Hi, Thanks for the input. Regarding docker we are building the docker image and we are using the same image for all nodes so should they not be identical when the nodes start the containers?
Thanks, Den ons 27 maj 2020 kl 11:16 skrev <[email protected]>: > > Hi, > > On Wed, May 27, 2020 at 10:58:55AM +0200, Mans Zigher wrote: > > This is maybe more related to bitbake but I start by posting it here. > > I am for the first time trying to make use of a distributed sstate > > cache but I am getting some unexpected results and wanted to hear if > > my expectations are wrong. Everything works as expected when a build > > node is using a sstate cache from it's self so I do a clean build and > > upload the sstate cache from that build to our mirror. If then do a > > complete build using the mirror I get a 99% hit rate which is what I > > would expect. If I then start a build on a different node using the > > same cache I am only getting a 16% hit rate. I am running the builds > > inside docker so the environment should be identical. We have several > > build nodes in our CI and they where actually cloned and all of them > > have the same HW. They are all running the builds in docker but it > > looks like they can share the sstate cache and still get a 99% hit > > rate. This to me suggests that the hit rate for the sstate cache is > > node depending so a cache cannot actually be shared between different > > nodes which is not what I expected. I have not been able find any > > information about this limitation. Any clarification regarding what to > > expect from the sstate cache would be appreciated. > > We do something similar except we rsync a sstate mirror to build > nodes from latest release before a build (and topic from gerrit > are merged to latest release too to avoid sstate and build tree getting > too out of sync). > > bitbake-diffsigs can tell you why things get rebuild. The answers > should be there. > > Also note that docker images are not reproducible by default > and might end up having different patch versions of openssl etc > depending on who build them and when. One way to work around this > is to use e.g. snapshots.debian.org repos for Debian containers > with a timestamped state of the full package repo used to generate > the container. I've done something similar but manual on top of > debootstrap to create a build rootfs tarball for lxc. > > Hope this helps, > > -Mikko
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