Support flag --no-mmap-output-file#1215
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mati865
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With sufficient amount of threads, this flag is an improvement for BTRFS, EXT4, F2FS and XFS, and a regression for tmpfs and ZFS.
Unless --update-in-place is also passed, that flag + mmap is the best everywhere except BTRFS.
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mati865
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Oct 16, 2025
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