--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/benchmark-ping-udp.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,169 @@
+/* Copyright libuv project contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "task.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+/* Run the benchmark for this many ms */
+#define TIME 5000
+
+typedef struct {
+  int pongs;
+  int state;
+  uv_udp_t udp;
+  struct sockaddr_in server_addr;
+} pinger_t;
+
+typedef struct buf_s {
+  uv_buf_t uv_buf_t;
+  struct buf_s* next;
+} buf_t;
+
+static char PING[] = "PING\n";
+
+static uv_loop_t* loop;
+
+static int completed_pingers;
+static unsigned long completed_pings;
+static int64_t start_time;
+
+
+static void buf_alloc(uv_handle_t* tcp, size_t size, uv_buf_t* buf) {
+  static char slab[64 * 1024];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void buf_free(const uv_buf_t* buf) {
+}
+
+
+static void pinger_close_cb(uv_handle_t* handle) {
+  pinger_t* pinger;
+
+  pinger = (pinger_t*)handle->data;
+#if DEBUG
+  fprintf(stderr, "ping_pongs: %d roundtrips/s\n",
+	  pinger->pongs / (TIME / 1000));
+#endif
+
+  completed_pings += pinger->pongs;
+  completed_pingers++;
+  free(pinger);
+}
+
+static void pinger_write_ping(pinger_t* pinger) {
+  uv_buf_t buf;
+  int r;
+
+  buf = uv_buf_init(PING, sizeof(PING) - 1);
+  r = uv_udp_try_send(&pinger->udp, &buf, 1,
+                      (const struct sockaddr*) &pinger->server_addr);
+  if (r < 0)
+    FATAL("uv_udp_send failed");
+}
+
+static void pinger_read_cb(uv_udp_t* udp,
+                           ssize_t nread,
+                           const uv_buf_t* buf,
+                           const struct sockaddr* addr,
+                           unsigned flags) {
+  ssize_t i;
+  pinger_t* pinger;
+  pinger = (pinger_t*)udp->data;
+
+  /* No data here means something went wrong */
+  ASSERT_GT(nread, 0);
+
+  /* Now we count the pings */
+  for (i = 0; i < nread; i++) {
+    ASSERT_EQ(buf->base[i], PING[pinger->state]);
+    pinger->state = (pinger->state + 1) % (sizeof(PING) - 1);
+    if (pinger->state == 0) {
+      pinger->pongs++;
+      if (uv_now(loop) - start_time > TIME) {
+        uv_close((uv_handle_t*)udp, pinger_close_cb);
+        break;
+      }
+      pinger_write_ping(pinger);
+    }
+  }
+
+  if (buf && !(flags & UV_UDP_MMSG_CHUNK))
+    buf_free(buf);
+}
+
+static void udp_pinger_new(void) {
+  pinger_t* pinger = malloc(sizeof(*pinger));
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &pinger->server_addr));
+  pinger->state = 0;
+  pinger->pongs = 0;
+
+  /* Try to do NUM_PINGS ping-pongs (connection-less). */
+  r = uv_udp_init(loop, &pinger->udp);
+  ASSERT_OK(r);
+  r = uv_udp_bind(&pinger->udp, (const struct sockaddr*) &pinger->server_addr, 0);
+  ASSERT_OK(r);
+
+  pinger->udp.data = pinger;
+
+  /* Start pinging */
+  if (0 != uv_udp_recv_start(&pinger->udp, buf_alloc, pinger_read_cb)) {
+    FATAL("uv_udp_read_start failed");
+  }
+  pinger_write_ping(pinger);
+}
+
+static int ping_udp(unsigned pingers) {
+  unsigned i;
+
+  loop = uv_default_loop();
+  start_time = uv_now(loop);
+
+  for (i = 0; i < pingers; ++i) {
+    udp_pinger_new();
+  }
+  uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_GE(completed_pingers, 1);
+
+  fprintf(stderr, "ping_pongs: %d pingers, ~ %lu roundtrips/s\n",
+          completed_pingers, completed_pings / (TIME/1000));
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+#define X(PINGERS) \
+BENCHMARK_IMPL(ping_udp##PINGERS) {\
+  return ping_udp(PINGERS); \
+}
+
+X(1)
+X(10)
+X(100)
+
+#undef X