public void OnNext(RecycleLimitInfo recycleLimitInfo)
{
// Pretty much copied from the old CacheManager.CollectInfrequently implementation
// to keep things working exactly as before... though 'level' conveys the info we
// need surrounding GC frequency
if (recycleLimitInfo.TrimFrequency == RecycleLimitNotificationFrequency.High)
{
_lastTrimPercent = Math.Min(50, _lastTrimPercent + 10);
}
// if we're running into pressure infrequently, we may want to decrease the trim percentage
else if (_lastTrimPercent > 10 && recycleLimitInfo.TrimFrequency == RecycleLimitNotificationFrequency.Low)
{
_lastTrimPercent = Math.Max(10, _lastTrimPercent - 10);
}
long trimmedOrExpired = HostingEnvironment.TrimCache(_lastTrimPercent);
recycleLimitInfo.RequestGC = (trimmedOrExpired > 0);
return;
}
public void OnNext(LowPhysicalMemoryInfo lowMemoryInfo)
{
int percent = 0;
int gen2Count = GC.CollectionCount(2);
DateTime utcNow = DateTime.UtcNow;
// has there been a Gen 2 Collection since the last trim?
if (gen2Count != _lastTrimGen2Count)
{
// Old code used to check this, but if you look closely, when wired up in the default way,
// the default memory monitor only triggers the LowMemoryAction under high pressure. So this
// should always be true.
//if (IsAboveHighPressure()) {
// choose percent such that we don't repeat this for ~5 (TARGET_TOTAL_MEMORY_TRIM_INTERVAL) minutes,
// but keep the percentage between 10 and 50.
long ticksSinceTrim = utcNow.Subtract(_lastTrimTime).Ticks;
if (ticksSinceTrim > 0)
{
percent = Math.Min(50, (int)((_lastTrimPercent * TARGET_TOTAL_MEMORY_TRIM_INTERVAL_TICKS) / ticksSinceTrim));
percent = Math.Max(MIN_TOTAL_MEMORY_TRIM_PERCENT, percent);
}
#if PERF
SafeNativeMethods.OutputDebugString(String.Format("AspNetMemoryMonitor.GetPercentToTrim: percent={0:N}, lastTrimPercent={1:N}, secondsSinceTrim={2:N}\n",
percent,
_lastLowMemoryTrimPercent,
ticksSinceTrim / TimeSpan.TicksPerSecond));
#endif
HostingEnvironment.TrimCache(percent);
_lastTrimGen2Count = gen2Count;
_lastTrimTime = utcNow;
_lastTrimPercent = percent;
}
}
