internal void Dispose()
{
SRefMultiple sref = _sizedRef;
if (sref != null && Interlocked.CompareExchange(ref _sizedRef, null, sref) == sref)
{
sref.Dispose();
}
}
int GetCurrentPressure()
{
// Call GetUpdatedTotalCacheSize to update the total
// cache size, if there has been a recent Gen 2 Collection.
// This update must happen, otherwise the CacheManager won't
// know the total cache size.
int gen2Count = GC.CollectionCount(2);
SRefMultiple sref = _sizedRef;
if (gen2Count != _gen2Count && sref != null)
{
// update _gen2Count
_gen2Count = gen2Count;
// the SizedRef is only updated after a Gen2 Collection
// increment the index (it's either 1 or 0)
Debug.Assert(SAMPLE_COUNT == 2);
_idx = _idx ^ 1;
// remember the sample time
_cacheSizeSampleTimes[_idx] = DateTime.UtcNow;
// remember the sample value
_cacheSizeSamples[_idx] = sref.ApproximateSize;
#if DBG
Debug.Trace("CacheMemory", "SizedRef.ApproximateSize=" + _cacheSizeSamples[_idx]);
#endif
}
// if there's no memory limit, then there's nothing more to do
if (_memoryLimit <= 0)
{
return(0);
}
long cacheSize = _cacheSizeSamples[_idx];
// use _memoryLimit as an upper bound so that pressure is a percentage (between 0 and 100, inclusive).
if (cacheSize > _memoryLimit)
{
cacheSize = _memoryLimit;
}
// PerfCounter: Cache Percentage Process Memory Limit Used
// = memory used by this process / process memory limit at pressureHigh
// Set private bytes used in kilobytes because the counter is a DWORD
// BUGBUG: need to update description for this counter, or deprecate and introduce a new one for this usage
PerfCounters.SetCounter(AppPerfCounter.CACHE_PERCENT_PROC_MEM_LIMIT_USED, (int)(cacheSize >> KILOBYTE_SHIFT));
int result = (int)(cacheSize * 100 / _memoryLimit);
return(result);
}
internal CacheSizeMonitor(SRefMultiple sizedRef)
{
_sizedRef = sizedRef;
_gen2Count = GC.CollectionCount(2);
_cacheSizeSamples = new long[SAMPLE_COUNT];
_cacheSizeSampleTimes = new DateTime[SAMPLE_COUNT];
_pressureHigh = 99;
_pressureMiddle = 98;
_pressureLow = 97;
InitHistory();
}
internal CacheMemorySizePressure(SRefMultiple sizedRef)
{
_sizedRef = sizedRef;
_gen2Count = GC.CollectionCount(2);
_cacheSizeSamples = new long[SAMPLE_COUNT];
_cacheSizeSampleTimes = new DateTime[SAMPLE_COUNT];
_pressureHigh = 99;
_pressureMiddle = 98;
_pressureLow = 97;
_startupTime = DateTime.UtcNow;
InitHistory();
}
internal void Dispose()
{
SRefMultiple sref = _sizedRef;
if (sref != null && Interlocked.CompareExchange(ref _sizedRef, null, sref) == sref)
{
sref.Dispose();
}
ApplicationManager appManager = HostingEnvironment.GetApplicationManager();
if (appManager != null)
{
long sizeUpdate = (0 - _cacheSizeSamples[_idx]);
appManager.GetUpdatedTotalCacheSize(sizeUpdate);
}
}
internal CacheCommon() {
_cachePublic = new Cache(0);
_srefMultiple = new SRefMultiple();
_cacheMemoryStats = new CacheMemoryStats(_srefMultiple);
_enableMemoryCollection = true;
_enableExpiration = true;
}
internal CacheMemoryStats(SRefMultiple sizedRef)
{
_pressureTotalMemory = new CacheMemoryTotalMemoryPressure();
_pressureCacheSize = new CacheMemorySizePressure(sizedRef);
}
internal CacheMemoryStats(SRefMultiple sizedRef) {
_pressureTotalMemory = new CacheMemoryTotalMemoryPressure();
_pressureCacheSize = new CacheMemorySizePressure(sizedRef);
}
internal CacheMemorySizePressure(SRefMultiple sizedRef) {
_sizedRef = sizedRef;
_gen2Count = GC.CollectionCount(2);
_cacheSizeSamples = new long[SAMPLE_COUNT];
_cacheSizeSampleTimes = new DateTime[SAMPLE_COUNT];
_pressureHigh = 99;
_pressureMiddle = 98;
_pressureLow = 97;
_startupTime = DateTime.UtcNow;
InitHistory();
}
