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[Feature Request] Implement dynamically sized CPU sets for linux. #21241

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@hpcpony

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Describe the feature request

Implement dynamically sized CPU sets in onnxruntime/core/platform/posix/env.cc (ThreadMain) so that systems with more than 1024 cores are handled properly. The linux man page for cpu_set describes the necessary calls: CPU_ALLOC, CPU_ALLOC_SIZE, CPU_FREE, CPU_ZERO_S, CPU_SET_S...

Describe scenario use case

Using any systems with more than 1024 cores.

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