Hi, Many people are using nocache (https://github.com/Feh/nocache) to prevent excessive buffer cache pollution by large rsync jobs. If you do so, you may have started to notice an *insane* slowdown on small-file workloads; turns out that nocache adds (IMHO unnecessary) fdatasync() calls after writing each file, making rsync excessively slow and a terrible I/O torture, especially on single disks. See: https://github.com/Feh/nocache/issues/22
To restore regular performance for rsync jobs with many small files, consider either fixing your nocache source or - much easier - additionally use libeatmydata to undo the fdatasync hit: https://www.flamingspork.com/projects/libeatmydata/ If you don't know what any of this means, carry on. ;) hope this helps someone. Holger -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
