refactor(runtime): use rayon worker pool

Author: DaniPopes

Cargo.lock

@@ -64,6 +64,7 @@ revm-statetest-types = { version = "17.0", default-features = false }
 crossbeam-channel = "0.5"
 crossbeam-deque = "0.8"
 crossbeam-queue = "0.3"
+rayon = "1.10"
 color-eyre = "0.6"
 criterion = { package = "codspeed-criterion-compat", version = "4", default-features = false, features = ["cargo_bench_support"] }
 eyre = "0.6"

Cargo.toml

@@ -41,14 +41,14 @@ revm-primitives.workspace = true
 revm-state.workspace = true
 
 crossbeam-channel.workspace = true
-crossbeam-deque.workspace = true
 crossbeam-queue.workspace = true
 dashmap = "6"
 derive_more = { version = "2", default-features = false, features = ["debug"] }
 eyre.workspace = true
 libloading = "0.9"
 tempfile = "3.10"
 quanta.workspace = true
+rayon.workspace = true
 tracing.workspace = true
 
 [dev-dependencies]

crates/revmc-runtime/Cargo.toml

@@ -228,6 +228,22 @@ fn startup_store_failure() {
 // Tests: lookup behavior.
 // ===========================================================================
 
+#[test]
+fn zero_workers_fails_sync_compile_without_blocking() {
+    let tb = TestBackend::new(RuntimeConfig {
+        blocking: true,
+        tuning: RuntimeTuning { jit_worker_count: 0, ..Default::default() },
+        ..Default::default()
+    });
+
+    let decision = tb.lookup(TestBackend::req_cancun(BYTECODE_RET42));
+    assert!(matches!(decision, LookupDecision::Interpret(InterpretReason::JitFailed)));
+
+    let stats = tb.stats();
+    assert_eq!(stats.resident_entries, 0);
+    assert_eq!(stats.compilations_dispatched, 0);
+}
+
 #[test]
 fn lookup_disabled() {
     let tb = TestBackend::new(RuntimeConfig { enabled: false, ..Default::default() });