Hi,
A colleague was doing some performance testing and discovered some
contention at this line of my code:
XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
...which was surprising : ) He informed me it was doing a blocking
operation every time.
Anyway, he went away and went through the Xerces source and found that
if the "org.apache.xerces.xni.parser.XMLParserConfiguration" system
property is not set it does indeed do a blocking operation (in
parsers.ObjectFactory)
To demonstrate this, run the below code with and without the system
property set:
public static void main(String... args) throws Exception {
//System.setProperty("org.apache.xerces.xni.parser.XMLParserConfiguration",
// "org.apache.xerces.parsers.XIncludeParserConfiguration");
long start = System.nanoTime();
for (int i = 0; i <= 10000; i++) {
XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
}
long end = System.nanoTime();
double millis = (end - start) * 1e-6;
System.out.println(millis);
}
On my machine it consistently takes around ~2000ms without the system
property, and ~1300ms with.
This is present in both 2.9 and 2.11 as far as I can see.
--
Andrew Welch
http://andrewjwelch.com
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