BKMs to check whether mkl or mkldnn is enabled on PyTorch

pytorch_check_mkl_mkldnn.md

BKMs to check whether mkl or mkldnn is enabled on PyTorch

PyTorch can be installed via different channels: conda, pip, docker, source code...

By default, mkl and mkl-dnn are enabled; But this might not always be true, so it is still useful to learn how to check this by yourself:

1. How to check whether mkl is enabled?

### check where your torch is installed
python -c 'import torch; print(torch.__path__)'

On my machine, it points to the conda env pytorch-cuda which i created specifically for cuda runs...

['/home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch']

Next,

cd /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch
cd lib
ldd libtorch.so

This will give all the .so that PyTorch compiled against...

linux-vdso.so.1 =>  (0x00007ffe5ef06000)
libgomp.so.1 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libgomp.so.1 (0x00007f0216544000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f0216312000)
libnvToolsExt.so.1 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libnvToolsExt.so.1 (0x00007f0216108000)
libcudart.so.10.0 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libcudart.so.10.0 (0x00007f0215e8b000)
libcaffe2.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./libcaffe2.so (0x00007f0212c54000)
libcaffe2_gpu.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./libcaffe2_gpu.so (0x00007f01e71c7000)
libc10_cuda.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./libc10_cuda.so (0x00007f01e6fa2000)
libc10.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./libc10.so (0x00007f01e6d5e000)
libm.so.6 => /lib64/libm.so.6 (0x00007f01e6a5c000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f01e6858000)
libstdc++.so.6 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libstdc++.so.6 (0x00007f01e6716000)
libgcc_s.so.1 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libgcc_s.so.1 (0x00007f01e6702000)
libc.so.6 => /lib64/libc.so.6 (0x00007f01e633f000)
/lib64/ld-linux-x86-64.so.2 (0x000056504e07a000)
librt.so.1 => /lib64/librt.so.1 (0x00007f01e6136000)
libmkl_intel_lp64.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libmkl_intel_lp64.so (0x00007f01e55e8000)
libmkl_gnu_thread.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libmkl_gnu_thread.so (0x00007f01e3d93000)
libmkl_core.so => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libmkl_core.so (0x00007f01dfc07000)
libcusparse.so.10.0 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libcusparse.so.10.0 (0x00007f01dc198000)
libcurand.so.10.0 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libcurand.so.10.0 (0x00007f01d8030000)
libcufft.so.10.0 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libcufft.so.10.0 (0x00007f01d1b79000)
libcublas.so.10.0 => /home/mingfeim/anaconda3/envs/pytorch-cuda/lib/python3.7/site-packages/torch/lib/./../../../../libcublas.so.10.0 (0x00007f01cd5e0000)

In case you see libmkl_intel_lp64.so, libmkl_gnu_thread.so, libmkl_core.so, your PyTorch has mkl; otherwise not.

Also this is the method to check which mkl is being used in case you have multiple versions installed on your machine, which is particularly useful for intel employees...

2. How to check whether mkl-dnn is enabled?

python -c 'import torch; a = torch.randn(10); print(a.to_mkldnn().layout)'

On my machine, this will print the tensor's layout which is _mkldnn, which indicates pytorch is compiled against mkl-dnn

torch._mkldnn

In case you have no mkl-dnn enabled, you will receive a RuntimeError from to_mkldnn()...

Notes:

PyTorch is now shipped with gomp by default...In case you want to use iomp, follow use-intel-openmp-library.

@smeetdc, v1.7 doesn't have MkldnnTensor training feature (only the forward is enabled), 1.10 has full set of training support for MkldnnTensor. I'm afraid v1.7 is not suitable for your request and it is a dead end.

For inference you need to convert both the input and the model, as below

from torch.utils import mkldnn as mkldnn_utils
### this will recursively convert `weight` and `bias` to MkldnnTensor and do weight prepacking
model = mkldnn_utils.to_mkldnn(model)

For training, only need to convert input (the weight is kept in plain CPU tensor layout, not Mkldnn layout)

Hi @mingfeima, I see. I will work with PyTorch v1.10 to use Mkldnn during training.
Thanks a lot!