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As you fill the memory with apps various block/filesystem caches are getting pushed out of the same memory. These caches are crucial for fast look up of files and other stuff. When there is no space for caches the kernel will try to look up all the information directly from the filesystem which is utterly slow and hence will cause high IO (more like a ...


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I am not an upstart expert, but I think, that jobs running as root are using disk preserved space (5% of partition space are preserved for root as default).


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I've found that sort seems to be the fastest uniq tool as shown here --> Fastest way to delete duplicates in large wordlist



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