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Runtime configuration options for debugging and profiling

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This article details the settings you can use to configure .NET debugging and profiling.

Note

.NET 6 standardizes on the prefix DOTNET_ instead of COMPlus_ for environment variables that configure .NET run-time behavior. However, the COMPlus_ prefix will continue to work. If you're using a previous version of the .NET runtime, you should still use the COMPlus_ prefix for environment variables.

Enable diagnostics

  • Configures whether the debugger, the profiler, and EventPipe diagnostics are enabled or disabled.
  • If you omit this setting, diagnostics are enabled. This is equivalent to setting the value to 1.
Setting name Values
runtimeconfig.json N/A N/A
Environment variable COMPlus_EnableDiagnostics or DOTNET_EnableDiagnostics 1 - enabled
0 - disabled

Enable profiling

  • Configures whether profiling is enabled for the currently running process.
  • If you omit this setting, profiling is disabled. This is equivalent to setting the value to 0.
Setting name Values
runtimeconfig.json N/A N/A
Environment variable CORECLR_ENABLE_PROFILING 0 - disabled
1 - enabled

Profiler GUID

  • Specifies the GUID of the profiler to load into the currently running process.
Setting name Values
runtimeconfig.json N/A N/A
Environment variable CORECLR_PROFILER string-guid

Profiler location

  • Specifies the path to the profiler DLL to load into the currently running process (or 32-bit or 64-bit process).
  • If more than one variable is set, the bitness-specific variables take precedence. They specify which bitness of profiler to load.
  • For more information, see Finding the profiler library.
Setting name Values
Environment variable CORECLR_PROFILER_PATH string-path
Environment variable CORECLR_PROFILER_PATH_32 string-path
Environment variable CORECLR_PROFILER_PATH_64 string-path

Export perf maps

  • Enables or disables emitting perf maps to /tmp/perf-$pid.map. Perf maps allow third party tools, such as perf, to identify call sites from precompiled ReadyToRun (R2R) modules.
  • If you omit this setting, writing the perf map is disabled. This is equivalent to setting the value to 0.
  • When perf maps are disabled, not all managed callsites will be properly resolved.
  • Enabling perf maps causes a 10-20% overhead.
Setting name Values
runtimeconfig.json N/A N/A
Environment variable COMPlus_PerfMapEnabled or DOTNET_PerfMapEnabled 0 - disabled
1 - enabled

Perf log markers

  • Enables or disables the specified signal to be accepted and ignored as a marker in the perf logs.
  • If you omit this setting, the specified signal is not ignored. This is equivalent to setting the value to 0.
Setting name Values
runtimeconfig.json N/A N/A
Environment variable COMPlus_PerfMapIgnoreSignal or DOTNET_PerfMapIgnoreSignal 0 - disabled
1 - enabled

Note

This setting is ignored if DOTNET_PerfMapEnabled is omitted or set to 0 (that is, disabled).