Run du with ionice

[dims]

Let us run du with idle io priority

Will this help? mentioned by @meeee in kubernetes/kubernetes#61999 (comment)

[dims]

/assign @dashpole

[dashpole]

Thanks for this @dims!

[dashpole]

Should we do the same for find? Does this require any additional packages in our Dockerfile?

[dims]

@dashpole i tried a few public latest images and they all seemed to have ionice

docker run -it ubuntu bash
docker run -it busybox sh
docker run -it fedora sh
docker run -it debian sh

Also tried our hyperkube

docker run -it k8s.gcr.io/hyperkube-amd64:v1.10.2 sh

[dims]

while looking at the various issues filed, i did not see find causing issue, so may be we should wait to do that?

[dashpole]

ok, great.

[dashpole]

They are usually lumped together. I did a performance analysis at one point and found that find used about 1/2 the CPU of du, but i'm not sure about the disk io usage of find.

[dims]

aha! so we could do at least "nice" on the find command