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Limit I/O vector count on Unix#75005

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Aug 5, 2020

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Commits on Aug 5, 2020

• Query maximum vector count on Linux and macOS

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• Memoize the I/O vector count limit

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• Reduce synchronization overhead of I/O vector count memoization

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• Rely only on POSIX semantics for I/O vector count

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• Add fallback for cfg(unix) targets that do not define libc::_SC_IOV_MAX.

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