com.sun.squawk
Class GarbageCollector

java.lang.Object
  com.sun.squawk.GarbageCollector

Direct Known Subclasses:

Lisp2GenerationalCollector

public abstract class GarbageCollector
extends Object

Base class for all garbage collectors.

Field Summary

static boolean

NATIVE_GC_ONLY If build.properties defines NATIVE_GC_ONLY= true, then define constant NATIVE_GC_ONLY = true.

Method Summary

int	getBytesAllocatedSinceLastGC() Get the number of bytes allocated since the last GC.
long	getBytesAllocatedTotal() Get the number of bytes allocated since JVM startup.
long	getBytesFreedTotal() Get the number of bytes freed in all collections
long	getBytesLastFreed() Get the number of bytes freed in the last collection
long	getBytesLastScanned() Get the number of bytes scanned in the last collection.
long	getLastGCTime() Gets the time taken by the last collection.
long	getMaxFullGCTime() Gets the time of the longest full GC.
long	getMaxGCTime() Get the time taken by the slowest garbage collection.
long	getMaxPartialGCTime() Gets the time of the longest partial GC.
long	getTotalFullGCTime() Gets the time taken by all full garbage collections.
long	getTotalGCTime() Gets the time taken by all GC.
long	getTotalPartialGCTime() Get the time taken by all partial garbage collections.

Methods inherited from class java.lang.Object

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

Field Detail

NATIVE_GC_ONLY

public static final boolean NATIVE_GC_ONLY

If build.properties defines NATIVE_GC_ONLY= true, then define constant NATIVE_GC_ONLY = true.

See Also:

Constant Field Values

Method Detail

getBytesAllocatedSinceLastGC

public int getBytesAllocatedSinceLastGC()

Get the number of bytes allocated since the last GC. May be inaccurate during a copyObjectGraph operation.

Returns:

bytes

getBytesAllocatedTotal

public long getBytesAllocatedTotal()

Get the number of bytes allocated since JVM startup. Watch out for overflow.

Returns:

bytes

getBytesFreedTotal

public final long getBytesFreedTotal()

Get the number of bytes freed in all collections

Returns:

bytes

getBytesLastFreed

public final long getBytesLastFreed()

Get the number of bytes freed in the last collection

Returns:

bytes

getBytesLastScanned

public final long getBytesLastScanned()

Get the number of bytes scanned in the last collection. This is a measure of how much "work" the collector did in the last GC. It measures the size of the heap that was last collected. With generational colelctors this may be much less than the size of the used heap. It can also be used to compute "bytes surviving collection" = getBytesLastScanned() - getBytesLastFreed().

Returns:

the number of bytes scanned in the last collection.

getLastGCTime

public final long getLastGCTime()

Gets the time taken by the last collection.

Returns:

ms

getMaxFullGCTime

public final long getMaxFullGCTime()

Gets the time of the longest full GC.

Returns:

ms

getMaxGCTime

public final long getMaxGCTime()

Get the time taken by the slowest garbage collection.

Returns:

ms

getMaxPartialGCTime

public final long getMaxPartialGCTime()

Gets the time of the longest partial GC.

Returns:

ms

getTotalFullGCTime

public final long getTotalFullGCTime()

Gets the time taken by all full garbage collections.

Returns:

ms

getTotalGCTime

public final long getTotalGCTime()

Gets the time taken by all GC.

Returns:

ms

getTotalPartialGCTime

public final long getTotalPartialGCTime()

Get the time taken by all partial garbage collections.

Returns:

ms