org.neo4j.io.pagecache.monitoring

Interface PageCacheMonitor

All Known Subinterfaces:

PageCacheTracer

All Known Implementing Classes:

DefaultPageCacheTracer

public interface PageCacheMonitor

The PageCacheMonitor exposes internal counters from the page cache. The data for these counters is sourced through the PageCacheTracer API.

Method Summary

Methods

Modifier and Type	Method and Description
long	countBytesRead()
long	countBytesWritten()
long	countEvictionExceptions()
long	countEvictions()
long	countFaults()
long	countFilesMapped()
long	countFilesUnmapped()
long	countFlushes()
long	countPins()
long	countUnpins()

Method Detail

countFaults

long countFaults()

Returns:

The number of page faults observed thus far.

countEvictions

long countEvictions()

Returns:

The number of page evictions observed thus far.

countPins

long countPins()

Returns:

The number of page pins observed thus far.

countUnpins

long countUnpins()

Returns:

The number of page unpins observed thus far.

countFlushes

long countFlushes()

Returns:

The number of page flushes observed thus far.

countBytesRead

long countBytesRead()

Returns:

The sum total of bytes read in through page faults thus far.

countBytesWritten

long countBytesWritten()

Returns:

The sum total of bytes written through flushes thus far.

countFilesMapped

long countFilesMapped()

Returns:

The number of file mappings observed thus far.

countFilesUnmapped

long countFilesUnmapped()

Returns:

The number of file unmappings observed thus far.

countEvictionExceptions

long countEvictionExceptions()

Returns:

The number of page evictions that have thrown exceptions thus far.