private void PrintDiff(int topN, StringAnalysisResult res, StringAnalysisResult res2)
{
var top = res.StringCounts.OrderByDescending(kvp => kvp.Value.InstanceCount).Take(topN).ToDictionary(x => x.Key, x => x.Value);
var top2 = res2.StringCounts.OrderByDescending(kvp => kvp.Value.InstanceCount).Take(topN).ToDictionary(x => x.Key, x => x.Value);
HashSet <string> uniqueStringValues = new HashSet <string>(top.Select(x => x.Key).Concat(top2.Select(x => x.Key)).ToArray());
List <StringDiff> diffs = new List <StringDiff>();
foreach (var stringValue in uniqueStringValues)
{
ObjectStatistics stat = null;
ObjectStatistics stat2 = null;
top.TryGetValue(stringValue, out stat);
top2.TryGetValue(stringValue, out stat2);
diffs.Add(new StringDiff
{
DiffInBytes = (stat2 != null ? stat2.AllocatedInBytes : 0) - (stat != null ? stat.AllocatedInBytes : 0),
InstanceDiffCount = (stat2 != null ? stat2.InstanceCount : 0) - (stat != null ? stat.InstanceCount : 0),
Stat = stat,
Stat2 = stat2,
Value = stringValue
});
}
var sortedDiffs = diffs.OrderByDescending(x => Math.Abs(x.DiffInBytes)).ToArray();
Console.WriteLine("String Allocation Diff Statistics");
string fmtString = "{0,-12:N0}\t{1,17:N0}\t{2,-11:N0}\t{3,-11:N0}\t{4,-17:N0}\t{5,-18:N0}\t{6}";
OutputStringWriter.FormatAndWrite(fmtString, $"Delta({DisplayUnit})", "Delta(Instances)", "Instances", "Instances2", $"Allocated({DisplayUnit})", $"Allocated2({DisplayUnit})", "Value");
long displayUnitDiv = (long)DisplayUnit;
foreach (var diff in sortedDiffs)
{
OutputStringWriter.FormatAndWrite(fmtString, diff.DiffInBytes / displayUnitDiv, diff.InstanceDiffCount, diff?.Stat?.InstanceCount, diff?.Stat2?.InstanceCount, diff?.Stat?.AllocatedInBytes / displayUnitDiv, diff?.Stat2?.AllocatedInBytes / displayUnitDiv, GetShortString(diff.Value));
}
var deltaCount = res2.StringObjectCount - res.StringObjectCount;
var deltaWaste = res2.StringWasteInBytes - res.StringWasteInBytes;
var deltaBytes = res2.StringsAllocatedInBytes - res.StringsAllocatedInBytes;
OutputStringWriter.FormatAndWrite(fmtString, deltaBytes / displayUnitDiv, deltaCount, res.StringObjectCount, res2.StringObjectCount,
res.StringsAllocatedInBytes / displayUnitDiv, res2.StringsAllocatedInBytes / displayUnitDiv, "Strings(Total)");
}
static StringAnalysisResult Analyze(ClrHeap heap, bool bLiveOnly)
{
var stringUsages = new Dictionary <string, ObjectStatistics>();
foreach (var instance in GetObjectAddresses(heap, bLiveOnly))
{
var type = heap.GetObjectType(instance);
if (type != null && type.IsString)
{
var value = (string)type.GetValue(instance);
ObjectStatistics countAndSize = null;
if (stringUsages.TryGetValue(value, out countAndSize))
{
countAndSize.InstanceCount++;
}
else
{
var size = type.GetSize(instance);
stringUsages[value] = new ObjectStatistics {
SizePerInstance = (long)size, InstanceCount = 1, SampleAddress = instance
};
}
}
}
var stringWasteInBytes = stringUsages.Values.Sum(o => (long)o.SizePerInstance * (long)(o.InstanceCount - 1));
var stringObjectCount = stringUsages.Values.Sum(o => (long)o.InstanceCount);
var stringsAllocatedBytes = stringUsages.Values.Sum(o => (long)o.AllocatedInBytes);
return(new StringAnalysisResult
{
StringCounts = stringUsages,
StringWasteInBytes = stringWasteInBytes,
StringObjectCount = stringObjectCount,
StringsAllocatedInBytes = stringsAllocatedBytes
});
}