Fully featured low overhead profiler for Java EE and Java SE platforms.
Easy-to-use performance and memory .NET profiler for Windows, Linux and macOS.
Secure and easy profiling in cloud, containers and clustered environments.
Performance monitoring and profiling of Jenkins, Bamboo, TeamCity, Gradle, Maven, Ant and JUnit.

Changes in version 2024.3

.NET support

  • caveat Minimum supported .NET Framework version is 4.6.1.

macOS support

  • improvement The Monitor Applications list now displays the CPU usage for .NET processes on macOS.


  • feature The profiler displays detected proxy settings when using the automatic proxy detection mode (the default mode). This can be very useful in cases where the profiler incorrectly identifies the proxy server, preventing connections with remote agents.

    Detected proxy


  • improvement Profiler agent does not log command line options unless the verbose option is specified.

User interface

  • feature We've enhanced the user experience for two-finger scrolling. The profiler eliminates minor finger tremors during scrolling, ensuring a smooth, jitter-free scroll. Currently, this functionality is utilized in the Threads view, but it will be adapted across other parts of the UI in upcoming versions.
  • feature The profiler now utilizes SSH to log into remote machines, enabling it to discover all running .NET applications, including those running with or without the profiler agent. If required, the profiler has the capability to upload the agent to the remote machine and seamlessly attach it to your application for detailed profiling.

    For authentication on the remote host, you can use plain password, SSH private key or SSH agent authentication methods.

    Thread state timeline
  • feature Introduced the ability to close (and later reopen) top tabs displaying profiling results when the profiler is connected to profiled applications.
  • feature Added functionality to reset collected profiling results when profiling is disabled. Previously, resetting was only possible while profiling was active.
  • improvement Double-clicking the drawer's button now toggles the collapse/expand state of the drawer.
  • improvement Summary tab now shows user-friendly .NET Framework version, similar to what System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription would show.
  • caveat The Performance charts view has been renamed to Telemetry.

CPU profiling

  • feature We have completely reimplemented the internals of our method tracer. Thanks to these changes, CPU tracing has become faster, more reliable, and it is now possible to trace CPU in attach mode. Previously, this functionality was available only with an agent loaded into the .NET runtime at the application's start.
  • fix We have fixed several CIL (formerly MSIL) instrumentation errors that could lead to the crash of the profiled application.

Thread profiling

We have completely overhauled the user interface for thread profiling. It's now more convenient, clearer, and works much faster. We've tried to address all the UX shortcomings you pointed out when working with the old interface.

  • feature The thread list has been turned into a table with columns, which can show an unlimited number of threads.

    Thread state timeline
  • feature You can sort threads by name and by consumed CPU time.
  • feature A tooltip appears upon mouse hover over individual thread activity bars, providing the name of the top method on the thread's stack.

    Method name in the tooltip
  • feature The ability to optionally display hot spots Hot spot on the thread timeline has been added.
  • feature Now it is possible to quickly change the range and scale of visible data in the thread state timeline using the actions from the toolbar: Show last 15 minutes, Show last 30 minutes, Show all
  • feature You can control auto-scrolling behavior using the Autoscroll button in the toolbar. When toggled, the timeline will be automatically scrolled to the right when new data arrives.
  • feature It is now possible to zoom in and zoom out the thread state timeline by Ctrl + Mouse wheel scrolling.
  • feature You can control the amount of data collected (and accordingly, the profiler overhead) when starting thread profiling. You can do this through the UI, as well as with threads startup option.

    Thread profiling options
  • feature You can now start Start thread profiling, stop Stop thread profiling, and reset Reset thread profiling thread profiling at any time.
  • improvement Data collection for thread profiling has been separated from data collection for telemetry. Now you can reset telemetry data and thread profiling results independently.
  • improvement The profiler better preserves fine details when changing the scale of the thread state timeline. In most cases, even very rare states will be visible even at the smallest scale.


