[Misc] Move find_loaded_library to platform_aware_utils.py

[houseroad]

find_loaded_library is a platform specific implementation, so create "platform_aware_utils.py". For different platform (such as using PAR to pack the binary), we can create our own version of "platform_aware_utils.py" to override such platform aware utility functions.

[github-actions]

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[youkaichao]

The change of separating the function makes sense to me.

in vllm, platform mainly indicates accelerators, e.g. cuda, rocm, xpu, etc.

can you provide more intuitive names to them?

maybe you can provide your implementation of find_loaded_library , and we can see how to create proper abstraction for it.

[houseroad]

How about deployment_aware_utils.py instead? Our internal changes can be found in https://github.com/vllm-project/vllm/pull/12129/files. So far two things to change: 1) libcudart path, 2) PYTHONPATH due to PAR packing method.

[youkaichao]

In this case, I think we can have VLLM_CUDART_SO_PATH env var, similar to how we handle the VLLM_NCCL_SO_PATH. see

vllm/vllm/envs.py

Line 191 in 9691255

"VLLM_NCCL_SO_PATH":

[houseroad]

I see, I can have similar way to handle VLLM_CUDART_SO_PATH. How about the solution for subprocess.run? I was about to have a wrapper of subprocess_run to pass in the PYTHONPATH internally. Any suggestion on that?

[youkaichao]

How about the solution for subprocess.run?

commented at #12129 (comment)