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

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.