Yes, most of the build time regressions in 2017 came from Rust. Leaning more heavily on C++ features that require more processing or haven't been optimized as much as C++ features that have been around for years is likely also contributing.
Enabling sccache allows Rust compilations to be cached, which makes things much faster on subsequent builds (since many Rust crates don't change that often - but a few "large" crates like style do need to rebuild semi-frequently). We'll be transitioning workstations to the i9's because they are faster, cheaper, and have more cores than the Xeons. But if you insist on having ECC memory, you can still get the dual socket Xeons. Last I heard Sophana was having trouble finding an OEM supplier for the i9's (they are still relatively new). But if you want to put in a order for the i9 before it is listed in the hardware catalog, contact Sophana (CCd) and you can get the hook up. While I'm here, we also have a contractor slated to add distributed compilation to sccache [to replace icecream]. The contractor should start in ~days. You can send questions, feature requests, etc through Ted for now. We also had a meeting with IT and security last Friday about more officially supporting distributed compilation in offices. We want people to walk into any Mozilla office in the world and have distributed compilation "just work." Hopefully we can deliver that in 2018. On Tue, Jan 16, 2018 at 11:35 AM, Ralph Giles <gi...@mozilla.com> wrote: > On Tue, Jan 16, 2018 at 11:19 AM, Jean-Yves Avenard <jyaven...@mozilla.com > > > wrote: > > 12 minutes sounds rather long, it’s about what the macpro is currently > > doing. I typically get compilation times similar to mac... > > > > Yes, I'd like to see 7 minute build times again too! The E5-2643 has a > higher clock speed than the Xeon W in the iMac Pro (3.4 vs 3.0 GHz) but a > much lower peak frequency (3.7 vs 4.5 GHz) so maybe the iMac catches up > during the single-process bottlenecks. Or it could be memory bandwidth. > > -r > _______________________________________________ > 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
