Some performance results for xml\Test

[Valeriy Podkolzin <vp...@atg.com>]

I checked the performance of xml\Test sample and got some questionable
results with SQL data store:

1. For provided Domain.xml and Import.xml retrieving-traversing node
operation:

            for (int i=0; i<nbcheck; i++) {
                structure.retrieve(slideToken, "/toto/2/3/4/5");
            }

gave about 17,000 ops./sec. ( all nodes preset and stored in caches).

2. Changing node uri from /toto/... to /foo/...  ( creating and retrieving
new nodes inside Test instead predefined in Import.xml) gave about 1,700
ops./sec., 10 times less. Looks like Slide imposes caching only on node
uri(s) predefined in .xml .

            try {
                structure.retrieve(slideToken, "/foo");
            } catch (StructureException e) {
                System.out.println
                    ("!!!!Objects don't exist : Creating objects ...");
                subject1 = (SubjectNode) structure.retrieve(slideToken,
"/");
                structure.create(slideToken, subject2, "/foo");
                structure.create(slideToken, subject3, "/foo/1.txt");
........

            for (int i=0; i<nbcheck; i++) {
                structure.retrieve(slideToken, "/foo/2/3/4/5");
            }

3. Changing node uri from /toto/... to /toto/foo/... ( like put additional
collection) gave 15,000 ops./sec.

            try {
                structure.retrieve(slideToken, "/toto/foo");
            } catch (StructureException e) {
                System.out.println
                    ("!!!!Objects don't exist : Creating objects ...");
                subject1 = (SubjectNode) structure.retrieve(slideToken,
"/");
                structure.create(slideToken, subject2, "/toto/foo");
                structure.create(slideToken, subject3, "/toto/foo/1.txt");
........

            for (int i=0; i<nbcheck; i++) {
                structure.retrieve(slideToken, "/toto/foo/2/3/4/5");
            }
I didn't find the cause, but a wierd thing that in any case I saw that Slide
put a node uri ...foo... into cache in HashMapObjectCache.put(key, value)
and get the object for the key ...foo... from there for all samples.

Valeriy Podkolzin