org.neo4j.io.pagecache.monitoring

Interface PageCacheCounters

All Known Subinterfaces:

PageCacheTracer

All Known Implementing Classes:

DefaultPageCacheTracer

public interface PageCacheCounters

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

Method Summary

Modifier and Type	Method and Description
long	bytesRead()
long	bytesWritten()
long	evictionExceptions()
long	evictions()
long	faults()
long	filesMapped()
long	filesUnmapped()
long	flushes()
long	pins()
long	unpins()

Method Detail

faults

long faults()

Returns:

The number of page faults observed thus far.

evictions

long evictions()

Returns:

The number of page evictions observed thus far.

pins

long pins()

Returns:

The number of page pins observed thus far.

unpins

long unpins()

Returns:

The number of page unpins observed thus far.

flushes

long flushes()

Returns:

The number of page flushes observed thus far.

bytesRead

long bytesRead()

Returns:

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

bytesWritten

long bytesWritten()

Returns:

The sum total of bytes written through flushes thus far.

filesMapped

long filesMapped()

Returns:

The number of file mappings observed thus far.

filesUnmapped

long filesUnmapped()

Returns:

The number of file unmappings observed thus far.

evictionExceptions

long evictionExceptions()

Returns:

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