pingserver-rs: add rusage metrics (#319)

Adds rusage metrics to pingserver to address #314 Replaces the current metrics library with one being developed for twemcache-rs. It removes overhead of a hash lookup for each metric increment by using a fixed indexing from the metric enum into a vec of channels. On a test host this is giving ~4-5% gain in peak throughput.
twitter · Feb 4, 2021 · ced7d4e · ced7d4e
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commit ced7d4e
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/src/server/pingserver-rs/Cargo.toml b/src/server/pingserver-rs/Cargo.toml
@@ -30,11 +30,12 @@ harness = false
 boring = "1.0.3"
 chrono = "0.4.11"
 config = { path = "../../rust/config" }
+libc = "0.2.83"
 log = { version = "0.4.8", features = ["std"] }
 mio = { version = "0.7.0", features = ["os-poll", "tcp"] }
 rustcommon-buffer = { git = "https://github.com/twitter/rustcommon" }
 rustcommon-logger = { git = "https://github.com/twitter/rustcommon" }
-rustcommon-metrics = { git = "https://github.com/twitter/rustcommon" }
+rustcommon-fastmetrics = { git = "https://github.com/twitter/rustcommon" }
 slab = "0.4.2"
 strum = "0.20.0"
 strum_macros = "0.20.1"