On Wed, 2022-03-09 at 11:25 -0800, Samuel Sieb wrote: > On 3/9/22 02:44, Patrick O'Callaghan wrote: > > Thanks for the detailed info. My current SSD is a Samsung 860 EVO > > (2TB) > > so for comparison I did this: > > > > $ time dd if=/dev/zero bs=1G count=23 of=Big > > 23+0 records in > > 23+0 records out > > 24696061952 bytes (25 GB, 23 GiB) copied, 14.9873 s, 1.6 GB/s > > > > real 0m15.087s > > user 0m0.000s > > sys 0m14.640s > > > > However that's clearly not a reflection of actual I/O speed as the > > writes will have been cached. > > You can use "conv=fdatasync" to make sure all data is written before > giving the final result.
Didn't seem to make a difference: $ time dd if=/dev/zero bs=1G count=23 conv=fdatasync of=Big 23+0 records in 23+0 records out 24696061952 bytes (25 GB, 23 GiB) copied, 15.3153 s, 1.6 GB/s real 0m15.375s user 0m0.001s sys 0m14.932s poc _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org 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@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
