libqcperf

A lightweight, open-source performance profiling library for Qualcomm chipsets.

Table of Contents

• libqcperf
  • Table of Contents
  • Introduction
  • Framework Features
    • Core Capabilities
    • Available Backends
    • Technical Foundation
  • Build System
  • Compilation Instructions
    • Linux ARM64
      • Command Line
      • CMake Presets
    • Windows ARM64
  • Design Diagrams
    • Sequence Diagram
    • Flow Diagram
    • Backend Architecture
  • Documentation for backend developers
  • Contributing
  • Security
  • License

Introduction

libqcperf is a performance profiling library designed for Qualcomm chipsets across different SoCs and subsystems. It provides a unified framework for monitoring and analyzing system performance metrics in real-time, enabling developers to optimize their applications for Qualcomm platforms.

The library is designed with modularity and extensibility in mind, featuring a core API that interfaces with multiple specialized backends. Each backend focuses on specific performance aspects such as thermal monitoring, memory bandwidth, or power consumption. This architecture allows developers to collect precisely the metrics they need without unnecessary overhead.

Originally inspired by the Qualcomm Profiler tool, libqcperf is now available as an open-source project, empowering the developer community to build from source, customize functionality, and extend capabilities through new backends or integrations with other tools.

Framework Features

Core Capabilities

• Modular backend architecture for different monitoring needs
• Configurable sampling and streaming rates
• Dynamic capability discovery
• Cross-platform support (Windows and Linux)
• Asynchronous data collection via background threads
• Non-blocking callback-based data delivery

Available Backends

Backend	OS / Platform	-DBACKENDS Flag	Compile Definition	Description	Metrics & Configuration Reference
Thermal Backend	Windows on Snapdragon (WoS)	THERMAL	QCPERF_ENABLED_WOS_THERMAL	Monitors temperature and passive cooling metrics across 22 thermal zones	wos_thermal_info.h
Power Backend	Windows on Snapdragon (WoS)	POWER	QCPERF_ENABLED_WOS_POWER	Measures power consumption across various system components	wos_power_backend_info.h
Linux CPU Backend	Qcom Linux	CPU	QCPERF_ENABLED_QCOM_LINUX_CPU	Monitors CPU load, frequency, effective utilization, steal time, and DCVS frequency limit per core (up to 18 cores)	qcom_linux_cpu_info.h
DSP NPU Backend	Qcom Linux	NPU	QCPERF_ENABLED_QCOM_LINUX_NPU	Monitors Neural Processing Unit (NPU) performance metrics including Q6 utilization, Q6 clock frequency, HVX utilization, and HMX utilization	qcom_dsp_npu_info.h
Dummy Backend	All	DUMMY	QCPERF_ENABLED_DUMMY	Reference implementation for testing and development	dummy_info.h

Note: Each backend's info.h file contains detailed information about supported capability, metrics, sampling rates, and streaming rates.

Technical Foundation

• WoS backends rely on publicly available Windows driver APIs (ETW, IOCTL)
• Linux backends rely on standard Linux kernel interfaces (sysfs, procfs)
• Comprehensive error handling and resource management
• Thread-safe operations for multi-threaded applications

Build System

• CMake
• Compiler
  • Windows on Snapdragon - Visual Studio 2022
  • Linux ARM64 - ARM GNU Toolchain (aarch64-none-linux-gnu-gcc)

Compilation Instructions

Linux ARM64

To cross-compile the library for Linux on ARM64 platforms, you need the ARM GNU Toolchain (arm-gnu-toolchain-**.*.rel1-x86_64-aarch64-none-linux-gnu).

Command Line

# Set the toolchain path (adjust to your installation directory)
export AARCH64_TOOLCHAIN_PATH=/path/to/arm-gnu-toolchain

# Configure and generate build files
cmake -S qcperf -B build-linux-aarch64-release \
    -DTARGET_ARCH=linux-aarch64 \
    -DCMAKE_BUILD_TYPE=Release \
    -DProjectVersion="0.1.0.0" \
    -DBACKENDS="CPU;NPU;DUMMY" \
    -DBUILD_SHARED=OFF

# Compile the project
cmake --build build-linux-aarch64-release

Flag	Value	Description
-S qcperf	qcperf	Source directory containing the top-level CMakeLists.txt
-B build-linux-aarch64-release	build-linux-aarch64-release	Output directory for generated build files and compiled artifacts
-DTARGET_ARCH	linux-aarch64	Selects the cross-compilation toolchain for Linux ARM64; requires AARCH64_TOOLCHAIN_PATH to be set
-DCMAKE_BUILD_TYPE	Release / Debug	Build type: Release produces an optimized binary; Debug includes debug symbols
-DProjectVersion	"0.1.0.0"	Sets the library version string embedded in the build
-DBACKENDS	"CPU;NPU;DUMMY"	Semicolon-separated list of backends to compile (case-insensitive); omit this flag to compile all backends supported on the target platform
-DBUILD_SHARED	OFF / ON	OFF builds a static library (.a); ON builds a shared library (.so)

Note: Only backends supported on the target platform are compiled even if listed explicitly (e.g., specifying power on Linux ARM64 will be silently skipped with a warning).

CMake Presets

The build is configured via CMake presets defined in qcperf/CMakePresets.json (shared base) and qcperf/CMakeUserPresets.json (user-local overrides).

Toolchain path — priority order:

1. Environment variable AARCH64_TOOLCHAIN_PATH (takes precedence if set)
2. Value defined in the linux-aarch64-user-base hidden preset in qcperf/CMakeUserPresets.json (fallback default)

To change the toolchain path or project version, edit only the linux-aarch64-user-base preset in qcperf/CMakeUserPresets.json — all other presets inherit from it automatically.

Preset	Build Type	Library Type	Output Directory
linux-aarch64-debug	Debug	Static	build-linux-aarch64-debug/
linux-aarch64-release	Release	Static	build-linux-aarch64-release/
linux-aarch64-debug-shared	Debug	Shared (.so)	build-linux-aarch64-debug-shared/
linux-aarch64-release-shared	Release	Shared (.so)	build-linux-aarch64-release-shared/

e.g. for a debug build:

# Configure
cd qcperf
cmake --preset linux-aarch64-debug

# Compile the project
cmake --build --preset linux-aarch64-debug

e.g. for a release shared library build:

# Configure
cd qcperf
cmake --preset linux-aarch64-release-shared

# Compile the project
cmake --build --preset linux-aarch64-release-shared

Windows ARM64

To build the library for Windows on ARM64 platforms:

# Clone the repository
git clone https://github.com/qualcomm/libqcperf.git
cd libqcperf

# Clone third-party dependencies
git submodule update --init --recursive

# Sample test app path
qcperf\test_app

# Compilation for Windows ARM64
## Generate build files
cmake -B <build_dir_path> -G "Visual Studio 17 2022" -A ARM64 -DProjectVersion="0.1.0.0"

## Compile the project
cmake --build <build_dir_path> --config Release

Design Diagrams

Sequence Diagram

• QcPerf Sequence Diagram

Flow Diagram

• QcPerf Flow Diagram

Backend Architecture

• QcPerf Backend Architecture

Documentation for backend developers

For detailed information about backend development, coding standards, and extending the library, please refer to the DEVELOPMENT-GUIDE.md file in the root of the repository.

Contributing

We welcome contributions to libqcperf! Please read our CONTRIBUTING.md file for details on our code of conduct and the process for submitting pull requests.

Security

For information on reporting security vulnerabilities, please see our SECURITY.md file.

License

This project is licensed under the BSD 3-Clause License. See the LICENSE.txt file for full details.

Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.