Enable link-time optimizations (#1227)

This change enables LTO for release builds, which reduces CPU and memory usage in load tests. This increases compile-time overhead, so we also update rust-toolchain to 1.55.0 beta7 (due out 2021/9/9), which substantially reduces compile- time overhead.
linkerd · Aug 27, 2021 · 8e1084e · 8e1084e
1 parent f6b1282
commit 8e1084e
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diff --git a/Cargo.toml b/Cargo.toml
@@ -66,8 +66,12 @@ members = [
 # disable them.
 [profile.dev]
 debug = false
+
 [profile.test]
 debug = false
 
+[profile.release]
+lto = true
+
 [patch.crates-io]
 webpki = { git = "https://github.com/linkerd/webpki", branch = "cert-dns-names-0.21" }
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-1.54.0
+beta-2021-08-22