[Fix] Lazy import of "psutil" in disco process pool #16752
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Prior to this PR, module "psutil" is imported at the top level of the disco process pool. The pool will try to kill all the processes at the time of destruction (when `__del__` is implicitly invoked). The `__del__` function eventually calls into a function that uses `pstuil`. But it is possible that the top-level `psutil` has already been released by Python, which leads to a KeyError as follows: ``` Exception ignored in: <function DiscoPopenWorker.__del__ at 0x7f2c922bfe20> Traceback (most recent call last): File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 67, in __del__ File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 81, in kill File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 162, in _kill_child_processes File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/__init__.py", line 323, in __init__ File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/__init__.py", line 353, in _init File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/_pslinux.py", line 1738, in __init__ File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/_common.py", line 864, in get_procfs_path KeyError: 'psutil' ``` This PR fixes the issue by lazily importing `psutil` when needed.
tqchen
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Prior to this PR, module "psutil" is imported at the top level of the disco process pool. The pool will try to kill all the processes at the time of destruction (when `__del__` is implicitly invoked). The `__del__` function eventually calls into a function that uses `pstuil`. But it is possible that the top-level `psutil` has already been released by Python, which leads to a KeyError as follows: ``` Exception ignored in: <function DiscoPopenWorker.__del__ at 0x7f2c922bfe20> Traceback (most recent call last): File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 67, in __del__ File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 81, in kill File "/home/ruihangl/Workspace/tvm/python/tvm/runtime/disco/process_pool.py", line 162, in _kill_child_processes File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/__init__.py", line 323, in __init__ File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/__init__.py", line 353, in _init File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/_pslinux.py", line 1738, in __init__ File "/home/ruihangl/Workspace/miniconda3/envs/python311/lib/python3.11/site-packages/psutil/_common.py", line 864, in get_procfs_path KeyError: 'psutil' ``` This PR fixes the issue by lazily importing `psutil` when needed.
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Prior to this PR, module "psutil" is imported at the top level of the disco process pool. The pool will try to kill all the processes at the time of destruction (when
__del__is implicitly invoked). The__del__function eventually calls into a function that usespstuil. But it is possible that the top-levelpsutilhas already been released by Python, which leads to a KeyError as follows:This PR fixes the issue by lazily importing
psutilwhen needed.