Add a stupid benchmark updating files in a loop mainly for profiling
purposes and estimating the rsrc update overhead.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
examples/Makefile | 3 +-
examples/rsrc-update-bench.c | 100 +++++++++++++++++++++++++++++++++++
2 files changed, 102 insertions(+), 1 deletion(-)
create mode 100644 examples/rsrc-update-bench.c
diff --git a/examples/Makefile b/examples/Makefile
index ce33af9..715ac4c 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -20,7 +20,8 @@ example_srcs := \
io_uring-udp.c \
link-cp.c \
poll-bench.c \
- send-zerocopy.c
+ send-zerocopy.c \
+ rsrc-update-bench.c
all_targets :=
diff --git a/examples/rsrc-update-bench.c b/examples/rsrc-update-bench.c
new file mode 100644
index 0000000..5e3cd99
--- /dev/null
+++ b/examples/rsrc-update-bench.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: MIT */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <poll.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#include "liburing.h"
+
+static unsigned long runtime_ms = 10000;
+
+static unsigned long gettimeofday_ms(void)
+{
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+ return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+}
+
+int main(void)
+{
+ unsigned long tstop;
+ unsigned long nr_reqs = 0;
+ struct io_uring_cqe *cqe;
+ struct io_uring_sqe *sqe;
+ struct io_uring ring;
+ int pipe1[2];
+ int ret, i, qd = 32;
+ int table_size = 128;
+
+ if (pipe(pipe1) != 0) {
+ perror("pipe");
+ return 1;
+ }
+
+ ret = io_uring_queue_init(1024, &ring, IORING_SETUP_SINGLE_ISSUER |
+ IORING_SETUP_DEFER_TASKRUN);
+ if (ret) {
+ fprintf(stderr, "io_uring_queue_init failed: %d\n", ret);
+ return 1;
+ }
+ ret = io_uring_register_ring_fd(&ring);
+ if (ret < 0) {
+ fprintf(stderr, "io_uring_register_ring_fd failed\n");
+ return 1;
+ }
+ ret = io_uring_register_files_sparse(&ring, table_size);
+ if (ret < 0) {
+ fprintf(stderr, "io_uring_register_files_sparse failed\n");
+ return 1;
+ }
+
+ for (i = 0; i < table_size; i++) {
+ ret = io_uring_register_files_update(&ring, i, pipe1, 1);
+ if (ret < 0) {
+ fprintf(stderr, "io_uring_register_files_update failed\n");
+ return 1;
+ }
+ }
+
+ srand(time(NULL));
+
+ tstop = gettimeofday_ms() + runtime_ms;
+ do {
+ int off = rand();
+
+ for (i = 0; i < qd; i++) {
+ sqe = io_uring_get_sqe(&ring);
+ int roff = (off + i) % table_size;
+ io_uring_prep_files_update(sqe, pipe1, 1, roff);
+ }
+
+ ret = io_uring_submit(&ring);
+ if (ret != qd) {
+ fprintf(stderr, "child: sqe submit failed: %d\n", ret);
+ return 1;
+ }
+
+ for (i = 0; i < qd; i++) {
+ ret = io_uring_wait_cqe(&ring, &cqe);
+ if (ret < 0) {
+ fprintf(stderr, "child: wait completion %d\n", ret);
+ break;
+ }
+ io_uring_cqe_seen(&ring, cqe);
+ nr_reqs++;
+ }
+ } while (gettimeofday_ms() < tstop);
+
+ fprintf(stderr, "max updates/s: %lu\n", nr_reqs * 1000UL / runtime_ms);
+
+ io_uring_queue_exit(&ring);
+ close(pipe1[0]);
+ close(pipe1[1]);
+ return 0;
+}
--
2.39.1
