On Mon, Aug 19, 2019 at 10:32 PM Kris Maglione <kmagli...@mozilla.com> wrote:
> On Tue, Aug 20, 2019 at 02:23:06PM +0900, ISHIKAWA,chiaki wrote: > >On 2019/08/20 9:11, Dave Townsend wrote: > >>Thanks to a tip I've tracked this down. This seems to only be the case > when > >>I have sccache enabled. Disabling it gives me nice quick incremental > builds > >>again. Of course that isn't an ideal solution but it will do for now. > >> > >>On Mon, Aug 19, 2019 at 1:55 PM Dave Townsend <dtowns...@mozilla.com> > wrote: > >> > >>>For a couple of weeks now I've seen that any attempt to build Firefox, > >>>even incremental builds seem to rebuild an awful lot of rust code. I > found > >>>this in the source which seems to suggest why: > >>> > https://searchfox.org/mozilla-central/source/config/makefiles/rust.mk#238. > >>>But, this means that now an incremental build with a couple of code > change > >>>that have no impact on rust is taking upwards of 4 minutes to complete > in > >>>comparison to around 40 seconds, and the log file is full of cargo > output. > >>>I've heard similar comments from other developers. > >>> > >>>This is a pretty big increase in the time to compile and test and is > >>>really slowing down my work. Is there any way we can avoid this? > >>> > >>____________________________________________ > > > > > >I am using linux for local development and noticed something similar. > > > >So I should disable sccache (!?). > > For what it's worth, Rust is now configured to use incremental > compilation, which has its own cache which isn't cleared after > clobber, so sccache isn't actually needed anymore. Ordinary > ccache should be sufficient. > sccache will still cache dependencies from crates.io. From a quick check building the rust in the tree on my laptop, a full cache hit for rust with sccache produces a significant speedup (2x) versus incremental alone. > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
