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dotnet-trace diagnostic tool - .NET CLI - .NET

This article applies to: ✔️ dotnet-trace 9.0.625801 and later versions

There are two ways to download and install dotnet-trace:

• dotnet global tool:

  To install the latest release version of the dotnet-trace NuGet package, use the dotnet tool install command:

  dotnet tool install --global dotnet-trace
  

• Direct download:

  Download the tool executable that matches your platform:

dotnet-trace [-h, --help] [--version] <command>

The dotnet-trace tool:

• Is a cross-platform .NET Core tool.
• Enables the collection of .NET Core traces of a running process without a native profiler.
• Is built on EventPipe of the .NET Core runtime.
• Delivers the same experience on Windows, Linux, or macOS.

• -h|--help

  Shows command-line help.

• --version

  Displays the version of the dotnet-trace utility.

• --duration

  How long to run the trace. --duration 00:00:00:05 will run it for 5 seconds.

Collects a diagnostic trace from a running process or launches a child process and traces it (.NET 5 or later). To have the tool run a child process and trace it from its startup, append -- to the collect command.

dotnet-trace collect [--buffersize <size>] [--clreventlevel <clreventlevel>] [--clrevents <clrevents>]
    [--dsrouter <ios|ios-sim|android|android-emu>]
    [--format <Chromium|NetTrace|Speedscope>] [-h|--help] [--duration dd:hh:mm:ss]
    [-n, --name <name>] [--diagnostic-port] [-o|--output <trace-file-path>] [-p|--process-id <pid>]
    [--profile <profile-name>] [--providers <list-of-comma-separated-providers>]
    [-- <command>] (for target applications running .NET 5 or later)
    [--show-child-io] [--resume-runtime]
    [--stopping-event-provider-name <stoppingEventProviderName>]
    [--stopping-event-event-name <stoppingEventEventName>]
    [--stopping-event-payload-filter <stoppingEventPayloadFilter>]

• --buffersize <size>

  Sets the size of the in-memory buffer, in megabytes. Default 256 MB.

  Note

  If the target process emits events faster than they can be written to disk, this buffer may overflow and some events will be dropped. You can mitigate this problem by increasing the buffer size or reducing the number of events being recorded.

• --clreventlevel <clreventlevel>

  Verbosity of CLR events to be emitted. The following table shows the available event levels.

  String value Numeric value logalways 0 critical 1 error 2 warning 3 informational 4 verbose 5

• --clrevents <clrevents>

  A list of CLR runtime provider keywords to enable separated by + signs. This is a simple mapping that lets you specify event keywords via string aliases rather than their hex values. For example, dotnet-trace collect --providers Microsoft-Windows-DotNETRuntime:3:4 requests the same set of events as dotnet-trace collect --clrevents gc+gchandle --clreventlevel informational. The table below shows the list of available keywords:

  Keyword String Alias Keyword Hex Value gc 0x1 gchandle 0x2 fusion 0x4 loader 0x8 jit 0x10 ngen 0x20 startenumeration 0x40 endenumeration 0x80 security 0x400 appdomainresourcemanagement 0x800 jittracing 0x1000 interop 0x2000 contention 0x4000 exception 0x8000 threading 0x10000 jittedmethodiltonativemap 0x20000 overrideandsuppressngenevents 0x40000 type 0x80000 gcheapdump 0x100000 gcsampledobjectallocationhigh 0x200000 gcheapsurvivalandmovement 0x400000 gcheapcollect 0x800000 gcheapandtypenames 0x1000000 gcsampledobjectallocationlow 0x2000000 perftrack 0x20000000 stack 0x40000000 threadtransfer 0x80000000 debugger 0x100000000 monitoring 0x200000000 codesymbols 0x400000000 eventsource 0x800000000 compilation 0x1000000000 compilationdiagnostic 0x2000000000 methoddiagnostic 0x4000000000 typediagnostic 0x8000000000 waithandle 0x40000000000

  You can read about the CLR provider more in detail on the .NET runtime provider reference documentation.

