perfsonar development work

[Jason Zurawski <>]

Chris;

> Personally I currently don't see the "retrieve all" to make any sense, as 
> it does not seem to work properly anyway.
> If it takes more than a minute to get the results, what's the point?
> I even tried to use the perfsonarUI to do an retrieve all from the GEANT 
> MA, which does not have that many interfaces, and it just locks up after a 
> while, without any results.
> Does that function work for anyone that is running a production MA?
>   


I have found that it works most of the time if I set the heap value
pretty high, and don't background pS-UI to do any other work (neglecting
either of these two items freezes pS-UI or my laptop).  I have seen good
behavior on a fairly large MA (Internet2's, ~500 interfaces), and it
does much better on smaller ones.  Something huge like ESnet is a non
starter currently. 

I would naively suggest that this switch in retrieval would improve
performance as much as possible currently, until some other data-based
optimization could be found to reduce the memory/cpu requirements.


-jason


>>>> I think the "retrieve all" is a good thing to have, but particularly
>>>> when testing large deployments (ESnet has 1000s of interfaces for
>>>> example) it would be good to have functionality to do the metadata
>>>> request to populate pS-UI, then selectively retrieve interface info for
>>>> data requests instead of automatically getting everythihng.  Working on
>>>> a Mac mini at SC, it was impossible to run pS-UI due to the volume of
>>>> data generated by certain services (also caused repeated Heap 
>>>> Overflows).  
>>>>         
>>> I agree for testing purposes it will be convenient to send obnly
>>> metadata request.  I am thinking of two options
>>> 1) add a new menu item (in addition to retrieve all) with
>>> functionality to send only metadata request , therefore the table will
>>> be filled in only with interface metadata and no utilization
>>> statistics, and no data will be displayed at barchart /radar chart. In
>>> this case, could you suggest an appropriate title for the new menu item?
>>> or
>>> 2)add an option somewhere in order to switch the behaviour of
>>> "Retrieve All" between current behaviour and sending only metadata
>>> request.
>>>
>>> Which will be the preferred way?
>>>       
>> Option 1 makes the most sense to me, I would call this choice "Populate"
>> or something similar.  After this step there would need to be two
>> options for data retrieval: the current "retrieve all", then the ability
>> to select interfaces from the table, and simply "retrieve selected". 
>>
>> Anyone else feel strongly one way or another about this?
>>
>> -jason
>>
>>
>>     
>
>   


-- 

Jason Zurawski, Network Software Engineer
Internet2

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