> -----Original Message----- > From: fio-owner@xxxxxxxxxxxxxxx <fio-owner@xxxxxxxxxxxxxxx> On Behalf Of > Mauricio Tavares > Sent: Wednesday, January 15, 2020 7:51 AM > To: fio@xxxxxxxxxxxxxxx > Subject: CPUs, threads, and speed > > Let's say I have a config file to preload drive that looks like this (stolen from > https://github.com/intel/fiovisualizer/blob/master/Workloads/Precondition/fill > _4KRandom_NVMe.ini) > > [global] > name=4k random write 4 ios in the queue in 32 queues > filename=/dev/nvme0n1 > ioengine=libaio > direct=1 > bs=4k > rw=randwrite > iodepth=4 > numjobs=32 > buffered=0 > size=100% > loops=2 > randrepeat=0 > norandommap > refill_buffers > > [job1] > > That is taking a ton of time, like days to go. Is there anything I can do to speed it > up? When you say preload, do you just want to write in the full capacity of the drive? A sequential workload with larger blocks will be faster, like: [global] ioengine=libaio thread=1 direct=1 bs=128k rw=write numjobs=1 iodepth=128 size=100% loops=2 [job00] filename=/dev/nvme0n1 Or if you have a use case where you specifically want to write it in with 4K blocks, you could probably increase your queue depth way beyond 4 and see improvement in performance, and you probably don't want to specify norandommap if you're trying to hit every block on the device. -Joe
