TraCR

TraCR (pronounced tracer) is a lightweight and user-friendly instrumentation library for tracing application behavior. It is designed to be easily toggled on or off at compile time, making it suitable for both development and production environments.

Features

• Lightweight integration with minimal overhead when disabled.
• Compile-time toggling using -DENABLE_INSTRUMENTATION.
• Optional debugging output with -DENABLE_DEBUG.
• Examples provided in the examples/ folder.
• Post-processing scripts for trace visualization in python_scripts/.
• PyTraCR for TraCR in python.
• env flag use export DISABLE_TRACR=1 to disable the traces.

Instrumentation Control

• -DENABLE_INSTRUMENTATION to enable instrumentation.
  • If undefined, all instrumentation calls become void (i.e. no performance impact).
• -DENABLE_DEBUG to enable debugging output from TraCR.

Example Output

A sample trace generated using TraCR is shown below:

Installation

Step 1: Install Ovni (Dependency)

Clone this repo recursively as TraCR relies on ovni as its core instrumentation backend. To install ovni:

git clone --recurse-submodules https://github.com/Algebraic-Programming/TraCR.git
cd tracr

export prefix=$HOME/library/ovni  # or your preferred installation path

mkdir -p extern/ovni/build
pushd extern/ovni/build
cmake .. -DCMAKE_INSTALL_PREFIX=$prefix
make -j$(nproc)
make install
popd

Add the following to your .bashrc to make ovni accessible:

# Ovni environment setup
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$HOME/library/ovni/lib/pkgconfig
export PATH=$HOME/library/ovni/bin:$PATH

To verify the installation, navigate to the build directory:

cd tracr/extern/ovni/build
make test

Step 2: Install TraCR

At the moment, there is no standalone installation process for TraCR.
However, the recommended way is to use it as a Meson subproject.
To integrate it, add the following to your meson.build file:

# Add TraCR as a subproject
InstrumentationProject = subproject('tracr', required: true)
InstrumentationBuildDep = InstrumentationProject.get_variable('InstrumentationBuildDep')
<your_dependencies> += InstrumentationBuildDep

# Enable instrumentation
add_project_arguments('-DENABLE_INSTRUMENTATION', language: 'cpp')

# Uncomment the following line to enable debug prints from TraCR
# add_project_arguments('-DENABLE_DEBUG', language: 'cpp')

or in CMake something like this:

# Add the TraCR subproject
add_subdirectory(external/tracr)

# Enable instrumentation
add_definitions(-DENABLE_INSTRUMENTATION)

# Optional: Enable debug prints
# add_definitions(-DENABLE_DEBUG)

# Link your target against the TraCR library
target_link_libraries(your_target PRIVATE tracr_instrumentation)

But then you would need to add a CMakeLists.txt in TraCR.

Trace Visualization with Paraver

The generated traces are stored in a folder called ovni/. This one have to be emulated via ovniemu ovni/.

To visualize traces produced by TraCR, install Paraver:

wget https://ftp.tools.bsc.es/wxparaver/wxparaver-4.11.4-Linux_x86_64.tar.bz2

Unpack and follow the installation instructions from Paraver’s documentation.

PyTraCR

PyTraCR is the python version of TraCR. For that, one has to run meson setup .. -DbuildPyTraCR=true and add PYTHONPATH=<tracr_repo>/build/include/pytracr/ in his .bashrc.

License

Copyright 2025 Huawei Technologies Co., Ltd.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.