CUDA Profiler Tools Interface (CUPTI) for CUDA Toolkit 12.5 is now available

Developer Tools CUPTI – CUDA Profiler Tools Interface
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CUDA Profiler Tools Interface (CUPTI) for CUDA Toolkit 12.5 is now available for download in the NVIDIA Registered Developer Program.

The NVIDIA CUDA Profiler Tools Interface (CUPTI) for CUDA Toolkit is a dynamic library that enables the creation of profiling and tracing tools that target CUDA applications. CUPTI provides a set of APIs targeted at ISVs creating profilers and other performance optimization tools:
  • the Activity API,
  • the Callback API,
  • the Event API,
  • the Metric API,
  • the Profiler API,
  • the PC Sampling API,
  • the SASS Metric API, and
  • the Checkpoint API
Using these CUPTI APIs, independent software developers can create profiling tools that provide low and deterministic profiling overhead on the target system, while giving insight into the CPU and GPU behavior of CUDA applications.

Updates in CUDA Toolkit 12.5 Update 1

    Resolved Issues
    • Fixed an issue due to which resource callback CUPTI_CBID_RESOURCE_MODULE_PROFILED might not be issued when no other activity is enabled. This issue was introduced in the CUDA 12.4 Update 1 release.
    • Fixed a crash for the graph level tracing for CUDA graphs.

Updates in CUDA Toolkit 12.5

    New Features
    • Added APIs cuptiActivityEnableDriverApi and cuptiActivityEnableRuntimeApi to limit the tracing of CUDA APIs that are of interest. This can help in reducing the CUDA API tracing overhead.
    • Added new field cigMode to communicate the CUDA in Graphics (CIG) mode associated with the CUDA context. The activity record CUpti_ActivityContext2 is deprecated and it is replaced by a new activity record CUpti_ActivityContext3. Enum CUpti_ContextCigMode describes the supported CIG modes.
    • Added new field numMultiprocessors in the context activity record to communicate the number of multiprocessors assigned to the green context.
    • Tracing is supported for MPS (Multi-Process Service) on Tegra platforms.
    • Obfuscated symbols are provided for Linux x86_64 platform, it helps us in speeding up the debug process for issues like crash, hang etc. See the NVIDIA CUDA Toolkit Symbol Server technical blog for information on how to use obfuscated symbols. Symbol server address is: https://cudatoolkit-symbols.nvidia.com/.
    Deprecated and dropped features
    • C Sampling Activity API from the header cupti_activity.h is deprecated for Volta and later GPU architectures and this will be removed in a future release. It is recommended to move to the PC Sampling API from the header cupti_pcsampling.h which is supported on Volta and later GPU architectures.
    • Removed support for the PowerPC (ppc64le) architecture.
    Resolved Issues
    • Fixed Unified memory profiling on Heterogeneous Memory Management (HMM) and Address Translation Service (ATS) systems.

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