de.lmu.ifi.dbs.elki.persistent

Interface PageFileStatistics

All Known Subinterfaces:

PageFile<P>

All Known Implementing Classes:

AbstractPageFile, AbstractStoringPageFile, LRUCache, MemoryPageFile, OnDiskArrayPageFile, PersistentPageFile

public interface PageFileStatistics

Statistics API for a Page File. See PageFileUtil for related utility functions for analysing this data!

Method Summary

Methods

Modifier and Type	Method and Description
PageFileStatistics	getInnerStatistics() Get statistics for the inner page file, if present.
long	getReadOperations() Returns the read I/O-Accesses of this file.
long	getWriteOperations() Returns the write I/O-Accesses of this file.
void	resetPageAccess() Resets the counters for page accesses of this file and flushes the cache.

Method Detail

getReadOperations

long getReadOperations()

Returns the read I/O-Accesses of this file.

Returns:

Number of physical read I/O accesses

getWriteOperations

long getWriteOperations()

Returns the write I/O-Accesses of this file.

Returns:

Number of physical write I/O accesses

resetPageAccess

void resetPageAccess()

Resets the counters for page accesses of this file and flushes the cache.

getInnerStatistics

PageFileStatistics getInnerStatistics()

Get statistics for the inner page file, if present.

Returns:

Inner page file statistics, or null.