org.apache.drill.test.rowSet.test

Class PerformanceTool

java.lang.Object

org.apache.drill.test.rowSet.test.PerformanceTool

public class PerformanceTool
extends Object

Tests the performance of the writers compared to using the value vector mutators directly. In order to achieve apples-to-apples comparison, the tests work directly with individual columns in the writer case; the row writer level is omitted as the row writer simulates the reader logic previously used to write to vectors.

Current results:

• Required and nullable writers are slightly faster than the corresponding vector mutator methods.
• Writer is 230% faster than a repeated mutator.

The key reason for the converged performance (now compared to earlier results below) is that both paths now use bounds-checking optimizations.

Prior results before the common bounds-check optimizations:

• Writer is 42% faster than a required mutator.
• Writer is 73% faster than a nullable mutator.
• Writer is 407% faster than a repeated mutator.

Since performance is critical for this component (this is the ultimate "inner loop", please run these tests periodically to ensure that performance does not drop; it is very easy to add a bit of code here or there that greatly impacts performance.

This is not a JUnit test. Rather, it is a stand-alone program which must be run explicitly. One handy way is to run it from your IDE. If using Eclipse, monitor the system to wait for Eclipse to finish its background processing before launching.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PerformanceTool.ArrayWriterTester
static class	PerformanceTool.NullableVectorTester
static class	PerformanceTool.NullableWriterTester
static class	PerformanceTool.PerfTester
static class	PerformanceTool.RepeatedVectorTester
static class	PerformanceTool.RequiredVectorTester
static class	PerformanceTool.RequiredWriterTester

Field Summary

Fields

Modifier and Type	Field and Description
static int	ITERATIONS
static int	ROW_COUNT

Constructor Summary

Constructors

Constructor and Description
PerformanceTool()

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Field Detail

ROW_COUNT

public static final int ROW_COUNT

See Also:

Constant Field Values

ITERATIONS

public static final int ITERATIONS

See Also:

Constant Field Values

Constructor Detail

PerformanceTool

public PerformanceTool()

Method Detail

main

public static void main(String[] args)