# Libkineto

Libkineto is an in-process profiling library, part of the Kineto performance
tools project.

The library provides a way to collect GPU traces and metrics from the host
process, either via the library public API or by sending a signal, if enabled.

Currently only NVIDIA GPUs are supported.

## Build Notes
Libkineto uses the standard CMAKE-based build flow.

### Dependencies
Libkineto requires gcc 5+ and:

- NVIDIA CUPTI: used to collect traces and metrics from NVIDIA GPUs.
- fmt: used for its convenient and lightweight string formatting functionality.
- googletest: required to build and run Kineto's tests.
  - **googletest is not required** if you don't want to run Kineto tests.
By default, building of tests is **on**. Turn it off by setting `KINETO_BUILD_TESTS` to **off**.

You can download [NVIDIA CUPTI][1], [fmt][2], [googletest][3] and set
`CUDA_SOURCE_DIR`, `FMT_SOURCE_DIR`, `GOOGLETEST_SOURCE_DIR` respectively for
cmake to find these libraries. If the fmt and googletest variables are not set, cmake will
build the git submodules found in the `third_party` directory.
If `CUDA_SOURCE_DIR` is not set, libkineto will fail to build.

### Building Libkineto

```
# Check out repo and sub modules
git clone --recursive https://github.com/pytorch/kineto.git
# Build libkineto with cmake
cd kineto/libkineto
mkdir build && cd build
cmake ..
make
```

To run the tests after building libkineto (if tests are built), use the following
command:
```
make test
```

### Installing Libkineto
```
make install
```

## How Libkineto works
We will provide a high-level overview, design philosophy and brief descriptions of various
parts of Libkineto in upcoming blogs.

## Full documentation
We strive to keep our source files readable. The best and up-to-date
documentation is available in the source files.

## License
Libkineto is BSD licensed, as detailed in the [LICENSE](../LICENSE) file.

[1]:https://developer.nvidia.com/CUPTI-CTK10_2
[2]:https://github.com/fmt
[3]:https://github.com/google/googletest