Copyright © 2011 Open Geospatial Consortium
30 collecting can be tricky many runs are necessary if you want to get a fair figure.
Garbage collecting is called before the run, so only the “top-up” value can be a minor figure is GC was called during the run. As GC takes some CPU to run, this
comment also works for CPU consumption.
The memory consumption is based on the sum of all banks of heap memory, so no BSS or TXT data is taken into consideration in these memory measures.
5.3 Candidates
This chapter focused on describing the different candidates used in the benchmark and theirs various configurations.
5.3.1 Java based
5.3.1.1 Java Sax parser
This is a SAX parser providing a SAX parser and reader, doing no compression by its own.
5.3.1.1.1 Without compression XMLNeither
With no specific option, this candidate will handle SAX events provided by the platform a SAX parser, same for all candidates, then regenerate XML.
This particular configuration serves as a reference for other candidates as it will generate “no compression” on any file, so it will stand for the 100 mark. Generally it’s the worst
candidate regarding “compaction” but the best for “CPU” in “encode”.
This configuration is in: exi-ttfmsconfigdriverssaxxml-neither.xml
… param name=japex.driverClass
value=org.w3c.exi.ttf.candidate.xml.jaxp.JAXPSAXDriver param name=org.w3c.exi.ttf.driver.candidateName value=XML
param name=org.w3c.exi.ttf.driver.isXmlProcessor value=true driver name=XMLNeither normal=true
param name=description value=XML param name=org.w3c.exi.ttf.applicationClass
value=neither driver
…
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31
5.3.1.1.2 With GZIP default compression XMLDocument
Same as XMLNeither except a gzip compressor is connected between the output of the SAX reader and the output stream or datasink. This could be seen as a basic GZIP on
the raw XML file, except SAX is used.
This configuration is in: exi-ttfmsconfigdriverssaxxml-document.xml
… param name=japex.driverClass
value=org.w3c.exi.ttf.candidate.xml.jaxp.JAXPSAXDriver param name=org.w3c.exi.ttf.driver.candidateName value=XML
param name=org.w3c.exi.ttf.driver.isXmlProcessor value=true driver name=XMLDocument normal=true
param name=description value=XML using document analysis param name=org.w3c.exi.ttf.applicationClass
value=document param
name=org.w3c.exi.ttf.applicationClass.documentAnalysing.GZIP value=true
driver …
5.3.1.1.3 With GZIP compression for a given compression level 1-9
As we modified the platform to be able to integrate a new parameter org.w3c.exi.ttf.applicationClass.documentAnalysing.level to set the level for gzip
compression default is 4 between 1 and 9, you can use it on the XML candidate also.
… param name=japex.driverClass
value=org.w3c.exi.ttf.candidate.xml.jaxp.JAXPSAXDriver param name=org.w3c.exi.ttf.driver.candidateName value=XML
param name=org.w3c.exi.ttf.driver.isXmlProcessor value=true driver name=XMLDocument normal=true
param name=description value=XML using document analysis level 9
param name=org.w3c.exi.ttf.applicationClass value=document
param name=org.w3c.exi.ttf.applicationClass.documentAnalysing.GZIP
value=true param
name=org.w3c.exi.ttf.applicationClass.documentAnalysing.level value=9
driver …
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32 We didn’t want to disable gzip by just using a level 4 compression performance, so we
choose to use 9 maximum for all XML Document tests.
5.3.1.1.4 With GZIP compression, level and pre-loaded dictionnary
