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Track TaggedCache hit rates.

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This commit is contained in:
JoelKatz
2013-05-21 16:10:23 -07:00
parent 23eafaab85
commit 51ec5787d5
1 changed files with 28 additions and 3 deletions
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31
src/cpp/ripple/TaggedCache.h
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@@ -63,16 +63,21 @@ protected:
cache_type mCache; // Hold strong reference to recent objects
int mLastSweep;
uint64 mHits, mMisses;
public:
TaggedCache(const char *name, int size, int age)
: mName(name), mTargetSize(size), mTargetAge(age), mCacheCount(0), mLastSweep(upTime()) { ; }
: mName(name), mTargetSize(size), mTargetAge(age), mCacheCount(0), mLastSweep(upTime()),
mHits(0), mMisses(0)
{ ; }
int getTargetSize() const;
int getTargetAge() const;
int getCacheSize();
int getTrackSize();
int getSweepAge();
float getHitRate();
void clearStats();
void setTargetSize(int size);
void setTargetAge(int age);
@@ -129,6 +134,19 @@ template<typename c_Key, typename c_Data> int TaggedCache<c_Key, c_Data>::getTra
return mCache.size();
}
template<typename c_Key, typename c_Data> float TaggedCache<c_Key, c_Data>::getHitRate()
{
boost::recursive_mutex::scoped_lock sl(mLock);
return (static_cast<float>(mHits) * 100) / (1.0 + mHits + mMisses);
}
template<typename c_Key, typename c_Data> float TaggedCache<c_Key, c_Data>::clearStats()
{
boost::recursive_mutex::scoped_lock sl(mLock);
mHits = 0;
mMisses = 0;
}
template<typename c_Key, typename c_Data> void TaggedCache<c_Key, c_Data>::clear()
{
boost::recursive_mutex::scoped_lock sl(mLock);
@@ -302,20 +320,27 @@ boost::shared_ptr<c_Data> TaggedCache<c_Key, c_Data>::fetch(const key_type& key)
cache_iterator cit = mCache.find(key);
if (cit == mCache.end())
{
++mMisses;
return data_ptr();
}
cache_entry& entry = cit->second;
entry.touch();
if (entry.isCached())
{
++mHits;
return entry.ptr;
}
entry.ptr = entry.lock();
if (entry.isCached())
{
{ // independent of cache size, so not counted as a hit
++mCacheCount;
return entry.ptr;
}
mCache.erase(cit);
++mMisses;
return data_ptr();
}