> From: fio-owner@xxxxxxxxxxxxxxx [mailto:fio-owner@xxxxxxxxxxxxxxx] On > Behalf Of Josh Carter > I believe the effect you're seeing is that multiple threads will make the > IO look more random at the block device. Your configuration uses > sequential writes, but with numjobs=4 you'll have each job writing at a > different place in the device. I concur. Multiple jobs aimed at the same device will make the workload partially random. BTW, I omit the directory option and put the full path on the filename option. Gives clarity and seems more predictable (i.e. filename=/dev/sdh). I think directory is only useful if you're doing multiple files on a filesystem. (I also spawn separate fio instances instead of using numjobs.) z! -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
