com.saxonica.ee.bytecode

Class ByteCodeMonitor

java.lang.Object

com.saxonica.ee.bytecode.ByteCodeMonitor

public class ByteCodeMonitor
extends java.lang.Object

Class to accumulate statistics on the effectiveness of byte code generation. Enabled by setting the configuration property Feature.MONITOR_HOT_SPOT_BYTE_CODE

Field Summary

Fields

Modifier and Type	Field and Description
IntHashMap<com.saxonica.ee.bytecode.ByteCodeMonitor.ByteCodeDetails>	stats

Constructor Summary

Constructors

Constructor and Description
ByteCodeMonitor()

Method Summary

Modifier and Type	Method and Description
void	logCompilation(ByteCodeCandidate candidate, long time)
void	logExecution(ByteCodeCandidate candidate, java.lang.String evalMode, long time)
void	report(java.io.PrintWriter w) Generate an XML report of the collected statistics.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

stats

public IntHashMap<com.saxonica.ee.bytecode.ByteCodeMonitor.ByteCodeDetails> stats

Constructor Detail

ByteCodeMonitor

public ByteCodeMonitor()

Method Detail

logCompilation

public void logCompilation(ByteCodeCandidate candidate,
                           long time)

logExecution

public void logExecution(ByteCodeCandidate candidate,
                         java.lang.String evalMode,
                         long time)

report

public void report(java.io.PrintWriter w)

Generate an XML report of the collected statistics.

The following attributes are output for each candidate expression. Timings are in microseconds:

• text Abbreviated text of the expression
• intCout Number of times the expression was evaluated in the interpreter
• intTime Cumulative time spent evaluating the expression (including subexpressions) in the interpreter
• bcCount Number of times the expression was evaluated as byte-code
• bcTime Cumulative time spent evaluating the expression (including subexpressions) as byte-code
• compileTime Time spent generating bytecode for the expression
• ratio Average byte-code execution time as a proportion of average interpreted execution time
• ebv Number of evaluations of the expressions effectiveBooleanValue() method
• eval Number of evaluations of the expressions evaluateItem() method
• iterate Number of evaluations of the expressions iterate() method
• process Number of evaluations of the expressions process() method
• module URI of the module containing the expression
• line Line number of the expression within this module

Parameters:

w - the destination to which the generated XML will be written