• `--dsrouter {ios|ios-sim|android|android-emu}

Starts dotnet-dsrouter and connects to it. Requires dotnet-dsrouter to be installed. Run dotnet-dsrouter -h for more information.

• --format {Chromium|NetTrace|Speedscope}

  Sets the output format for the trace file conversion. The default is NetTrace.

• -n, --name <name>

  The name of the process to collect the trace from.

  Note

  On Linux and macOS, using this option requires the target application and dotnet-trace to share the same TMPDIR environment variable. Otherwise, the command will time out.

• --diagnostic-port <port-address[,(listen|connect)]>

  Sets the diagnostic port used to communicate with the process to be traced. dotnet-trace and the .NET runtime inside the target process must agree on the port-address, with one listening and the other connecting. dotnet-trace automatically determines the correct port when attaching using the --process-id or --name options, or when launching a process using the -- <command> option. It's usually only necessary to specify the port explicitly when waiting for a process that will start in the future or communicating to a process that is running inside a container that isn't part of the current process namespace.

  The port-address differs by OS:

  • Linux and macOS - a path to a Unix domain socket such as /foo/tool1.socket.
  • Windows - a path to a named pipe such as \\.\pipe\my_diag_port1.
  • Android, iOS, and tvOS - an IP:port such as 127.0.0.1:9000.

  By default, dotnet-trace listens at the specified address. You can request dotnet-trace to connect instead by appending ,connect after the address. For example, --diagnostic-port /foo/tool1.socket,connect will connect to a .NET runtime process that is listening to the /foo/tool1.socket Unix domain socket.

  To learn how to use this option to collect a trace from app startup, see Use diagnostic port to collect a trace from app startup.

• --duration <time-to-run>

  The time for the trace to run. Use the dd:hh:mm:ss format. For example 00:00:00:05 will run it for 5 seconds.

• -o|--output <trace-file-path>

  The output path for the collected trace data. If not specified it defaults to <appname>_<yyyyMMdd>_<HHmmss>.nettrace, for example, `myapp_20210315_111514.nettrace``.

• -p|--process-id <PID>

  The process ID to collect the trace from.

  Note

  On Linux and macOS, using this option requires the target application and dotnet-trace to share the same TMPDIR environment variable. Otherwise, the command will time out.

• --profile <profile-name>

  A named pre-defined set of provider configurations that allows common tracing scenarios to be specified succinctly. The following profiles are available:

• --providers <list-of-comma-separated-providers>

  A comma-separated list of EventPipe providers to be enabled. These providers supplement any providers implied by --profile <profile-name>. If there's any inconsistency for a particular provider, this configuration takes precedence over the implicit configuration from the profile.

  This list of providers is in the form:

  • Provider[,Provider]
  • Provider is in the form: KnownProviderName[:Flags[:Level][:KeyValueArgs]].
  • KeyValueArgs is in the form: [key1=value1][;key2=value2].

  To learn more about some of the well-known providers in .NET, refer to Well-known Event Providers.

• -- <command> (for target applications running .NET 5 or later)

  After the collection configuration parameters, the user can append -- followed by a command to start a .NET application with at least a 5.0 runtime. This may be helpful when diagnosing issues that happen early in the process, such as startup performance issue or assembly loader and binder errors.

  Note

  Using this option monitors the first .NET process that communicates back to the tool, which means if your command launches multiple .NET applications, it will only collect the first app. Therefore, it is recommended you use this option on self-contained applications, or using the dotnet exec <app.dll> option.

• --show-child-io

  Shows the input and output streams of a launched child process in the current console.

• --resume-runtime

  Resume runtime once session has been initialized, defaults to true. Disable resume of runtime using --resume-runtime:false.

• --stopping-event-provider-name

  A string, parsed as-is, that will stop the trace upon hitting an event with the matching provider name. For a more specific stopping event, additionally provide --stopping-event-event-name and/or --stopping-event-payload-filter. for example, --stopping-event-provider-name Microsoft-Windows-DotNETRuntime to stop the trace upon hitting the first event emitted by the Microsoft-Windows-DotNETRuntime event provider.

