Re: get err 5

[Sitsofe Wheeler <sitsofe@gmail.com>]

On 1 August 2018 at 06:31, آرش خاوری راد <arash.khavary@gmail.com> wrote:
> Hi i got this error when test FIO sequential write every time, in sequential
> read, random read, random write not got this.
>
> my Linux distro is CentOS Linux release 7.5.1804 (Core)
> and my kernel version is 3.10.0-327.10.1.el7.x86_64
>
> My output is:
>
> job1: (g=0): rw=write, bs=(R) 4096KiB-4096KiB, (W) 4096KiB-4096KiB, (T)
> 4096KiB-4096KiB, ioengine=libaio, iodepth=16

[snip]

>
> My parameter is :
>
>
> [global]
> readwrite=write
> blocksize=4m
> direct=1

[snip]

>
> [job1]
> numjobs=3
> filename=/dev/sdb
>
>
> [job2]
> numjobs=2
> filename=/dev/sdc
>
>
> [job3]
> numjobs=3
> filename=/dev/sdd
>
>
> [job4]
> numjobs=3
> filename=/dev/sde
>
>
> [job5]
> numjobs=2
> filename=/dev/sdf
>
>
> [job6]
> numjobs=3
> filename=/dev/sdg

[snip]

> Why get err 5?
> thanks

So you have 6 separate  jobs and the jobs specify numjobs. If we add
all the numjobs together we get 16. You specify a giant blocksize (4
megabytes) which is strangely big unless you are doing unless you're
doing extreme NVMe testing. You also specify an iodepth of 16. So 16 *
16 * 4 = 1024 megabytes of I/O buffers - are you sure you're not
causing yourself to hit memory issues?

-- 
Sitsofe | http://sucs.org/~sits/