5 files changed, 37 insertions, 2 deletions
diff --git a/cli/bench/http/deno_http_flash.js b/cli/bench/http/deno_http_flash.js
index 7c486f422..4b6a1eb21 100644
--- a/cli/bench/http/deno_http_flash.js
+++ b/cli/bench/http/deno_http_flash.js
@@ -8,4 +8,4 @@ function handler() {
   return new Response("Hello World");
 }
 
-serve(handler, { hostname, port });
+serve(handler, { hostname, port, reusePort: true });
diff --git a/cli/bench/http/deno_http_flash_ops.js b/cli/bench/http/deno_http_flash_ops.js
index 40ca25ff1..970447a42 100644
--- a/cli/bench/http/deno_http_flash_ops.js
+++ b/cli/bench/http/deno_http_flash_ops.js
@@ -11,7 +11,7 @@ const {
 } = Deno;
 const addr = Deno.args[0] || "127.0.0.1:4500";
 const [hostname, port] = addr.split(":");
-const serverId = op_flash_serve({ hostname, port });
+const serverId = op_flash_serve({ hostname, port, reuseport: true });
 const serverPromise = opAsync("op_flash_drive_server", serverId);
 
 const fastOps = op_flash_make_request();
diff --git a/cli/bench/http/deno_http_flash_ops_spawn.js b/cli/bench/http/deno_http_flash_ops_spawn.js
new file mode 100644
index 000000000..6ee39a84a
--- /dev/null
+++ b/cli/bench/http/deno_http_flash_ops_spawn.js
@@ -0,0 +1,16 @@
+if (Deno.build.os !== "linux") {
+  throw new Error("SO_REUSEPORT is only supported on Linux");
+}
+
+const executable = Deno.execPath();
+const path = new URL("./deno_http_flash_ops.js", import.meta.url).pathname;
+// single flash instance runs on ~1.8 cores
+const cpus = navigator.hardwareConcurrency / 2;
+const processes = new Array(cpus);
+for (let i = 0; i < cpus; i++) {
+  const proc = Deno.run({
+    cmd: [executable, "run", "-A", "--unstable", path, Deno.args[0]],
+  });
+  processes.push(proc.status());
+}
+await Promise.all(processes);
diff --git a/cli/bench/http/deno_http_flash_spawn.js b/cli/bench/http/deno_http_flash_spawn.js
new file mode 100644
index 000000000..eb827b34b
--- /dev/null
+++ b/cli/bench/http/deno_http_flash_spawn.js
@@ -0,0 +1,16 @@
+if (Deno.build.os !== "linux") {
+  throw new Error("SO_REUSEPORT is only supported on Linux");
+}
+
+const executable = Deno.execPath();
+const path = new URL("./deno_http_flash.js", import.meta.url).pathname;
+// single flash instance runs on ~1.8 cores
+const cpus = navigator.hardwareConcurrency / 2;
+const processes = new Array(cpus);
+for (let i = 0; i < cpus; i++) {
+  const proc = Deno.run({
+    cmd: [executable, "run", "-A", "--unstable", path, Deno.args[0]],
+  });
+  processes.push(proc.status());
+}
+await Promise.all(processes);
diff --git a/cli/dts/lib.deno.unstable.d.ts b/cli/dts/lib.deno.unstable.d.ts
index 98cae94a4..a25c1011e 100644
--- a/cli/dts/lib.deno.unstable.d.ts
+++ b/cli/dts/lib.deno.unstable.d.ts
@@ -1352,6 +1352,9 @@ declare namespace Deno {
     /** An AbortSignal to close the server and all connections. */
     signal?: AbortSignal;
 
+    /** Sets SO_REUSEPORT on Linux. */
+    reusePort?: boolean;
+
     /** The handler to invoke when route handlers throw an error. */
     onError?: (error: unknown) => Response | Promise<Response>;