[Qemu-devel] Question about posixaio thread number.

[Gui Jianfeng]

Hi Anthony,

I started a guest with cache=none and aio=threads

When i did some io tests in Guest say dd like
dd if=/dev/zero oflag=direct of=/mnt/sdb1/date.img bs=4k count=262114

qemu will start one or several threads to perform IO requests.

It seems qemu makes use of its own posixaio. I'm wondering how qemu
decides how many threads should be created to perform io operation?

Thanks,
Gui