khushalps
70a020f9b2
git-subtree-dir: utils_v2 git-subtree-split: 6c32fa9a3d50c06a5487783423147b2bf9ce7549
105 lines
4.7 KiB
Python
105 lines
4.7 KiB
Python
"""
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AUTHOR:
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Khushal P Soonderji
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DATE:
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Wednesday, 18th Dec., 2024
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OBJECTIVE:
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To set the CPU affinity of your process. This makes the process prefer a specific set of CPU cores over others.
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Apparently, this makes cache access faster and provides other optimizations. Here's what ChatGPT had to say:
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"Setting CPU affinity in Python allows controlling which CPU cores a process or thread runs on,
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optimizing performance by improving cache locality, reducing context switching, and ensuring efficient resource
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allocation. It's beneficial in high-performance, real-time, and NUMA systems but may add overhead in general
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tasks." - ChatGPT
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REFERENCES:
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N/A
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DOWNLOADS:
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N/A
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"""
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# *****************************************************************************************************************
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# ***** ****
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# *** IMPORT ***
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# ***** ****
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# *****************************************************************************************************************
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# To make sibling directories accessible for imports:
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import sys
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sys.path.append(".")
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sys.path.append("..")
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# System-level activities:
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import psutil
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# *****************************************************************************************************************
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# ***** ****
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# *** MACROS / ONE-TIME INIT ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** VARIABLES ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** FUNCTIONS ***
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# ***** ****
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# *****************************************************************************************************************
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def set_affinity(requested_cpus: list):
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"""
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Sets the affinity of the current process to certain CPUs so that performance is boosted. The main factors that
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contribute to gains are cache-locality, reduced context switching, and effective resource management.
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:param requested_cpus: The array of integers of which CPU cores are preferred.
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:return: None.
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"""
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# Get the number of available CPUs:
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num_cpus = psutil.cpu_count()
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# Wrap around logic for when a core has been request that doesn't exist on this machine.
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# This is useful in cases like developing on a local machine with just 4 cores, but your server has dozens of cores.
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valid_cpus = [cpu % num_cpus for cpu in requested_cpus]
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# Set the CPU affinity:
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psutil.Process().cpu_affinity(valid_cpus)
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# *****************************************************************************************************************
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# ***** ****
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# *** MAIN PROGRAM ***
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# ***** ****
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# *****************************************************************************************************************
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if __name__ == "__main__":
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pass
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