• --stopping-event-event-name

  A string, parsed as-is, that will stop the trace upon hitting an event with the matching event name. Requires --stopping-event-provider-name to be set. For a more specific stopping event, additionally provide --stopping-event-payload-filter. for example, --stopping-event-provider-name Microsoft-Windows-DotNETRuntime --stopping-event-event-name Method/JittingStarted to stop the trace upon hitting the first Method/JittingStarted event emitted by the Microsoft-Windows-DotNETRuntime event provider.

• --stopping-event-payload-filter

  A string, parsed as [payload_field_name]:[payload_field_value] pairs separated by commas, that will stop the trace upon hitting an event containing all specified payload pairs. Requires --stopping-event-provider-name and --stopping-event-event-name to be set. for example, --stopping-event-provider-name Microsoft-Windows-DotNETRuntime --stopping-event-event-name Method/JittingStarted --stopping-event-payload-filter MethodNameSpace:Program,MethodName:OnButtonClick to stop the trace upon the first Method/JittingStarted event for the method OnButtonClick in the Program namespace emitted by the Microsoft-Windows-DotNETRuntime event provider.

Note

• Stopping the trace may take a long time (up to minutes) for large applications. The runtime needs to send over the type cache for all managed code that was captured in the trace.

• To collect a trace using dotnet-trace, it needs to be run as the same user as the user running the target process or as root. Otherwise, the tool will fail to establish a connection with the target process.

• If you experience an unhandled exception while running dotnet-trace collect, this results in an incomplete trace. If finding the root cause of the exception is your priority, navigate to Collect dumps on crash. As a result of the unhandled exception, the trace is truncated when the runtime shuts down to prevent other undesired behavior such as a hang or data corruption. Even though the trace is incomplete, you can still open it to see what happened leading up to the failure. However, it will be missing Rundown information (this happens at the end of a trace) so stacks might be unresolved (depending on what providers were turned on). Open the trace by executing PerfView with the /ContinueOnError flag at the command line. The logs will also contain the location the exception was fired.

• When specifying a stopping event through the --stopping-event-* options, as the EventStream is being parsed asynchronously, there will be some events that pass through between the time a trace event matching the specified stopping event options is parsed and the EventPipeSession is stopped.

Converts nettrace traces to alternate formats for use with alternate trace analysis tools.

dotnet-trace convert [<input-filename>] [--format <Chromium|NetTrace|Speedscope>] [-h|--help] [-o|--output <output-filename>]

• <input-filename>

  Input trace file to be converted. Defaults to trace.nettrace.

• --format <Chromium|NetTrace|Speedscope>

  Sets the output format for the trace file conversion.

• -o|--output <output-filename>

  Output filename. Extension of target format will be added.

Note

Converting nettrace files to chromium or speedscope files is irreversible. speedscope and chromium files don't have all the information necessary to reconstruct nettrace files. However, the convert command preserves the original nettrace file, so don't delete this file if you plan to open it in the future.

Lists the dotnet processes that traces can be collected from. dotnet-trace 6.0.320703 and later, also display the command-line arguments that each process was started with, if available.

Note

To get full information for enumerated 64 bit processes, you need to use a 64-bit version of the dotnet-trace tool.

dotnet-trace ps [-h|--help]

Suppose you start a long-running app using the command dotnet run --configuration Release. In another window, you run the dotnet-trace ps command. The output you'll see is as follows. The command-line arguments, if available, are shown in dotnet-trace version 6.0.320703 and later.

> dotnet-trace ps

  21932 dotnet     C:\Program Files\dotnet\dotnet.exe   run --configuration Release
  36656 dotnet     C:\Program Files\dotnet\dotnet.exe

Lists pre-built tracing profiles with a description of what providers and filters are in each profile.

dotnet-trace list-profiles [-h|--help]

Creates a report into stdout from a previously generated trace.

dotnet-trace report [-h|--help] <tracefile> [command]

• <tracefile>

  The file path for the trace being analyzed.

