Bug 143454

Description Peter Kim 2006-05-24 09:55:28 EDT

Hardware Environment:
CPU 2.8 Ghz
2GB RAM

Software Environment:
OS : Windows XP SP2
JRE : IBM JDK1.4.2

Build:

TPTP Build ID : TPTP-4.2.0-200605220100
jar file: fastxpath.jar
URL: http://download.torolab.ibm.com/cgi-bin/TPTP/4.2.0/generate-downloads.sh

LTA-JD Build : LTAJD-4.2.0-200605232327
jar file: fastxpath.jar,emffxp.jar
URL: http://download.torolab.ibm.com/cgi-bin/LTAJD/4.2.0/generate-downloads.sh

The fast xpath engine from TPTP-4.2.0-200605220100 process CBEs against XPath
filter three times slower compared to fast xpath engine from IIOSB-20050321-1(IBM)).


------- Additional Comment #1 From Ajay G. Rengasayee 2006-05-24 05:47 EST -------

Code to create an instance and use the FastXPathAPI from TPTP for XPath filter:

import java.io.File;

import org.eclipse.hyades.logging.events.cbe.CommonBaseEvent;
import org.eclipse.tptp.platform.provisional.fastxpath.FastXPathAPI;

public class FastXPathEngine implements XPathEngine {
	
    private static final String EXPRESSION_FILENAME = "expressions.fxp";
    FastXPathAPI api;

    public FastXPathEngine() throws InstantiationException {
        api = new FastXPathAPI(null);
        try {
            api.loadCompiledExpressions(new File(EXPRESSION_FILENAME));
        } catch (Exception e) {
        } 
    }

    public boolean matches(CommonBaseEvent cbe, String xpathExpr) {
        try {
            return api.match(cbe, xpathExpr);
        } catch (Exception e) {
            return false;
        }
    }
}
 --------------------------------------------------------------------------------

Code to create an instance and use the FastXPathAPI from IIOSB for XPath filter:
import java.io.File;

import org.eclipse.hyades.logging.events.cbe.CommonBaseEvent;
import com.ibm.xml.fastxpath.FastXPathAPI;

public class FastXPathEngine implements XPathEngine {
	
    private static final String EXPRESSION_FILENAME = "expressions.fxp";
    FastXPathAPI api;

    public FastXPathEngine() throws InstantiationException {
        api = new FastXPathAPI();
        try {
            api.loadCompiledExpressions(new File(EXPRESSION_FILENAME));
        } catch (Exception e) {
        } 
    }

    public boolean matches(CommonBaseEvent cbe, String xpathExpr) {
        try {
            return api.match(cbe, xpathExpr);
        } catch (Exception e) {
            return false;
        }
    }
}


------- Additional Comment #2 From Ajay G. Rengasayee 2006-05-24 07:23 EST -------

Created an attachment (id=1342)
Sample CBE log 

When this log is imported into LTAJD and highlighters(XPath filters) run on
them, 
it takes the time as folows:

1. 1733 microseconds with FastXPath from IIOSB
2. 2413 microseconds with FastXPath from TPTP.

The gap is much with Windows System events log. In that case, the gap is more
than 3 times.


------- Additional Comment #3 From Ajay G. Rengasayee 2006-05-24 07:24 EST -------

Created an attachment (id=1343)
XPath Filters