perfsonar development work

["Vedrin Jeliazkov" <>]

Hi,

I've run some simple tests against the upgraded RRD MA at ESnet in an attempt
to compare its performance against the older release. Here are the timings
I've got:

1. One MetadataKeyRequest (summary) [sec]       
2. Number of Interfaces (NoI)   
3. (NoI x 2) SetupDataRequests (detailed summary) [sec]
4. Average SetupDataRequest [msec]
5. Average Link latency (RTT) [msec]
6. Implementation
        
                (1)     (2)     (3)     (4)     (5)     (6)     
        
ESNET           180     415      468     564    202     Java 0.1 (EGEE tag)
ESNET           296     419     1600    1909    206     perfSONAR-1.0

As you can see, the differences in the number of interfaces and the network
latency are insignificant, while MetadataKeyRequest's and SetupDataREquest's
processing time is much longer in the new service version, when compared to
the older one (multiplied by 1.6 and 3.4 respectively).

If the service is running on the same hardware platform, than we could
conclude that there is a significant performance loss in the new version,
which is most probably due to some newly introduced scalability issue. Perhaps
some more comprehensive tests should be run in order to understand and resolve
this issue.

Kind regards,
Vedrin
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