Finds the top N methods that have been on the callstack the longest.

dotnet-trace report <tracefile> topN [-n|--number <n>] [--inclusive] [-v|--verbose] [-h|--help]

• -n|--number <n>

Gives the top N methods on the callstack.

• --inclusive

Output the top N methods based on inclusive time. If not specified, exclusive time is used by default.

• -v|--verbose

Output the parameters of each method in full. If not specified, parameters will be truncated.

To collect traces using dotnet-trace:

• Get the process identifier (PID) of the .NET Core application to collect traces from.

  • On Windows, you can use Task Manager or the tasklist command, for example.
  • On Linux, for example, the ps command.
  • dotnet-trace ps

• Run the following command:

  dotnet-trace collect --process-id <PID>
  

  The preceding command generates output similar to the following:

  Press <Enter> to exit...
  Connecting to process: <Full-Path-To-Process-Being-Profiled>/dotnet.exe
  Collecting to file: <Full-Path-To-Trace>/trace.nettrace
  Session Id: <SessionId>
  Recording trace 721.025 (KB)
  

• Stop collection by pressing the <Enter> key. dotnet-trace will finish logging events to the trace.nettrace file.

Sometimes it may be useful to collect a trace of a process from its startup. For apps running .NET 5 or later, it is possible to do this by using dotnet-trace.

This will launch hello.exe with arg1 and arg2 as its command-line arguments and collect a trace from its runtime startup:

dotnet-trace collect -- hello.exe arg1 arg2

The preceding command generates output similar to the following:

No profile or providers specified, defaulting to trace profile 'cpu-sampling'

Provider Name                           Keywords            Level               Enabled By
Microsoft-DotNETCore-SampleProfiler     0x0000F00000000000  Informational(4)    --profile
Microsoft-Windows-DotNETRuntime         0x00000014C14FCCBD  Informational(4)    --profile

Process        : E:\temp\gcperfsim\bin\Debug\net5.0\gcperfsim.exe
Output File    : E:\temp\gcperfsim\trace.nettrace


[00:00:00:05]   Recording trace 122.244  (KB)
Press <Enter> or <Ctrl+C> to exit...

You can stop collecting the trace by pressing <Enter> or <Ctrl + C> key. Doing this will also exit hello.exe.

Note

Launching hello.exe via dotnet-trace will redirect its input/output and you won't be able to interact with it on the console by default. Use the --show-child-io switch to interact with its stdin/stdout. Exiting the tool via CTRL+C or SIGTERM will safely end both the tool and the child process. If the child process exits before the tool, the tool will exit as well and the trace should be safely viewable.

Diagnostic port is a runtime feature added in .NET 5 that allows you to start tracing from app startup. To do this using dotnet-trace, you can either use dotnet-trace collect -- <command> as described in the examples above, or use the --diagnostic-port option.

Using dotnet-trace <collect|monitor> -- <command> to launch the application as a child process is the simplest way to quickly trace the application from its startup.

However, when you want to gain a finer control over the lifetime of the app being traced (for example, monitor the app for the first 10 minutes only and continue executing) or if you need to interact with the app using the CLI, using --diagnostic-port option allows you to control both the target app being monitored and dotnet-trace.

1. The command below makes dotnet-trace create a diagnostics socket named myport.sock and wait for a connection.

   dotnet-trace collect --diagnostic-port myport.sock
   

   Output:

   Waiting for connection on myport.sock
   Start an application with the following environment variable: DOTNET_DiagnosticPorts=/home/user/myport.sock
   

2. In a separate console, launch the target application with the environment variable DOTNET_DiagnosticPorts set to the value in the dotnet-trace output.

   export DOTNET_DiagnosticPorts=/home/user/myport.sock
   ./my-dotnet-app arg1 arg2
   

   This should then enable dotnet-trace to start tracing my-dotnet-app:

   Waiting for connection on myport.sock
   Start an application with the following environment variable: DOTNET_DiagnosticPorts=myport.sock
   Starting a counter session. Press Q to quit.
   

