FIO IO units block size setting function

FIO IO units block size setting function

[vmokric]

Hello,

can someone point me to FIO function which performs IO units block size 
settings? If I, e.g. pass "bs=8k", where does it actually ends up?

I have searched ioctl commands, but couldn't figure out actual function.

I would really appreciate any help, since I need some guidelines within 
perplexed world of Linux IO system.

Regards

Re: FIO IO units block size setting function

[Andrey Kuzmin]

On Fri, Oct 30, 2015 at 12:48 PM, vmokric <vojislav.mokric@htec.rs> wrote:
> Hello,
>
> can someone point me to FIO function which performs IO units block size
> settings? If I, e.g. pass "bs=8k", where does it actually ends up?

It goes through the parser into setting up the per-process/thread
I/O pattern, look under struct thread_options definition.

>
> I have searched ioctl commands, but couldn't figure out actual function.
>

ioctl has more or less nothing to do with this as it pops up only when fio
deals with a block device and wants to learn its size (look under filesetup.c
and os/os-linux.h).

Regards,
Andrey

> I would really appreciate any help, since I need some guidelines within
> perplexed world of Linux IO system.
>
> Regards
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Re: FIO IO units block size setting function

[vmokric]

Thanks Andrey,
this points me to right direction.

Regards,
Vojislav