+TImothy On Fri, Aug 31, 2018 at 11:32 AM Alexander Larsson <al...@redhat.com> wrote: > > Hi, I'm the developer behind flatpak (https://flatpak.org/) and we've > recently run into some issues with the mesa shader cache. Flatpak has > a app/runtime split where the runtime is shared between app and > provides /usr. The runtime contains a version of mesa, but this can be > overridden by runtime extensions to add other OpenGL drivers. > > Each app has a separate $XDG_CACHE_HOME, pointing into the per-app > writable storage. For example, gedit has > XDG_CACHE_HOME="/home/alex/.var/app/org.gnome.gedit/cache". This > causes mesa to store the shader cache per-app in > $XDG_CACHE_HOME/mesa_shader_cache. > > In the regular case this works fine, but sometimes the version of mesa > is changed, with the shader cache being left in place. For example, > sometimes we update the mesa version in the runtime, and sometimes the > app switches to a new runtime which has a different mesa version. > > Such updates have caused a lot of issues for us, ranging from direct > crashes at startup as in > https://github.com/flatpak/flatpak/issues/2052 and sometimes just > super-slow performance. In all cases, blowing away the shader cache > directory fixed all issues. > > The steam flatpak has a bunch of workaround for the cache: > > https://github.com/flathub/com.valvesoftware.Steam/blob/master/steam_wrapper/steam_wrapper.py#L35 > But we can't expect every app to do this. > > So, my question is, is the cache supposed to be backward compatible, > or at least versioned? Are we missing something in our mesa builds to > make that work? Is this fixed somewhere with a patch i can backport? > And if not, do we need to add some magic to flatpak to automatically > clean up the shader cache after an update?
It is supposed to be versioned automatically by mesa. > > -- > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Alexander Larsson Red Hat, Inc > al...@redhat.com alexander.lars...@gmail.com > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
