https://github.com/openzfs/zfs/issues/11140
Briefly: Flatpak uses fsync extensively. For reasons nobody is entirely sure about, this causes ZFS to thrash *hard* which I discovered earlier this week as I finally got around to switching my Calibre install from Debian's packages (which are woefully out of date). A flatpak installation that would take at most about 30 seconds on Btrfs or ext4 takes an hour on ZFS. For me at least, the workaround is to bracket flatpak install/upgrade commands with disabling and enabling dataset sync: sudo zfs set sync=disabled zfsroot/zfs/home flatpak upgrade sudo zfs set sync=standard zfsroot/zfs/home -- \m/ (--) \m/ _______________________________________________ Discuss mailing list Discuss@lists.blu.org https://lists.blu.org/mailman/listinfo/discuss
