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Trigger dumps asynchronously #2533

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Aug 26, 2020
Merged

Trigger dumps asynchronously #2533

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69de9cf
Run each dump in a task in netclient dumper
nohwnd Aug 21, 2020
f2df542
More reasonable timeout
nohwnd Aug 21, 2020
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63 changes: 38 additions & 25 deletions src/Microsoft.TestPlatform.Extensions.BlameDataCollector/NetClientHangDumper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,12 @@
namespace Microsoft.TestPlatform.Extensions.BlameDataCollector
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Diagnostics.NETCore.Client;
using Microsoft.VisualStudio.TestPlatform.ObjectModel;
using Microsoft.VisualStudio.TestPlatform.Utilities;
Expand Down Expand Up @@ -40,35 +43,45 @@ public void Dump(int processId, string outputDirectory, DumpTypeOption type)

var bottomUpTree = processTree.OrderByDescending(t => t.Level).Select(t => t.Process);

// Do not suspend processes with NetClient dumper it stops the diagnostic thread running in
// them and hang dump request will get stuck forever, because the process is not co-operating.
// Instead we start one task per dump asynchronously, and hope that the parent process will start dumping
// before the child process is done dumping. This way if the parent is waiting for the children to exit,
// we will be dumping it before it observes the child exiting and we get a more accurate results. If we did not
// do this, then parent that is awaiting child might exit before we get to dumping it.
var tasks = new List<Task>();
var timeout = new CancellationTokenSource();
timeout.CancelAfter(TimeSpan.FromMinutes(5));
foreach (var p in bottomUpTree)
{
try
{
p.Suspend();
}
catch (Exception ex)
{
EqtTrace.Error($"NetClientHangDumper.Dump: Error suspending process {p.Id} - {p.ProcessName}: {ex}.");
}
}
tasks.Add(Task.Run(
() =>
{
try
{
var outputFile = Path.Combine(outputDirectory, $"{p.ProcessName}_{p.Id}_{DateTime.Now:yyyyMMddTHHmmss}_hangdump.dmp");
EqtTrace.Verbose($"NetClientHangDumper.CollectDump: Selected dump type {type}. Dumping {process.Id} - {process.ProcessName} in {outputFile}. ");

foreach (var p in bottomUpTree)
{
try
{
var outputFile = Path.Combine(outputDirectory, $"{p.ProcessName}_{p.Id}_{DateTime.Now:yyyyMMddTHHmmss}_hangdump.dmp");
EqtTrace.Verbose($"NetClientHangDumper.CollectDump: Selected dump type {type}. Dumping {process.Id} - {process.ProcessName} in {outputFile}. ");
var client = new DiagnosticsClient(p.Id);

var client = new DiagnosticsClient(p.Id);
// Connecting the dump generation logging to verbose output to avoid changing the interfaces again -> EqtTrace.IsVerboseEnabled
// before we test this on some big repo.
client.WriteDump(type == DumpTypeOption.Full ? DumpType.Full : DumpType.Normal, outputFile, logDumpGeneration: false);
}
catch (Exception ex)
{
EqtTrace.Error($"NetClientHangDumper.Dump: Error dumping process {p.Id} - {p.ProcessName}: {ex}.");
}
}, timeout.Token));
}

// Connecting the dump generation logging to verbose output to avoid changing the interfaces again -> EqtTrace.IsVerboseEnabled
// before we test this on some big repo.
client.WriteDump(type == DumpTypeOption.Full ? DumpType.Full : DumpType.Normal, outputFile, logDumpGeneration: false);
}
catch (Exception ex)
{
EqtTrace.Error($"NetClientHangDumper.Dump: Error dumping process {p.Id} - {p.ProcessName}: {ex}.");
}
try
{
Task.WhenAll(tasks).GetAwaiter().GetResult();
}
catch (TaskCanceledException)
{
EqtTrace.Error($"NetClientHangDumper.Dump: Hang dump timed out.");
}

foreach (var p in bottomUpTree)
Expand All @@ -83,6 +96,6 @@ public void Dump(int processId, string outputDirectory, DumpTypeOption type)
EqtTrace.Error($"NetClientHangDumper.Dump: Error killing process {p.Id} - {p.ProcessName}: {ex}.");
}
}
}
}
}
}