  • feature The user interface has been updated with toolbar buttons to start Start telemetry collection and stop Stop telemetry collection telemetry collection, expanding control beyond the previous capability of only clearing collected telemetry.


  • feature It is now possible to record high-level events in attach mode. Previously, this functionality was available only with an agent loaded into the .NET runtime at the application's start.

IDE integration

  • feature JetBrains Rider 2024.1 is supported.

Exception profiling

  • feature Now you can profile exceptions in attach mode. In previous versions, this functionality was only available in the mode when the profiler agent was loaded into the .NET runtime at the application start.

Profiler API

  • feature New /ynp/api/v2/startTelemetry end-point to start telemetry collection.
  • feature New /ynp/api/v2/stopTelemetry end-point to stop telemetry collection.
  • feature New /ynp/api/v2/resetThreadProfiling end-point to reset thread profiling.
  • feature New methods in the profiler .NET API startTelemetry(), stopTelemetry() and resetTelemetry() to control telemetry collection.
  • improvement The response of getStatus request has been changed: flag stackTelemetry has been replaced with flag threadProfiling, flag telemetry has been added.
  • improvement The profiler HTTP API has been updated to version v2. We have added reset methods, which reset the profiling results and continue measurements. The HTTP API v1 is deprecated but continues to fully function. If you are using HTTP API v1, please make the corresponding changes.
  • improvement The Reset methods have been added to the YourKit.Profiler.Api.Controller class.


  • feature Added new actions StartTelemetry and StopTelemetry to start and stop a telemetry collection, respectively.
  • fix The profiler might crash if the profiled application finishes during the editing of triggers.
  • caveat Action StartAllocationRecording is replaced with StartAllocationProfiling.
  • caveat Action StopAllocationRecording is replaced with StopAllocationProfiling.


  • improvement New verbose option to increase the level of detail in the agent's log file.
  • improvement We slightly changed the format of the agent's log file to make it clearer at what time events occur. Instead of uptime, wall time is now always recorded.
  • improvement The command line interface was simplified by replacing multiple scripts (attach.sh, integrate.sh, export.sh) with a single profiler.sh script that accepts parameters. For example, use profiler.sh -integrate instead of integrate.sh. This streamlines operations and improves usability.
  • improvement Unified naming convention for agent options: Multi-word option names now utilize underscores for separation. Example change: from probetablelengthlimit to probe_table_length_limit. Legacy options remain functional, but users are encouraged to update to the new format.
  • caveat The following obsolete agent startup options have been removed: builtinprobes=all, builtinprobes=none, probe, noprobe, filters, samplingdelta, samplingperiod, onlylocal, do_advanced_port_check, skip_advanced_port_check, profileruipath, walltimespec


Deprecation means that we intend to remove the feature or capability from a future release of YourKit .NET Profiler. The feature or capability will continue to work and is fully supported until it is officially removed.

  • Trigger actions StartAllocationRecording and StopAllocationRecording are deprecated and scheduled for removal. If you use these actions in the configuration files, please replace them with StartAllocationProfiling and StopAllocationProfiling accordingly.
  • Trigger actions StartStackTelemetry and StopStackTelemetry are deprecated and scheduled for removal. If you use these actions in the configuration files, please replace them with StartThreadProfiling and StopThreadProfiling accordingly.
  • The HTTP API v1 is deprecated and scheduled for removal. Please switch to HTTP API v2.
  • HTTP API end-point /ynp/api/v1/startStackTelemetry has been deprecated. Use /ynp/api/v2/startThreadProfiling.
  • HTTP API end-point /ynp/api/v1/stopStackTelemetry has been deprecated. Use /ynp/api/v2/stopThreadProfiling.
  • Agent startup option disablestacktelemetry is deprecated in favor of new option threads=off.
  • Export option export.charts has been deprecated. Use export.telemetry to export the telemetry.

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