Statistics (Jikes RVM API)

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org.jikesrvm.mm.mmtk
Class Statistics

java.lang.Object
  org.mmtk.vm.Statistics
      org.jikesrvm.mm.mmtk.Statistics

All Implemented Interfaces:: Constants

public final class Statistics
extends Statistics
implements Constants
extends Statistics
implements Constants

Field Summary
`private PerfEvent[]`	`perfEvents`

Fields inherited from interface org.mmtk.utility.Constants
ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING

Fields inherited from interface org.mmtk.utility.Constants

ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING

Constructor Summary
`Statistics()`

Method Summary
`long`	`cycles()` Read a cycle counter (high resolution, non-monotonic clock).
`long`	`millisToNanos(double t)` Convert milliseconds to nanoseconds
`double`	`nanosToMillis(long c)` Convert nanoseconds to milliseconds
`double`	`nanosToSecs(long c)` Convert nanoseconds to seconds
`long`	`nanoTime()` Read nanoTime (high resolution, monotonically increasing clock).
`void`	`perfEventInit(String events)` Initialize performance events
`void`	`perfEventRead(int id, long[] values)` Read a performance event
`long`	`secsToNanos(double t)` Convert seconds to nanoseconds

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

perfEvents

private PerfEvent[] perfEvents

Constructor Detail

Statistics

public Statistics()

Method Detail

nanoTime

public long nanoTime()

Read nanoTime (high resolution, monotonically increasing clock). Has same semantics as java.lang.System.nanoTime().

Specified by:: nanoTime in class Statistics

cycles

public long cycles()

Read a cycle counter (high resolution, non-monotonic clock). This method should be used with care as the cycle counters (especially on IA32 SMP machines) are not a reliably time source.

Specified by:: cycles in class Statistics