1 /* SPDX-License-Identifier: MIT */
2 #include <errno.h>
3 #include <stdio.h>
4 #include <unistd.h>
5 #include <stdlib.h>
6 #include <string.h>
7 #include <signal.h>
8 #include <poll.h>
9 #include <sys/time.h>
10 #include <sys/wait.h>
11
12 #include "liburing.h"
13
14 static unsigned long runtime_ms = 10000;
15
gettimeofday_ms(void)16 static unsigned long gettimeofday_ms(void)
17 {
18 struct timeval tv;
19
20 gettimeofday(&tv, NULL);
21 return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
22 }
23
main(void)24 int main(void)
25 {
26 unsigned long tstop;
27 unsigned long nr_reqs = 0;
28 struct io_uring_cqe *cqe;
29 struct io_uring_sqe *sqe;
30 struct io_uring ring;
31 int pipe1[2];
32 int ret, i, qd = 32;
33 int table_size = 128;
34
35 if (pipe(pipe1) != 0) {
36 perror("pipe");
37 return 1;
38 }
39
40 ret = io_uring_queue_init(1024, &ring, IORING_SETUP_SINGLE_ISSUER |
41 IORING_SETUP_DEFER_TASKRUN);
42 if (ret) {
43 fprintf(stderr, "io_uring_queue_init failed: %d\n", ret);
44 return 1;
45 }
46 ret = io_uring_register_ring_fd(&ring);
47 if (ret < 0) {
48 fprintf(stderr, "io_uring_register_ring_fd failed\n");
49 return 1;
50 }
51 ret = io_uring_register_files_sparse(&ring, table_size);
52 if (ret < 0) {
53 fprintf(stderr, "io_uring_register_files_sparse failed\n");
54 return 1;
55 }
56
57 for (i = 0; i < table_size; i++) {
58 ret = io_uring_register_files_update(&ring, i, pipe1, 1);
59 if (ret < 0) {
60 fprintf(stderr, "io_uring_register_files_update failed\n");
61 return 1;
62 }
63 }
64
65 srand(time(NULL));
66
67 tstop = gettimeofday_ms() + runtime_ms;
68 do {
69 int off = rand();
70
71 for (i = 0; i < qd; i++) {
72 sqe = io_uring_get_sqe(&ring);
73 int roff = (off + i) % table_size;
74 io_uring_prep_files_update(sqe, pipe1, 1, roff);
75 }
76
77 ret = io_uring_submit(&ring);
78 if (ret != qd) {
79 fprintf(stderr, "child: sqe submit failed: %d\n", ret);
80 return 1;
81 }
82
83 for (i = 0; i < qd; i++) {
84 ret = io_uring_wait_cqe(&ring, &cqe);
85 if (ret < 0) {
86 fprintf(stderr, "child: wait completion %d\n", ret);
87 break;
88 }
89 io_uring_cqe_seen(&ring, cqe);
90 nr_reqs++;
91 }
92 } while (gettimeofday_ms() < tstop);
93
94 fprintf(stderr, "max updates/s: %lu\n", nr_reqs * 1000UL / runtime_ms);
95
96 io_uring_queue_exit(&ring);
97 close(pipe1[0]);
98 close(pipe1[1]);
99 return 0;
100 }
101