// Process a trace and create a summary.
static SnapshotSummary GetAllocSummary(ITraceProcessor trace)
{
var pendingSnapshotData = trace.UseHeapSnapshots();
var pendingSymbols = trace.UseSymbols();
trace.Process();
var snapshotData = pendingSnapshotData.Result;
var symbols = pendingSymbols.Result;
symbols.LoadSymbolsAsync(new SymCachePath(@"c:\symcache")).GetAwaiter().GetResult();
if (snapshotData.Snapshots.Count != 1)
{
Console.Error.WriteLine("Trace must contain exactly one heap snapshot - actually contained {0}.",
snapshotData.Snapshots.Count);
return(new SnapshotSummary(null, 0));
}
// Scan through all of the allocations and collect them by
// SnapshotUniqueStackId (which corresponds to Stack Ref#),
// accumulating the bytes allocated, allocation count, and the
// stack.
var allocsByStackId = new Dictionary <ulong, AllocDetails>();
foreach (IHeapAllocation row in snapshotData.Snapshots[0].Allocations)
{
allocsByStackId.TryGetValue(row.SnapshotUniqueStackId, out AllocDetails value);
value.Stack = row.Stack;
value.Size += row.Size;
value.Count += 1;
allocsByStackId[row.SnapshotUniqueStackId] = value;
}
// Count how many allocations each stack frame is part of.
// RtlThreadStart will presumably be near the top, along with
// RtlpAllocateHeapInternal, but some clues may be found.
var hotStackFrames = new Dictionary <string, long>();
foreach (var data in allocsByStackId.Values)
{
foreach (var entry in data.Stack)
{
var analyzerString = entry.GetAnalyzerString();
hotStackFrames.TryGetValue(analyzerString, out long count);
count += data.Count;
hotStackFrames[analyzerString] = count;
}
}
var result = new SnapshotSummary(allocsByStackId, snapshotData.Snapshots[0].ProcessId);
// Create a summary of the alloc counts and byte counts.
var totalAllocBytes = DataSize.Zero;
long totalAllocCount = 0;
foreach (var data in allocsByStackId.Values)
{
totalAllocBytes += data.Size;
totalAllocCount += data.Count;
}
result.hotStackFrames_ = hotStackFrames;
result.totalBytes_ = totalAllocBytes;
result.allocCount_ = totalAllocCount;
return(result);
}