   Important

   Launching your app with dotnet run can be problematic because the dotnet CLI may spawn many child processes that are not your app and they can connect to dotnet-trace before your app, leaving your app to be suspended at run time. It is recommended you directly use a self-contained version of the app or use dotnet exec to launch the application.

On Windows, you can view .nettrace files in Visual Studio or PerfView for analysis.

On Linux, you can view the trace by changing the output format of dotnet-trace to speedscope. Change the output file format by using the -f|--format option. You can choose between nettrace (the default option) and speedscope. The option -f speedscope will make dotnet-trace produce a speedscope file. Speedscope files can be opened at https://www.speedscope.app.

For traces collected on non-Windows platforms, you can also move the trace file to a Windows machine and view it in Visual Studio or PerfView.

Note

The .NET Core runtime generates traces in the nettrace format. The traces are converted to speedscope (if specified) after the trace is completed. Since some conversions may result in loss of data, the original nettrace file is preserved next to the converted file.

You can launch dotnet-trace with an .rsp file that contains the arguments to pass. This can be useful when enabling providers that expect lengthy arguments or when using a shell environment that strips characters.

For example, the following provider can be cumbersome to type out each time you want to trace:

dotnet-trace collect --providers Microsoft-Diagnostics-DiagnosticSource:0x3:5:FilterAndPayloadSpecs="SqlClientDiagnosticListener/System.Data.SqlClient.WriteCommandBefore@Activity1Start:-Command;Command.CommandText;ConnectionId;Operation;Command.Connection.ServerVersion;Command.CommandTimeout;Command.CommandType;Command.Connection.ConnectionString;Command.Connection.Database;Command.Connection.DataSource;Command.Connection.PacketSize\r\nSqlClientDiagnosticListener/System.Data.SqlClient.WriteCommandAfter@Activity1Stop:\r\nMicrosoft.EntityFrameworkCore/Microsoft.EntityFrameworkCore.Database.Command.CommandExecuting@Activity2Start:-Command;Command.CommandText;ConnectionId;IsAsync;Command.Connection.ClientConnectionId;Command.Connection.ServerVersion;Command.CommandTimeout;Command.CommandType;Command.Connection.ConnectionString;Command.Connection.Database;Command.Connection.DataSource;Command.Connection.PacketSize\r\nMicrosoft.EntityFrameworkCore/Microsoft.EntityFrameworkCore.Database.Command.CommandExecuted@Activity2Stop:",OtherProvider,AnotherProvider

In addition, the previous example contains " as part of the argument. Because quotes are not handled equally by each shell, you may experience various issues when using different shells. For example, the command to enter in zsh is different to the command in cmd.

Instead of typing this each time, you can save the following text into a file called myprofile.rsp.

--providers
Microsoft-Diagnostics-DiagnosticSource:0x3:5:FilterAndPayloadSpecs="SqlClientDiagnosticListener/System.Data.SqlClient.WriteCommandBefore@Activity1Start:-Command;Command.CommandText;ConnectionId;Operation;Command.Connection.ServerVersion;Command.CommandTimeout;Command.CommandType;Command.Connection.ConnectionString;Command.Connection.Database;Command.Connection.DataSource;Command.Connection.PacketSize\r\nSqlClientDiagnosticListener/System.Data.SqlClient.WriteCommandAfter@Activity1Stop:\r\nMicrosoft.EntityFrameworkCore/Microsoft.EntityFrameworkCore.Database.Command.CommandExecuting@Activity2Start:-Command;Command.CommandText;ConnectionId;IsAsync;Command.Connection.ClientConnectionId;Command.Connection.ServerVersion;Command.CommandTimeout;Command.CommandType;Command.Connection.ConnectionString;Command.Connection.Database;Command.Connection.DataSource;Command.Connection.PacketSize\r\nMicrosoft.EntityFrameworkCore/Microsoft.EntityFrameworkCore.Database.Command.CommandExecuted@Activity2Stop:",OtherProvider,AnotherProvider

Once you've saved myprofile.rsp, you can launch dotnet-trace with this configuration using the following command:

dotnet-trace @myprofile.rsp

• Well-known event providers from .NET

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