cli: use mimalloc from jj-cbits as the default memory allocator

Signed-off-by: Austin Seipp <[email protected]>
Change-Id: I522b80f0fcfe3173c1412cdd9f49d127

cli/Cargo.toml

@@ -51,6 +51,7 @@ gix = { workspace = true }
 hex = { workspace = true }
 indexmap = { workspace = true }
 itertools = { workspace = true }
+jj-cbits = { workspace = true }
 jj-lib = { workspace = true }
 maplit = { workspace = true }
 minus = { workspace = true }
@@ -89,8 +90,9 @@ testutils = { workspace = true }
 jj-cli = { path = ".", features = ["test-fakes"], default-features = false }
 
 [features]
-default = ["watchman"]
+default = ["watchman", "mimalloc"]
 bench = ["dep:criterion"]
+mimalloc = []
 packaging = []
 test-fakes = ["jj-lib/testing"]
 vendored-openssl = ["git2/vendored-openssl", "jj-lib/vendored-openssl"]

cli/src/main.rs

@@ -12,8 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#[cfg(feature = "mimalloc")]
+use jj_cbits::mimalloc::MiMalloc;
 use jj_cli::cli_util::CliRunner;
 
+#[cfg(feature = "mimalloc")]
+#[global_allocator]
+static ALLOC: MiMalloc = MiMalloc;
+
 fn main() -> std::process::ExitCode {
     CliRunner::init().version(env!("JJ_VERSION")).run()
 }