Use jemalloc (#1321)

In load tests, it appears that jemalloc is--perhaps unsurprisingly--more efficient
than the alternatives. Specifically, jemalloc uses less memory and is more responsive
to memory being released without substantially impacting latency or CPU usage.

This is only enabled on `x86_64-unknown-linux-gnu`, as this is the only platform
on which all tests pass, etc (per [gnzlbg/jemallocator][readme]).

[readme]: https://github.com/gnzlbg/jemallocator/tree/c27a859e98e3cb790dc269773d9da71a1e918458#platform-support

Cargo.lock

@@ -226,6 +226,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "fs_extra"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2022715d62ab30faffd124d40b76f4134a550a87792276512b18d63272333394"
+
 [[package]]
 name = "futures"
 version = "0.3.17"
@@ -549,6 +555,27 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b71991ff56294aa922b450139ee08b3bfc70982c6b2c7562771375cf73542dd4"
 
+[[package]]
+name = "jemalloc-sys"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d3b9f3f5c9b31aa0f5ed3260385ac205db665baa41d49bb8338008ae94ede45"
+dependencies = [
+ "cc",
+ "fs_extra",
+ "libc",
+]
+
+[[package]]
+name = "jemallocator"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43ae63fcfc45e99ab3d1b29a46782ad679e98436c3169d15a167a1108a724b69"
+dependencies = [
+ "jemalloc-sys",
+ "libc",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.55"
@@ -581,15 +608,6 @@ dependencies = [
  "once_cell",
 ]
 
-[[package]]
-name = "libmimalloc-sys"
-version = "0.1.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d1b8479c593dba88c2741fc50b92e13dbabbbe0bd504d979f244ccc1a5b1c01"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "linked-hash-map"
 version = "0.5.4"
@@ -1469,9 +1487,9 @@ name = "linkerd2-proxy"
 version = "0.1.0"
 dependencies = [
  "futures",
+ "jemallocator",
  "linkerd-app",
  "linkerd-signal",
- "mimalloc",
  "num_cpus",
  "tokio",
  "tracing",
@@ -1548,15 +1566,6 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
 
-[[package]]
-name = "mimalloc"
-version = "0.1.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb74897ce508e6c49156fd1476fc5922cbc6e75183c65e399c765a09122e5130"
-dependencies = [
- "libmimalloc-sys",
-]
-
 [[package]]
 name = "miniz_oxide"
 version = "0.4.4"

linkerd2-proxy/Cargo.toml

@@ -13,9 +13,11 @@ multicore = ["tokio/rt-multi-thread", "num_cpus"]
 
 [dependencies]
 futures = { version = "0.3", default-features = false }
-mimalloc = { version = "0.1.26", optional = true }
 num_cpus = { version = "1", optional = true }
 linkerd-app = { path = "../linkerd/app" }
 linkerd-signal = { path = "../linkerd/signal" }
 tokio = { version = "1", features = ["rt", "time", "net"] }
 tracing = "0.1.29"
+
+[target.x86_64-unknown-linux-gnu.dependencies]
+jemallocator = { version = "0.3" }

linkerd2-proxy/src/main.rs

@@ -9,9 +9,9 @@ use linkerd_signal as signal;
 use tokio::sync::mpsc;
 pub use tracing::{debug, error, info, warn};
 
-#[cfg(feature = "mimalloc")]
+#[cfg(all(target_os = "linux", target_arch = "x86_64", target_env = "gnu"))]
 #[global_allocator]
-static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+static GLOBAL: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
 mod rt;