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This example measures the performance of XML parsing in the C++/Parser
mapping. It also shows how to structure your code to achieve the maximum
performance for this operation.
The example consists of the following files:
test.xsd
XML Schema which describes the test vocabulary.
test-50k.xml
Test XML document.
gen.cxx
Program to generate a test document of desired size.
To compile and link this program we can use the following commands (replace
'c++' with your C++ compiler name):
c++ -c gen.cxx
c++ -o gen gen.o
To generate the test document execute, for example:
./gen 633 test-100k.xml
time.hxx
time.cxx
Class definition that represents time.
test-pskel.hxx
test-pskel.ixx
test-pskel.cxx
Parser skeletons generated by the XSD compiler from test.xsd using the
following command line:
xsd cxx-parser --skel-file-suffix=-xerces-pskel test.xsd
Or if using Expat instead of Xerces-C++ as the underlying XML parser:
xsd cxx-parser --xml-parser=expat --skel-file-suffix=-expat-pskel test.xsd
driver.cxx
Driver for the example. It first parses the command line arguments
and reads the entire document into a memory buffer. It then creates
a SAX parser and pre-parses and caches the schema if validation is
enabled (Xerces-C++ only). Finally, it runs the performance
measurement loop which on each iteration parses the XML document
from the in-memory buffer.
To compile and link the example manually from the command line we can use
the following commands (replace 'c++' with your C++ compiler name):
c++ -c test-xerces-pskel.cxx
c++ -c time.cxx
c++ -DXERCES_PARSER -c driver.cxx
c++ -o driver driver.o time.o test-xerces-pskel.o -lxerces-c
Or if using Expat as the underlying XML parser:
c++ -c test-expat-pskel.cxx
c++ -c time.cxx
c++ -c driver.cxx
c++ -o driver driver.o time.o test-expat-pskel.o -lexpat
To run the example on a test XML document execute:
./driver test-50k.xml
The -v option can be used to turn on validation in the underlying XML
parser (only makes sense for Xerces-C++, off by default). The -i option
can be used to specify the number of parsing iterations (1000 by default).
For example:
./driver -v -i 100 test-50k.xml
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