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並前往https://www.quora.com/How-much-CPU-time-is-needed-to-check-if-a-file-exists

How much CPU time is needed to check if a file exists? - Quora

It's not the CPU time that's gonna kill you, it's the file system access.... If on UNIX, you stat() the file to see if it exists. That's a drop to kernel ...

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