Jens Axboe | 3e4deca | 2019-11-22 07:23:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Description: test many files being polled for |
| 3 | * |
| 4 | */ |
| 5 | #include <errno.h> |
| 6 | #include <stdio.h> |
| 7 | #include <unistd.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <signal.h> |
| 11 | #include <sys/poll.h> |
| 12 | #include <sys/resource.h> |
| 13 | #include <fcntl.h> |
| 14 | |
| 15 | #include "liburing.h" |
| 16 | |
| 17 | #define NFILES 5000 |
| 18 | #define BATCH 500 |
| 19 | #define NLOOPS 1000 |
| 20 | |
| 21 | #define RING_SIZE 512 |
| 22 | |
| 23 | struct p { |
| 24 | int fd[2]; |
| 25 | int triggered; |
| 26 | }; |
| 27 | |
| 28 | static struct p p[NFILES]; |
| 29 | |
| 30 | static int arm_poll(struct io_uring *ring, int off) |
| 31 | { |
| 32 | struct io_uring_sqe *sqe; |
| 33 | |
| 34 | sqe = io_uring_get_sqe(ring); |
| 35 | if (!sqe) { |
| 36 | fprintf(stderr, "failed getting sqe\n"); |
| 37 | return 1; |
| 38 | } |
| 39 | |
| 40 | io_uring_prep_poll_add(sqe, p[off].fd[0], POLLIN); |
| 41 | sqe->user_data = off; |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static int reap_polls(struct io_uring *ring) |
| 46 | { |
| 47 | struct io_uring_cqe *cqe; |
| 48 | int i, ret, off; |
| 49 | char c; |
| 50 | |
| 51 | for (i = 0; i < BATCH; i++) { |
| 52 | ret = io_uring_wait_cqe(ring, &cqe); |
| 53 | if (ret) { |
| 54 | fprintf(stderr, "wait cqe %d\n", ret); |
| 55 | return ret; |
| 56 | } |
| 57 | off = cqe->user_data; |
| 58 | p[off].triggered = 0; |
| 59 | ret = read(p[off].fd[0], &c, 1); |
| 60 | if (ret != 1) { |
| 61 | fprintf(stderr, "read got %d/%d\n", ret, errno); |
| 62 | break; |
| 63 | } |
| 64 | if (arm_poll(ring, off)) |
| 65 | break; |
| 66 | io_uring_cqe_seen(ring, cqe); |
| 67 | } |
| 68 | |
| 69 | if (i != BATCH) { |
| 70 | fprintf(stderr, "gave up at %d\n", i); |
| 71 | return 1; |
| 72 | } |
| 73 | |
| 74 | ret = io_uring_submit(ring); |
| 75 | if (ret != BATCH) { |
| 76 | fprintf(stderr, "submitted %d, %d\n", ret, BATCH); |
| 77 | return 1; |
| 78 | } |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static int trigger_polls(void) |
| 84 | { |
| 85 | char c = 89; |
| 86 | int i, ret; |
| 87 | |
| 88 | for (i = 0; i < BATCH; i++) { |
| 89 | int off; |
| 90 | |
| 91 | do { |
| 92 | off = rand() % NFILES; |
| 93 | if (!p[off].triggered) |
| 94 | break; |
| 95 | } while (1); |
| 96 | |
| 97 | p[off].triggered = 1; |
| 98 | ret = write(p[off].fd[1], &c, 1); |
| 99 | if (ret != 1) { |
| 100 | fprintf(stderr, "write got %d/%d\n", ret, errno); |
| 101 | return 1; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static int arm_polls(struct io_uring *ring) |
| 109 | { |
| 110 | int ret, to_arm = NFILES, i, off; |
| 111 | |
| 112 | off = 0; |
| 113 | while (to_arm) { |
| 114 | int this_arm; |
| 115 | |
| 116 | this_arm = to_arm; |
| 117 | if (this_arm > RING_SIZE) |
| 118 | this_arm = RING_SIZE; |
| 119 | |
| 120 | for (i = 0; i < this_arm; i++) { |
| 121 | if (arm_poll(ring, off)) { |
Jens Axboe | a8dc497 | 2020-02-01 09:58:07 -0700 | [diff] [blame^] | 122 | fprintf(stderr, "arm failed at %d\n", off); |
Jens Axboe | 3e4deca | 2019-11-22 07:23:56 -0700 | [diff] [blame] | 123 | return 1; |
| 124 | } |
| 125 | off++; |
| 126 | } |
| 127 | |
| 128 | ret = io_uring_submit(ring); |
| 129 | if (ret != this_arm) { |
Jens Axboe | a8dc497 | 2020-02-01 09:58:07 -0700 | [diff] [blame^] | 130 | fprintf(stderr, "submitted %d, %d\n", ret, this_arm); |
Jens Axboe | 3e4deca | 2019-11-22 07:23:56 -0700 | [diff] [blame] | 131 | return 1; |
| 132 | } |
| 133 | to_arm -= this_arm; |
| 134 | } |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | int main(int argc, char *argv[]) |
| 140 | { |
| 141 | struct io_uring ring; |
| 142 | struct rlimit rlim; |
| 143 | int i, ret; |
| 144 | |
| 145 | if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { |
| 146 | perror("getrlimit"); |
| 147 | goto err_noring; |
| 148 | } |
| 149 | |
| 150 | if (rlim.rlim_cur < (2 * NFILES + 5)) { |
| 151 | rlim.rlim_cur = (2 * NFILES + 5); |
| 152 | rlim.rlim_max = rlim.rlim_cur; |
| 153 | if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) { |
| 154 | if (errno == EPERM) |
| 155 | goto err_nofail; |
| 156 | perror("setrlimit"); |
| 157 | goto err_noring; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | for (i = 0; i < NFILES; i++) { |
| 162 | if (pipe(p[i].fd) < 0) { |
| 163 | perror("pipe"); |
| 164 | goto err_noring; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (io_uring_queue_init(RING_SIZE, &ring, 0)) { |
| 169 | fprintf(stderr, "failed ring init\n"); |
| 170 | goto err_noring; |
| 171 | } |
| 172 | |
| 173 | if (arm_polls(&ring)) |
| 174 | goto err; |
| 175 | |
| 176 | for (i = 0; i < NLOOPS; i++) { |
| 177 | trigger_polls(); |
| 178 | ret = reap_polls(&ring); |
| 179 | if (ret) |
| 180 | goto err; |
| 181 | } |
| 182 | |
| 183 | io_uring_queue_exit(&ring); |
| 184 | return 0; |
| 185 | err: |
| 186 | io_uring_queue_exit(&ring); |
| 187 | err_noring: |
| 188 | fprintf(stderr, "poll-many failed\n"); |
| 189 | return 1; |
| 190 | err_nofail: |
| 191 | fprintf(stderr, "poll-many: not enough files available (and not root), " |
| 192 | "skipped\n"); |
| 193 | return 0; |
| 194 | } |