
> Deepthi
> 
> On 09/08/2013 03:55 PM, Michael Pasternak wrote:
> 
> 
>>
>> Hi Deepthi,
>>
>> On 09/06/2013 01:12 PM, Deepthi Dharwar wrote:
>>> Hi,
>>>
>>> I was trying to get the cpu statistics of a host using the oVirt python
>>> sdk. But beyond a point I am unable to deference to the actual cpu stats
>>> field and the data.
>>>
>>> h_list = api.hosts.list()
>>> for h in h_list:	
>>> 	y = h.statistics.list()
>>> 	for i in y:
>>> 	    print i.get_values()
>>>
>>> O/P:
>>>
>>>  <ovirtsdk.xml.params.Values object at 0x22cbd90>
>>>  <ovirtsdk.xml.params.Values object at 0x22cbb90>
>>>  <ovirtsdk.xml.params.Values object at 0x22cba90>
>>>  <ovirtsdk.xml.params.Values object at 0x22cba10>
>>>  <ovirtsdk.xml.params.Values object at 0x22cbf10>
>>>
>>> Can some one please let me know how I can get individual fields like
>>> cpu.current.system or cpu.current.idle stats from here.
>>
>> you can use sdk client side filtering on collections using
>> map based constraints [1], just note that you cannot use
>> same constrain (name) twice [2] as following entry will always
>> override the former one,
>>
>> to work this out, just use your private inline filtering [3] (it will have
>> same complexity as using sdk filtering)
>>
>> [1]
>>
>>     for h in h_list:
>>         statistics = h.statistics.list(**{
>>                             'name':'cpu.current.system'
>>                             }
>>         )
>>         for statistic in statistics:
>>             print "%s=%0.4f %s" % (
>>                                 statistic.get_name(),
>>                                 statistic.get_values().get_value()[0].datum,
>>                                 statistics[0].get_unit()
>>             )
>>
>> [2]
>>
>>         statistics = h.statistics.list(**{
>>                             'name':'cpu.current.system',
>>                             'name':'cpu.current.idle'
>>                             }
>>         )
>>
>>
>> [3]
>>
>>     h_list = api.hosts.list()
>>     stats_to_show = ['cpu.current.system', 'cpu.current.idle']
>>     for h in h_list:
>>         statistics = h.statistics.list()
>>         for statistic in statistics:
>>             if statistic.get_name() in stats_to_show:
>>                 print "%s=%0.4f %s" % (
>>                                     statistic.get_name(),
>>                                     statistic.get_values().get_value()[0].datum ,
>>                                     statistics[0].get_unit()
>>                 )
>>
>>
>>
>> hope it helps.
>>
>>>
>>> Thanks!
>>> Deepthi
>>>
>>
>>
> 


-- 

Michael Pasternak
RedHat, ENG-Virtualization R&D