Add feature for using jemalloc allocator.

Cargo.toml

@@ -33,6 +33,7 @@ git = ["git2"] # Support indicating git modifications
 paging = ["shell-words"] # Support applying a pager on the output
 regex-onig = ["syntect/regex-onig"] # Use the "oniguruma" regex engine
 regex-fancy = ["syntect/regex-fancy"] # Use the rust-only "fancy-regex" engine
+allocator-jemalloc = ["jemallocator"] # Use jemalloc instead of the system allocator
 
 [dependencies]
 atty = { version = "0.2.14", optional = true }
@@ -51,6 +52,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.8"
 semver = "0.11"
 path_abs = { version = "0.5", default-features = false }
+jemallocator = { version = "0.3.2", optional = true }
 
 [dependencies.git2]
 version = "0.13"

src/bin/bat/main.rs

@@ -1,6 +1,14 @@
 // `error_chain!` can recurse deeply
 #![recursion_limit = "1024"]
 
+// jemalloc can be faster on certain platforms
+#[cfg(feature = "allocator-jemalloc")]
+use jemallocator::Jemalloc;
+
+#[cfg(feature = "allocator-jemalloc")]
+#[global_allocator]
+static GLOBAL: Jemalloc = Jemalloc;
+
 mod app;
 mod assets;
 mod clap_app;