static extern bool GlobalMemoryStatusEx([In, Out] MEMORYSTATUSEX lpBuffer);
//Add the feature string into list and get feature string id
public long GetOrAddId(string strFeature)
{
while (ShrinkingLock == 1)
{
Thread.Sleep(5000);
}
//add item-adding lock
Interlocked.Increment(ref AddLock);
var newFFItem = new FeatureFreq();
newFFItem.strFeature = strFeature;
newFFItem.value = 1;
if (sortedEndIndex > 0)
{
var ff = arrayFeatureFreq.BinarySearch(0, sortedEndIndex, newFFItem);
if (ff != null)
{
Interlocked.Increment(ref ff.value);
//free item-adding lock
Interlocked.Decrement(ref AddLock);
return(GetId(strFeature));
}
}
var oldValue = Interlocked.Increment(ref arrayFeatureFreqSize) - 1;
arrayFeatureFreq[oldValue] = newFFItem;
//free item-adding lock
Interlocked.Decrement(ref AddLock);
//Check whether shrink process should be started
uint memoryLoad = 0;
if (oldValue % 10000000 == 0)
{
var msex = new MEMORYSTATUSEX();
GlobalMemoryStatusEx(msex);
memoryLoad = msex.dwMemoryLoad;
}
if (memoryLoad >= SHRINK_AVALI_MEM_LOAD)
{
if (Interlocked.CompareExchange(ref ShrinkingLock, 1, 0) == 0)
{
//Double check whether shrink should be started
var msex = new MEMORYSTATUSEX();
GlobalMemoryStatusEx(msex);
if (msex.dwMemoryLoad >= SHRINK_AVALI_MEM_LOAD)
{
while (AddLock != 0)
{
Thread.Sleep(1000);
}
var startDT = DateTime.Now;
Console.WriteLine("Begin to shrink [Feature Size: {0}]...", arrayFeatureFreqSize);
var newArrayFeatureFreqSize = Shrink(0, arrayFeatureFreqSize - 1, 0) + 1;
GlobalMemoryStatusEx(msex);
if (msex.dwMemoryLoad >= SHRINK_AVALI_MEM_LOAD - 1)
{
//Still have enough available memory, raise shrink threshold
SHRINK_AVALI_MEM_LOAD = msex.dwMemoryLoad + 1;
if (SHRINK_AVALI_MEM_LOAD >= 100)
{
//if use more than 100% memory, the performance will extremely reduce
SHRINK_AVALI_MEM_LOAD = 100;
}
}
arrayFeatureFreqSize = newArrayFeatureFreqSize;
var ts = DateTime.Now - startDT;
Console.WriteLine("Shrink has been done!");
Console.WriteLine("[Feature Size:{0}, TimeSpan:{1}, Next Shrink Rate:{2}%]", arrayFeatureFreqSize, ts, SHRINK_AVALI_MEM_LOAD);
}
Interlocked.Decrement(ref ShrinkingLock);
}
}
return(GetId(strFeature));
}
