what is the unit for usr_cpu and sys_cpu in fio3.16? Inbox x

what is the unit for usr_cpu and sys_cpu in fio3.16? Inbox x

[Shridhar Sahukar]

Hello,

I have a bunch of benchmark results from fio-3.16 in json format and I
am unable to find the units for sys_cpu and usr_cpu fields.

For example, the output shows

"sys_cpu": 1.560156
"usr_cpu": 0.420997

Is this in seconds?

Thanks,
Shridhar

Re: what is the unit for usr_cpu and sys_cpu in fio3.16? Inbox x

[Sitsofe Wheeler]

Hi,

On Fri, 10 Apr 2020 at 04:34, Shridhar Sahukar
<shridhar.sahukar2@gmail.com> wrote:
>
> Hello,
>
> I have a bunch of benchmark results from fio-3.16 in json format and I
> am unable to find the units for sys_cpu and usr_cpu fields.
>
> For example, the output shows
>
> "sys_cpu": 1.560156
> "usr_cpu": 0.420997
>
> Is this in seconds?

No it should be a percentage (of the total run time). From
https://github.com/axboe/fio/blob/839f607b5771081e96942977a1ff9f1b24b77bca/stat.c#L1089
:

usr_cpu = (double) ts->usr_time * 100 / runt;

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

Re: what is the unit for usr_cpu and sys_cpu in fio3.16? Inbox x

[Shridhar Sahukar]

Hi,

Thanks for the quick response.

In the trial run where I got values "sys_cpu": 1.560156 and "usr_cpu":
0.420997, the total run time was 10mins, so does it mean that fio used
about ~2% CPU (or 12 seconds) - user and system combined?

Is it 2% of one single Core? Or 2% of all the CPU available?

Regards,
Shridhar


On Fri, 10 Apr 2020 at 00:27, Sitsofe Wheeler <sitsofe@gmail.com> wrote:
>
> Hi,
>
> On Fri, 10 Apr 2020 at 04:34, Shridhar Sahukar
> <shridhar.sahukar2@gmail.com> wrote:
> >
> > Hello,
> >
> > I have a bunch of benchmark results from fio-3.16 in json format and I
> > am unable to find the units for sys_cpu and usr_cpu fields.
> >
> > For example, the output shows
> >
> > "sys_cpu": 1.560156
> > "usr_cpu": 0.420997
> >
> > Is this in seconds?
>
> No it should be a percentage (of the total run time). From
> https://github.com/axboe/fio/blob/839f607b5771081e96942977a1ff9f1b24b77bca/stat.c#L1089
> :
>
> usr_cpu = (double) ts->usr_time * 100 / runt;
>
> --
> Sitsofe | http://sucs.org/~sits/