Report cache hit rates.

src/cpp/ripple/AcceptedLedger.h

@@ -70,6 +70,8 @@ public:
 	int getLedgerSeq() const		{ return mLedger->getLedgerSeq(); }
 	int getTxnCount() const			{ return mMap.size(); }
 
+	static float getCacheHitRate()	{ return ALCache.getHitRate(); }
+
 	ALTransaction::pointer getTxn(int) const;
 };
 

src/cpp/ripple/HashedObject.h

@@ -67,6 +67,8 @@ public:
 
 	bool isLevelDB()		{ return mLevelDB; }
 
+	float getCacheHitRate()	{ return mCache.getHitRate(); }
+
 	bool store(HashedObjectType type, uint32 index, const std::vector<unsigned char>& data,
 		const uint256& hash)
 	{

src/cpp/ripple/LedgerHistory.h

@@ -15,6 +15,7 @@ public:
 	void addLedger(Ledger::pointer ledger);
 	void addAcceptedLedger(Ledger::pointer ledger, bool fromConsensus);
 
+	float getCacheHitRate() { return mLedgersByHash.getHitRate(); }
 	uint256 getLedgerHash(uint32 index);
 	Ledger::pointer getLedgerBySeq(uint32 index);
 	Ledger::pointer getLedgerByHash(const uint256& hash);

src/cpp/ripple/LedgerMaster.h

@@ -158,7 +158,8 @@ public:
 	void resumeAcquiring();
 
 	void tune(int size, int age)	{ mLedgerHistory.tune(size, age); } 
-	void sweep(void) { mLedgerHistory.sweep(); }
+	void sweep()					{ mLedgerHistory.sweep(); }
+	float getCacheHitRate()			{ return mLedgerHistory.getCacheHitRate(); }
 
 	void addValidateCallback(callback& c) { mOnValidate.push_back(c); }
 

src/cpp/ripple/RPCHandler.cpp

@@ -2304,6 +2304,11 @@ Json::Value RPCHandler::doGetCounts(Json::Value jvRequest, int& cost, ScopedLock
 
 	ret["write_load"] = theApp->getHashedObjectStore().getWriteLoad();
 
+	ret["SLE_hit_rate"] = theApp->getSLECache().getHitRate();
+	ret["node_hit_rate"] = theApp->getHashedObjectStore().getCacheHitRate();
+	ret["ledger_hit_rate"] = theApp->getLedgerMaster().getCacheHitRate();
+	ret["AL_hit_rate"] = AcceptedLedger::getCacheHitRate();
+
 	std::string uptime;
 	int s = upTime();
 	textTime(uptime, s, "year", 365*24*60*60);