We've added some argument parsing fixes to sccache that are necessary to improve cacheability of requests. This bump was rs+'d by Ted on #build: 12:26 PM <@ted> froydnj: are you going to bump the sccache version in m-c? 12:26 PM — @ted actually reading bugmail 12:27 PM <froydnj> ted: oh, that's right, we have git hashes, I thought you were going to need to do a minor release 12:27 PM <@ted> nah 12:27 PM <froydnj> ted: sure, I will bump that 12:27 PM <@ted> froydnj: rs=me if you don't want to jump through hoops

Pushed by nfroyd@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/15df5665d779 bump the sccache revision to include argument parsing fixes; r=ted.mielczarek

Pushed by nfroyd@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/44b8d2bb1ec0 increase the sccache idle timeout for Android/x86 jobs; r=ted.mielczarek

Pushed by nfroyd@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/ef4f0721733f fix for super-flexible data formats; r=me

https://hg.mozilla.org/mozilla-central/rev/15df5665d779 https://hg.mozilla.org/mozilla-central/rev/44b8d2bb1ec0 https://hg.mozilla.org/mozilla-central/rev/ef4f0721733f

https://hg.mozilla.org/mozilla-central/rev/15df5665d779 https://hg.mozilla.org/mozilla-central/rev/44b8d2bb1ec0 https://hg.mozilla.org/mozilla-central/rev/ef4f0721733f

This alert showed up. It looks like one platform wasn't entirely fixed. == Change summary for alert #10281 (as of November 01 2017 00:44 UTC) == Regressions: 64% sccache requests_not_cacheable summary android-4-2-x86 opt taskcluster-m4.2xlarge 16.46 -> 27.00 For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=10281

Is this something we should accept? Or must I reopen this bug?

(In reply to Ionuț Goldan [:igoldan], Performance Sheriffing from comment #7) > This alert showed up. It looks like one platform wasn't entirely fixed. > > == Change summary for alert #10281 (as of November 01 2017 00:44 UTC) == > > Regressions: > > 64% sccache requests_not_cacheable summary android-4-2-x86 opt > taskcluster-m4.2xlarge 16.46 -> 27.00 > > For up to date results, see: > https://treeherder.mozilla.org/perf.html#/alerts?id=10281 We fixed the majority of non cacheable requests by fixing sccache's argument parsing, but there are still *more* non-cacheable requests showing up than before we switched to clang? Are we executing more configure checks with clang, perhaps? I don't know how this could possibly happen otherwise. Ted, is it possible to get a breakdown of all the non-cacheable requests for more insight into these numbers?

If you change the logging options you should be able to find this in sccache.log, which gets uploaded as a build artifact. By default we use `RUST_LOG=sccache::compiler=debug`, but you could use `RUST_LOG=sccache::compiler=debug,sccache::server=debug` which will enable debug logging in server.rs, which logs the result of `parse_arguments`: https://github.com/mozilla/sccache/blob/cbb72b80df248eed18b399da7e0d77cbaedb3b07/src/server.rs#L497