Packages

class CpuSampler extends Runnable

A lightweight CPU profiler based on call stack sampling.

When run as a thread, it periodically captures the call stacks of all live threads and maintains counters for each leaf method. The counters are then dumped to a logger with a given periodicity (most probably greater than the sampling period). Each data row written to the logger contains a timestamp, the method profiled, its location in the source code and the associated absolute counters and relative weight.

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Instance Constructors

  1. new CpuSampler(samplePeriod: Long = 100, flushPeriod: Long = 10000, logger: Logger = ...)

    samplePeriod

    the period between each sample taken

    flushPeriod

    the period between each flush to log

    logger

    the logger to which results are written

Value Members

  1. final def !=(arg0: Any): Boolean
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  8. def finalize(): Unit
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  9. def flush(timestamp: Long = System.currentTimeMillis()): Unit

    Flushes the stored profiling data to the logger.

    Flushes the stored profiling data to the logger.

    timestamp

    the timestamp to use when writing the entries to the logger

  10. final def getClass(): Class[_]
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  11. def hashCode(): Int
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  12. final def isInstanceOf[T0]: Boolean
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  13. final def ne(arg0: AnyRef): Boolean
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  14. final def notify(): Unit
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  15. final def notifyAll(): Unit
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  16. def run(): Unit
    Definition Classes
    CpuSampler → Runnable
  17. def sample(): Unit

    Captures the current call stacks of all live threads and stores relevant profiling data about them.

  18. def shouldProfile(elem: StackTraceElement): Boolean

    Returns a boolean value indicating if the stack trace element should be considered when profiling or not.

    Returns a boolean value indicating if the stack trace element should be considered when profiling or not.

    elem

    the stack trace element

    returns

    true if the stack trace element should be considered in profiling, false otherwise.

  19. def stop(): Unit

    Stops the data collecting and flushes the remaining data to the logger, causing the thread to stop eventually.

  20. final def synchronized[T0](arg0: ⇒ T0): T0
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  21. def toString(): String
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  22. final def wait(): Unit
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  23. final def wait(arg0: Long, arg1: Int): Unit
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  24. final def wait(arg0: Long): Unit
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