Introduction¶

Zephyr Profiling Library (ZPL), or Zephelin for short, is a library which enables capturing and reporting runtime performance metrics, for the profiling and detailed analysis of Zephyr applications, with a special focus on applications running AI/ML inference workloads.

This documentation describes the following aspects of Zephelin and the associated projects:

• Zephelin - provides general information on Zephelin repository, describes how to build, test and use the profiling middleware

• Zephelin configuration - describes build-time and runtime configuration of Zephelin library

• Memory profiling - describes memory profiling, along with memory events

• Tracing code scopes - describes the use of tracing code scopes

• Trace capture debug interface - provides information on the debug interface for capturing traces

• Instrumentation - shows how to use instrumentation subsystem with Zephelin

• CTF to TEF conversion - describes how traces are converted and processed

• Adding support for new AI inference libraries - depicts how to track a new runtime

• Zephelin Trace Viewer - describes the tool for trace visualization and provides sample applications for various tracing features

• Zephelin usage examples - aggregates and describes various example applications present in the project

• Zephelin’s developer guidelines - summarizes and links resources regarding development of Zephelin