com.facebook.buck.event.listener.stats.cache

Class CacheRateStatsKeeper

java.lang.Object

com.facebook.buck.event.listener.stats.cache.CacheRateStatsKeeper

public class CacheRateStatsKeeper
extends Object

Measure CACHE HIT % based on total cache misses and the theoretical total number of build rules. REASON: If we only look at cache_misses and processed rules we are strongly biasing the result toward misses. Basically misses weight more than hits. One MISS will traverse all its dependency subtree potentially generating misses for all internal Nodes; worst case generating N cache_misses. One HIT will prevent any further traversal of dependency sub-tree nodes so it will only count as one cache_hit even though it saved us from fetching N nodes.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CacheRateStatsKeeper.CacheRateStatsUpdateEvent

Constructor Summary

Constructors

Constructor and Description
CacheRateStatsKeeper()

Method Summary

Modifier and Type	Method and Description
void	buildRuleFinished(BuildRuleEvent.Finished finished)
static CacheRateStatsKeeper.CacheRateStatsUpdateEvent	getAggregatedCacheRateStats(com.google.common.collect.ImmutableCollection<CacheRateStatsKeeper.CacheRateStatsUpdateEvent> statsEvents)
AtomicInteger	getRuleCount()
CacheRateStatsKeeper.CacheRateStatsUpdateEvent	getStats()
void	ruleCountCalculated(BuildEvent.RuleCountCalculated calculated)
void	ruleCountUpdated(BuildEvent.UnskippedRuleCountUpdated updated)

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheRateStatsKeeper

public CacheRateStatsKeeper()

Method Detail

buildRuleFinished

public void buildRuleFinished(BuildRuleEvent.Finished finished)

ruleCountCalculated

public void ruleCountCalculated(BuildEvent.RuleCountCalculated calculated)

ruleCountUpdated

public void ruleCountUpdated(BuildEvent.UnskippedRuleCountUpdated updated)

getAggregatedCacheRateStats

public static CacheRateStatsKeeper.CacheRateStatsUpdateEvent getAggregatedCacheRateStats(com.google.common.collect.ImmutableCollection<CacheRateStatsKeeper.CacheRateStatsUpdateEvent> statsEvents)

getStats

public CacheRateStatsKeeper.CacheRateStatsUpdateEvent getStats()

getRuleCount

public AtomicInteger getRuleCount()