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# Deploying Torch-TensorRT Programs

After compiling and saving Torch-TensorRT programs there is no longer a strict dependency on the full Torch-TensorRT library. All that is required to run a compiled program is the runtime. There are therfore a couple options to deploy your programs other than shipping the full Torch-TensorRT compiler with your applications.

## Torch-TensorRT package / libtorchtrt.so

Once a program is compiled, you run it using the standard PyTorch APIs. All that is required is that the package must be imported in python or linked in C++.

## Runtime Library

Distributed with the C++ distribution is `libtorchtrt_runtime.so` . This library only contains the components necessary to run Torch-TensorRT programs. Instead of linking `libtorchtrt.so` or importing `torch_tensorrt` you can link `libtorchtrt_runtime.so` in your deployment programs or use `DL_OPEN` or `LD_PRELOAD` . For python you can load the runtime with `torch.ops.load_library("libtorchtrt_runtime.so")` . You can then continue to use programs just as you would otherwise via PyTorch API.

Note

If you are using the standard distribution of PyTorch in Python on x86, likely you will need the pre-cxx11-abi variant of `libtorchtrt_runtime.so` , check Installation documentation for more details.

Note

If you are linking `libtorchtrt_runtime.so` , likely using the following flags will help `-Wl,--no-as-needed -ltorchtrt -Wl,--as-needed` as theres no direct symbol dependency to anything in the Torch-TensorRT runtime for most Torch-TensorRT runtime applications

An example of how to use `libtorchtrt_runtime.so` can be found here: https://github.com/NVIDIA/Torch-TensorRT/tree/master/examples/torchtrt_example

## Plugin Library

In the case you use Torch-TensorRT as a converter to a TensorRT engine and your engine uses plugins provided by Torch-TensorRT, Torch-TensorRT ships the library `libtorchtrt_plugins.so` which contains the implementation of the TensorRT plugins used by Torch-TensorRT during compilation. This library can be `DL_OPEN` or `LD_PRELOAD` similar to other TensorRT plugin libraries.