--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/benchmark-udp-pummel.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,243 @@
+/* Copyright Joyent, Inc. and other Node 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 "task.h"
+#include "uv.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define EXPECTED "RANG TANG DING DONG I AM THE JAPANESE SANDMAN"
+
+#define TEST_DURATION 5000 /* ms */
+
+#define BASE_PORT 12345
+
+struct sender_state {
+  struct sockaddr_in addr;
+  uv_udp_send_t send_req;
+  uv_udp_t udp_handle;
+};
+
+struct receiver_state {
+  struct sockaddr_in addr;
+  uv_udp_t udp_handle;
+};
+
+/* not used in timed mode */
+static unsigned int packet_counter = (unsigned int) 1e6;
+
+static int n_senders_;
+static int n_receivers_;
+static uv_buf_t bufs[5];
+static struct sender_state senders[1024];
+static struct receiver_state receivers[1024];
+
+static unsigned int send_cb_called;
+static unsigned int recv_cb_called;
+static unsigned int close_cb_called;
+static int timed;
+static int exiting;
+
+
+static void alloc_cb(uv_handle_t* handle,
+                     size_t suggested_size,
+                     uv_buf_t* buf) {
+  static char slab[65536];
+  ASSERT_LE(suggested_size, sizeof(slab));
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void send_cb(uv_udp_send_t* req, int status) {
+  struct sender_state* s;
+
+  ASSERT_NOT_NULL(req);
+
+  if (status != 0) {
+    ASSERT_EQ(status, UV_ECANCELED);
+    return;
+  }
+
+  if (exiting)
+    return;
+
+  s = container_of(req, struct sender_state, send_req);
+  ASSERT_PTR_EQ(req->handle, &s->udp_handle);
+
+  if (timed)
+    goto send;
+
+  if (packet_counter == 0) {
+    uv_close((uv_handle_t*)&s->udp_handle, NULL);
+    return;
+  }
+
+  packet_counter--;
+
+send:
+  ASSERT_OK(uv_udp_send(&s->send_req,
+                        &s->udp_handle,
+                        bufs,
+                        ARRAY_SIZE(bufs),
+                        (const struct sockaddr*) &s->addr,
+                        send_cb));
+  send_cb_called++;
+}
+
+
+static void recv_cb(uv_udp_t* handle,
+                    ssize_t nread,
+                    const uv_buf_t* buf,
+                    const struct sockaddr* addr,
+                    unsigned flags) {
+  if (nread == 0)
+    return;
+
+  if (nread < 0) {
+    ASSERT_EQ(nread, UV_ECANCELED);
+    return;
+  }
+
+  ASSERT_EQ(addr->sa_family, AF_INET);
+  ASSERT(!memcmp(buf->base, EXPECTED, nread));
+
+  recv_cb_called++;
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  ASSERT_NOT_NULL(handle);
+  close_cb_called++;
+}
+
+
+static void timeout_cb(uv_timer_t* timer) {
+  int i;
+
+  exiting = 1;
+
+  for (i = 0; i < n_senders_; i++)
+    uv_close((uv_handle_t*)&senders[i].udp_handle, close_cb);
+
+  for (i = 0; i < n_receivers_; i++)
+    uv_close((uv_handle_t*)&receivers[i].udp_handle, close_cb);
+}
+
+
+static int pummel(unsigned int n_senders,
+                  unsigned int n_receivers,
+                  unsigned long timeout) {
+  uv_timer_t timer_handle;
+  uint64_t duration;
+  uv_loop_t* loop;
+  unsigned int i;
+
+  ASSERT_LE(n_senders, ARRAY_SIZE(senders));
+  ASSERT_LE(n_receivers, ARRAY_SIZE(receivers));
+
+  loop = uv_default_loop();
+
+  n_senders_ = n_senders;
+  n_receivers_ = n_receivers;
+
+  if (timeout) {
+    ASSERT_OK(uv_timer_init(loop, &timer_handle));
+    ASSERT_OK(uv_timer_start(&timer_handle, timeout_cb, timeout, 0));
+    /* Timer should not keep loop alive. */
+    uv_unref((uv_handle_t*)&timer_handle);
+    timed = 1;
+  }
+
+  for (i = 0; i < n_receivers; i++) {
+    struct receiver_state* s = receivers + i;
+    struct sockaddr_in addr;
+    ASSERT_OK(uv_ip4_addr("0.0.0.0", BASE_PORT + i, &addr));
+    ASSERT_OK(uv_udp_init(loop, &s->udp_handle));
+    ASSERT_OK(uv_udp_bind(&s->udp_handle, (const struct sockaddr*) &addr, 0));
+    ASSERT_OK(uv_udp_recv_start(&s->udp_handle, alloc_cb, recv_cb));
+    uv_unref((uv_handle_t*)&s->udp_handle);
+  }
+
+  bufs[0] = uv_buf_init(&EXPECTED[0],  10);
+  bufs[1] = uv_buf_init(&EXPECTED[10], 10);
+  bufs[2] = uv_buf_init(&EXPECTED[20], 10);
+  bufs[3] = uv_buf_init(&EXPECTED[30], 10);
+  bufs[4] = uv_buf_init(&EXPECTED[40], 5);
+
+  for (i = 0; i < n_senders; i++) {
+    struct sender_state* s = senders + i;
+    ASSERT_OK(uv_ip4_addr("127.0.0.1",
+                          BASE_PORT + (i % n_receivers),
+                          &s->addr));
+    ASSERT_OK(uv_udp_init(loop, &s->udp_handle));
+    ASSERT_OK(uv_udp_send(&s->send_req,
+                          &s->udp_handle,
+                          bufs,
+                          ARRAY_SIZE(bufs),
+                          (const struct sockaddr*) &s->addr,
+                          send_cb));
+  }
+
+  duration = uv_hrtime();
+  ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
+  duration = uv_hrtime() - duration;
+  /* convert from nanoseconds to milliseconds */
+  duration = duration / (uint64_t) 1e6;
+
+  printf("udp_pummel_%dv%d: %.0f/s received, %.0f/s sent. "
+         "%u received, %u sent in %.1f seconds.\n",
+         n_receivers,
+         n_senders,
+         recv_cb_called / (duration / 1000.0),
+         send_cb_called / (duration / 1000.0),
+         recv_cb_called,
+         send_cb_called,
+         duration / 1000.0);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+
+#define X(a, b)                                                               \
+  BENCHMARK_IMPL(udp_pummel_##a##v##b) {                                      \
+    return pummel(a, b, 0);                                                   \
+  }                                                                           \
+  BENCHMARK_IMPL(udp_timed_pummel_##a##v##b) {                                \
+    return pummel(a, b, TEST_DURATION);                                       \
+  }
+
+X(1, 1)
+X(1, 10)
+X(1, 100)
+X(1, 1000)
+X(10, 10)
+X(10, 100)
+X(10, 1000)
+X(100, 10)
+X(100, 100)
+X(100, 1000)
+X(1000, 1000)
+
+#undef X