Re: [General question] on iodepth Combined with numjobs

[Vincent Fu <vincentfu@gmail.com>]

On 9/30/24 04:05, Jigao Luo wrote:
> Hi everyone,
> 
> I have a quick question to confirm the behavior of *iodepth* when 
> combined with *numjobs* in FIO. Based on the FIO script below, is the 
> iodepth set to 256 for the device /dev/nvme0n1?
>  From my understanding, iodepth value is set to 128 for each numjobs, 
> and since there are 2 numjobs for this device, the total depth would be 
> 128 * 2 = 256 for /dev/nvme0n1. Is this interpretation correct?
> 
> Thanks
> 
> 
> [global]
> ioengine=io_uring
> thread=1
> direct=1
> percentile_list=50:90:99:99.5:99.9:99.99:99.999
> group_reporting=1
> norandommap=1
> rw=randread
> bs=4k
> time_based=1
> runtime=20
> 
> [filename0]
> filename=Nvme0n1
> iodepth=128
> numjobs=2
> cpus_allowed=18,19
> numa_mem_policy=prefer:1
> 
> 

Yes, that's right. numjobs creates the specified number of jobs each 
with the same set of options. So you will have two jobs each with an 
iodepth of 128.

Vincent