Thank you for your reply. "But, the capacity of storage devices is several orders of magnitude larger than memory and it even grows faster. Besides, we may want to apply it to systems with different requirement, for example, a huge scale mail system or the system holding many VM images."
I predicted this answer. I had caching in mind for personal desktops. I realize servers depend heavily on the raw IOPS values of hardware. Let me elaborate: If the OS was optimized so that it cached frequently-accessed and modified small files in ram, it would provide a much more responsive user experience. Maybe a fork of NILFS will support this? Or optional modes? Again, thank you for your answer. I hope NILFS advances quickly and becomes a solid, popular file system.
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