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nocache - don't use Linux page cache on given command nocache [-n <n>] command [argument...] The `nocache` tool tries to minimize the effect an application has on the Linux file system cache. This is done by intercepting the `open` and `close` system calls and calling `posix_fadvise` with the `POSIX_FADV_DONTNEED` parameter. Because the library remembers which pages (ie., 4K-blocks of the file) were already in file system cache when the file was opened, these will not be marked as "don't need", because other applications might need that, although they are not actively used (think: hot standby). If your use case is a backup processes that should not interfere with the present state of the cache too much, consider using cgroups instead. They're much cleaner and carry less overhead than this tool. For example, if your system uses systemd, you can do: systemd-run --scope --property=MemoryLimit=500M -- backup command For more info, see the README on https://github.com/Feh/nocache Source file: nocache.1.en.gz (from nocache 1.2-0.1 ) Source last updated: 2024-07-07T11:44:09Z Converted to HTML: 2026-06-25T06:48:07Z debiman df2f1b6, see github.com/Debian/debiman . Found a problem? See the FAQ .