JBoss Parent POM 1.7.0.Final · org.wildfly.common.cpu.ProcessorInfo

Field Summary

Modifier and Type	Field and Description
private static final Charset	ASCII
private static final byte[]	BITS
private static final String	CPUS_ALLOWED

Constructor Summary

Access	Constructor and Description
private	ProcessorInfo()

Method Summary

Modifier and Type	Method and Description
public static int	Returns: the available processors on this system. availableProcessors() Returns the number of processors available to this process.
private static int	determineProcessors()
private static boolean	isLinux()
private static int	readCPUMask()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

ASCII	back to summary
private static final Charset ASCII

BITS	back to summary
private static final byte[] BITS

CPUS_ALLOWED	back to summary
private static final String CPUS_ALLOWED

Constructor Detail

ProcessorInfo	back to summary
private ProcessorInfo()

Method Detail

availableProcessors back to summary

availableProcessors	back to summary
public static int availableProcessors() Returns the number of processors available to this process. On most operating systems this method simply delegates to `Runtime#availableProcessors()`. However, on Linux, this strategy is insufficient, since the JVM does not take into consideration the process' CPU set affinity which is employed by cgroups and numactl. Therefore this method will analyze the Linux proc filesystem to make the determination. Since the CPU affinity of a process can be change at any time, this method does not cache the result. Calls should be limited accordingly. Note tha on Linux, both SMT units (Hyper-Threading) and CPU cores are counted as a processor. Returns:int the available processors on this system.

public static int availableProcessors()

Returns the number of processors available to this process. On most operating systems this method simply delegates to Runtime#availableProcessors(). However, on Linux, this strategy is insufficient, since the JVM does not take into consideration the process' CPU set affinity which is employed by cgroups and numactl. Therefore this method will analyze the Linux proc filesystem to make the determination. Since the CPU affinity of a process can be change at any time, this method does not cache the result. Calls should be limited accordingly.
Note tha on Linux, both SMT units (Hyper-Threading) and CPU cores are counted as a processor.

Returns:int: the available processors on this system.

determineProcessors	back to summary
private static int determineProcessors()

isLinux	back to summary
private static boolean isLinux()

readCPUMask	back to summary
private static int readCPUMask() throws IOException