Package com.oracle.truffle.api.dsl

Class SpecializationStatistics

java.lang.Object

com.oracle.truffle.api.dsl.SpecializationStatistics

public final class SpecializationStatistics
extends Object

Represents a specialization statistics utiltiy that can be entered to collect additional statistics about Truffle DSL nodes. In order for the statistics to be useful the nodes need to be regenerated using the -Atruffle.dsl.GenerateSpecializationStatistics=true flag or using the SpecializationStatistics.AlwaysEnabled annotation.

The easiest way to use this utility is to enable the --engine.SpecializationStatistics polyglot option. This should print the histogram when the engine is closed.

See also the usage tutorial on the website.

Since:

20.3

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static @interface	SpecializationStatistics.AlwaysEnabled	Used on nodes to always enable specialization statistics.
static class	SpecializationStatistics.NodeStatistics	Class to collect statistics information per node.

Method Summary

Modifier and Type	Method	Description
static SpecializationStatistics	create()	Creates a new specialization statistics instance.
SpecializationStatistics	enter()	Enters this specialization instance object on the current thread.
boolean	hasData()	Returns true if the statistics did collect any data, else false.
void	leave(SpecializationStatistics prev)	Leaves the currently entered entered statistics.
void	printHistogram(PrintStream stream)	Prints the specialization histogram to the provided stream.
void	printHistogram(PrintWriter writer)	Prints the specialization histogram to the provided writer.

Methods inherited from class java.lang.Object

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

Method Details

hasData

public boolean hasData()

Returns true if the statistics did collect any data, else false.

Since:

20.3

printHistogram

public void printHistogram(PrintWriter writer)

Prints the specialization histogram to the provided writer. Does not print anything if no data was collected.

Since:

20.3

See Also:

• printHistogram(PrintWriter)

printHistogram

public void printHistogram(PrintStream stream)

Prints the specialization histogram to the provided stream. Does not print anything if no data was collected.

Since:

20.3

See Also:

• printHistogram(PrintWriter)

create

public static SpecializationStatistics create()

Creates a new specialization statistics instance. Note specialization statistics need to be entered to collect data on a thread.

Since:

20.3

enter

public SpecializationStatistics enter()

Enters this specialization instance object on the current thread. After entering a specialization statistics instance will gather statistics for all nodes with specializations that were created on this entered thread. Multiple threads may be entered at the same time. The caller must make sure to leave(SpecializationStatistics) the current statistics after entering in all cases.

Since:

20.3

leave

public void leave(SpecializationStatistics prev)

Leaves the currently entered entered statistics. It is required to leave a statistics block after it was entered. It is recommended to use a finally block for this purpose.

Since:

20.3