perfsonar development work

[Maciej Glowiak <>]

Hi guys,

This week I finished new way of accessing XML DB by Lookup Service. As 
you probably saw, I implemented it in two ways. One is using XQuery 
modifications (instead recent XUpdate), the second one using "Multiple 
files" where each Lookup Information is stored inside different XML file.

In the first option not only XUpdate were converted into XQuery 
Modifications but I moved a lot of code into XQuery expressions, so I 
optimized the way how it worked. Now more "logic" of LS was put into 
XQuery expressions what seems to be more efficient.

The second option wasn't fully implemented (I still need to work on LS 
Cleanup, but it won't be so time consuming I hope), but all basic 
functionality works fine. While registration Lookup Information goes to 
separate XML file inside Exist DB XML collection. Parameters are also 
stored separately. Because of some limitations of eXist DB XML or/and 
HTTP requests I needed to use MD5 encoding of file names, but it's an 
implementation detail and is transparent for user querying LS or service 
storing information (that's because XML file names should be in fact 
URLs and eXist DB XML doesn't support it through HTTP).

I also updated our benchmarking code a bit and re-run the procedure 
again, testing both options.

Results are in the attachments. All times are in seconds. Date used in 
both tests were exactly the same. Database was cleaned up and then they 
both with LS were restarted.

It seems the second option is much more efficient, but still needs some 
development (LSCleanup) and testing (which will be done in next weeks - 
the next week, when some of you are in Brazil, we have holidays in Poland).

I just wanted to give you some information for Salvador Meeting discussions.

Best regards

Maciej


--

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| Maciej Glowiak        Network Research and Development            ||
| 

     Poznan Supercomputing and Networking Center ||
| (+48 61) 858 2024          -- skype_id: maciej_psnc   GG: 4526858 ||
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Attachment: results-test1.pdf
Description: Adobe PDF document

Attachment: results-test1.xls
Description: application/msexcel