Top Description Inners Fields Constructors Methods
io.smallrye.common.cpu

public final Class CacheInfo

extends Object
Class Inheritance
Annotations
@SuppressWarnings:removal
Imports
java.io.File, .FileInputStream, .IOException, .InputStream, .InputStreamReader, .Reader, java.nio.charset.StandardCharsets, java.security.AccessController, .PrivilegedAction, java.util.ArrayList, .Locale
A class which exposes any available cache line information for the current CPU.

Nested and Inner Type Summary

Modifier and TypeClass and Description
pack-priv static class
CacheInfo.StreamConsumer

Field Summary

Modifier and TypeField and Description
private static final CacheLevelInfo[]
cacheLevels

Constructor Summary

AccessConstructor and Description
private
CacheInfo()

Method Summary

Modifier and TypeMethod and Description
private static boolean
determineCacheLevel()

public static CacheLevelInfo

Returns:

the CPU cache level information
getCacheLevelInfo(int
the cache level index
index)

Get the CPU cache level information for a cache level.

public static int

Returns:

the number of CPU cache levels, or 0 if unknown
getLevelEntryCount()

Get the number of CPU cache level entries.

public static int

Returns:

the smallest cache line size, or 0 if unknown
getSmallestDataCacheLineSize()

Get the smallest known data cache line size.

public static int

Returns:

the smallest cache line size, or 0 if unknown
getSmallestInstructionCacheLineSize()

Get the smallest known instruction cache line size.

public static void
main(String[]
ignored
args)

A simple main method which prints cache info when called.

pack-priv static int
parseIntFile(final File file)

pack-priv static int
parseIntKBFile(final File file)

pack-priv static String
parseProcessOutput(final String... args)

pack-priv static String
parseStringFile(final File file)

pack-priv static String
parseStringStream(final InputStream is)

pack-priv static int
safeParseInt(final String string)

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

cacheLevelsback to summary
private static final CacheLevelInfo[] cacheLevels

Constructor Detail

CacheInfoback to summary
private CacheInfo()

Method Detail

determineCacheLevelback to summary
private static boolean determineCacheLevel()
getCacheLevelInfoback to summary
public static CacheLevelInfo getCacheLevelInfo(int index)

Get the CPU cache level information for a cache level. The index argument must be greater than zero and less than the number of levels returned by getLevelEntryCount().

Parameters
index:int

the cache level index

Returns:CacheLevelInfo

the CPU cache level information

getLevelEntryCountback to summary
public static int getLevelEntryCount()

Get the number of CPU cache level entries. If no cache information could be gathered, 0 is returned.

Returns:int

the number of CPU cache levels, or 0 if unknown

getSmallestDataCacheLineSizeback to summary
public static int getSmallestDataCacheLineSize()

Get the smallest known data cache line size. If no cache line sizes are known, 0 is returned. Note that smaller cache lines may exist if one or more cache line sizes are unknown.

Returns:int

the smallest cache line size, or 0 if unknown

getSmallestInstructionCacheLineSizeback to summary
public static int getSmallestInstructionCacheLineSize()

Get the smallest known instruction cache line size. If no cache line sizes are known, 0 is returned. Note that smaller cache lines may exist if one or more cache line sizes are unknown.

Returns:int

the smallest cache line size, or 0 if unknown

mainback to summary
public static void main(String[] args)

A simple main method which prints cache info when called.

Parameters
args:String[]

ignored

parseIntFileback to summary
pack-priv static int parseIntFile(final File file)
parseIntKBFileback to summary
pack-priv static int parseIntKBFile(final File file)
parseProcessOutputback to summary
pack-priv static String parseProcessOutput(final String... args)
parseStringFileback to summary
pack-priv static String parseStringFile(final File file)
parseStringStreamback to summary
pack-priv static String parseStringStream(final InputStream is)
safeParseIntback to summary
pack-priv static int safeParseInt(final String string)
io.smallrye.common.cpu back to summary

pack-priv Class CacheInfo.StreamConsumer

extends Object
implements Runnable
Class Inheritance
All Implemented Interfaces
java.lang.Runnable

Field Summary

Modifier and TypeField and Description
private final InputStream
stream

Constructor Summary

AccessConstructor and Description
pack-priv
StreamConsumer(final InputStream stream)

Method Summary

Modifier and TypeMethod and Description
public void
run()

Implements java.lang.Runnable.run.

Runs this operation.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

streamback to summary
private final InputStream stream

Constructor Detail

StreamConsumerback to summary
pack-priv StreamConsumer(final InputStream stream)

Method Detail

runback to summary
public void run()

Implements java.lang.Runnable.run.

Doc from java.lang.Runnable.run.

Runs this operation.