Hi. On Wed, Jun 17, 2020 at 05:54:51PM -0400, Michael Stone wrote: > On Wed, Jun 17, 2020 at 11:45:53PM +0300, Reco wrote: > > Long story short, if you need a primitive I/O benchmark, you're better > > with both dsync and nocache. > > Not unless that's your actual workload, IMO. Almost nothing does sync i/o;
Almost everything does (see my previous e-mails). No everything does it with O_DSYNC, that's true. Although if it uses sqlite - chances are it does it with O_DSYNC. > simply using conv=fdatasync to make sure that the cache is flushed before > exiting > is going to be more representative. If you're answering the question "how fast is my programs are going to write there" - sure. If you're answering the question "how fast my drive(s) actually is(are)" - nope, you need O_DSYNC. Reco
