vmtouch

Diagnose and control file system cache usage on your system

brewmacoslinux

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Portable file system cache diagnostics and control

vmtouch

Show which files are cached in memory for a directory$ vmtouch -v /path/to/directory

Lock a file into memory (prevent eviction from cache)$ vmtouch -l /path/to/file

Evict a file from memory cache$ vmtouch -e /path/to/file