I have used flock for years without any issues. https://www.unix.com/man-page/centos/1/flock/ Thanks, Matt. On 9/3/19 6:39 am, Dattatec Mirrors wrote: > El Viernes 08/03/2019 a las 16:09, David Richardson escribió: >> I'm quoted! I'm famous! :) > With reason, your flock advise was thoroughly implemented in our > infrastructure :) > > And lately I (almost accidentally) realised the good effects of lowering > vm.vfs_cache_pressure, reinforced after re-reading your email :) > >> There's two parts to what was quoted below: >> >> 1) Use flock to make sure you only have one update running. It'll do the >> right thing if something happens and the job exits abnormally. Someone >> else has already written a tool, so use their work instead of >> reinventing it yourself. >> >> 2) Tune vm.vfs_cache_pressure. In my experience, this makes the operations >> where you care about interactive performance (ls, du, find, rsync >> updates from upstream) MUCH faster, and has little impact on >> bulk-transfer performance. >> >> Thanks, >> DR >