On Thu, 2022-03-10 at 19:47 -0400, George N. White III wrote: > > Oops. It actually has "compress=zstd:1" in the fstab line. > > > > Apologies. That completely invalidates the numbers. > > > > Not completely invalid, they still say something about a real-world > use > case, (I work with optical remote sensing where many images have big > blocks of "missing" data codes, e.g., clouds) but the interpretation > changes. We have been using netcdf4 files with internal > compression, > but now I'm motivated to compare without compression on btrfs for > "scratch" > files that don't move on a network. I'm calling it invalid because the data is a stream of zeroes, i.e. it's pretty much maximally compressible. This might be more realistic, using /dev/urandom: $ time dd if=/dev/urandom bs=1M count=23000 of=Big 23000+0 records in 23000+0 records out 24117248000 bytes (24 GB, 22 GiB) copied, 81.9688 s, 294 MB/s real 1m22.106s user 0m0.040s sys 1m21.753s poc _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
