593 lines
12 KiB
C
593 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple benchmark program that uses the various features of io_uring
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* to provide fast random access to a device/file. It has various
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* options that are control how we use io_uring, see the OPTIONS section
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* below. This uses the raw io_uring interface.
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*
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* Copyright (C) 2018-2019 Jens Axboe
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <signal.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <sys/resource.h>
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#include <sys/mman.h>
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#include <sys/uio.h>
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#include <linux/fs.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <pthread.h>
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#include <sched.h>
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#include "liburing.h"
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#include "barrier.h"
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#define min(a, b) ((a < b) ? (a) : (b))
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struct io_sq_ring {
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unsigned *head;
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unsigned *tail;
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unsigned *ring_mask;
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unsigned *ring_entries;
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unsigned *flags;
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unsigned *array;
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};
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struct io_cq_ring {
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unsigned *head;
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unsigned *tail;
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unsigned *ring_mask;
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unsigned *ring_entries;
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struct io_uring_cqe *cqes;
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};
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#define DEPTH 128
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#define BATCH_SUBMIT 32
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#define BATCH_COMPLETE 32
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#define BS 4096
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#define MAX_FDS 16
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static unsigned sq_ring_mask, cq_ring_mask;
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struct file {
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unsigned long max_blocks;
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unsigned pending_ios;
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int real_fd;
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int fixed_fd;
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};
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struct submitter {
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pthread_t thread;
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int ring_fd;
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struct drand48_data rand;
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struct io_sq_ring sq_ring;
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struct io_uring_sqe *sqes;
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struct iovec iovecs[DEPTH];
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struct io_cq_ring cq_ring;
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int inflight;
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unsigned long reaps;
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unsigned long done;
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unsigned long calls;
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volatile int finish;
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__s32 *fds;
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struct file files[MAX_FDS];
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unsigned nr_files;
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unsigned cur_file;
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};
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static struct submitter submitters[1];
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static volatile int finish;
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/*
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* OPTIONS: Set these to test the various features of io_uring.
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*/
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static int polled = 1; /* use IO polling */
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static int fixedbufs = 1; /* use fixed user buffers */
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static int register_files = 1; /* use fixed files */
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static int buffered = 0; /* use buffered IO, not O_DIRECT */
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static int sq_thread_poll = 0; /* use kernel submission/poller thread */
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static int sq_thread_cpu = -1; /* pin above thread to this CPU */
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static int do_nop = 0; /* no-op SQ ring commands */
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static int io_uring_register_buffers(struct submitter *s)
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{
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if (do_nop)
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return 0;
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return io_uring_register(s->ring_fd, IORING_REGISTER_BUFFERS, s->iovecs,
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DEPTH);
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}
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static int io_uring_register_files(struct submitter *s)
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{
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unsigned i;
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if (do_nop)
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return 0;
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s->fds = calloc(s->nr_files, sizeof(__s32));
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for (i = 0; i < s->nr_files; i++) {
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s->fds[i] = s->files[i].real_fd;
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s->files[i].fixed_fd = i;
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}
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return io_uring_register(s->ring_fd, IORING_REGISTER_FILES, s->fds,
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s->nr_files);
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}
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static int lk_gettid(void)
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{
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return syscall(__NR_gettid);
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}
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static unsigned file_depth(struct submitter *s)
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{
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return (DEPTH + s->nr_files - 1) / s->nr_files;
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}
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static void init_io(struct submitter *s, unsigned index)
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{
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struct io_uring_sqe *sqe = &s->sqes[index];
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unsigned long offset;
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struct file *f;
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long r;
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if (do_nop) {
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sqe->opcode = IORING_OP_NOP;
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return;
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}
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if (s->nr_files == 1) {
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f = &s->files[0];
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} else {
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f = &s->files[s->cur_file];
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if (f->pending_ios >= file_depth(s)) {
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s->cur_file++;
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if (s->cur_file == s->nr_files)
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s->cur_file = 0;
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f = &s->files[s->cur_file];
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}
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}
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f->pending_ios++;
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lrand48_r(&s->rand, &r);
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offset = (r % (f->max_blocks - 1)) * BS;
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if (register_files) {
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sqe->flags = IOSQE_FIXED_FILE;
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sqe->fd = f->fixed_fd;
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} else {
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sqe->flags = 0;
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sqe->fd = f->real_fd;
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}
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if (fixedbufs) {
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sqe->opcode = IORING_OP_READ_FIXED;
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sqe->addr = (unsigned long) s->iovecs[index].iov_base;
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sqe->len = BS;
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sqe->buf_index = index;
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} else {
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sqe->opcode = IORING_OP_READV;
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sqe->addr = (unsigned long) &s->iovecs[index];
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sqe->len = 1;
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sqe->buf_index = 0;
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}
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sqe->ioprio = 0;
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sqe->off = offset;
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sqe->user_data = (unsigned long) f;
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}
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static int prep_more_ios(struct submitter *s, unsigned max_ios)
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{
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struct io_sq_ring *ring = &s->sq_ring;
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unsigned index, tail, next_tail, prepped = 0;
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next_tail = tail = *ring->tail;
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do {
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next_tail++;
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read_barrier();
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if (next_tail == *ring->head)
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break;
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index = tail & sq_ring_mask;
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init_io(s, index);
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ring->array[index] = index;
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prepped++;
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tail = next_tail;
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} while (prepped < max_ios);
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if (*ring->tail != tail) {
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/* order tail store with writes to sqes above */
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write_barrier();
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*ring->tail = tail;
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write_barrier();
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}
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return prepped;
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}
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static int get_file_size(struct file *f)
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{
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struct stat st;
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if (fstat(f->real_fd, &st) < 0)
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return -1;
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if (S_ISBLK(st.st_mode)) {
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unsigned long long bytes;
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if (ioctl(f->real_fd, BLKGETSIZE64, &bytes) != 0)
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return -1;
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f->max_blocks = bytes / BS;
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return 0;
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} else if (S_ISREG(st.st_mode)) {
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f->max_blocks = st.st_size / BS;
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return 0;
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}
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return -1;
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}
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static int reap_events(struct submitter *s)
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{
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struct io_cq_ring *ring = &s->cq_ring;
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struct io_uring_cqe *cqe;
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unsigned head, reaped = 0;
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head = *ring->head;
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do {
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struct file *f;
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read_barrier();
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if (head == *ring->tail)
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break;
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cqe = &ring->cqes[head & cq_ring_mask];
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if (!do_nop) {
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f = (struct file *) (uintptr_t) cqe->user_data;
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f->pending_ios--;
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if (cqe->res != BS) {
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printf("io: unexpected ret=%d\n", cqe->res);
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if (polled && cqe->res == -EOPNOTSUPP)
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printf("Your filesystem doesn't support poll\n");
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return -1;
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}
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}
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reaped++;
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head++;
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} while (1);
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s->inflight -= reaped;
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*ring->head = head;
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write_barrier();
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return reaped;
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}
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static void *submitter_fn(void *data)
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{
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struct submitter *s = data;
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struct io_sq_ring *ring = &s->sq_ring;
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int ret, prepped;
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printf("submitter=%d\n", lk_gettid());
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srand48_r(pthread_self(), &s->rand);
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prepped = 0;
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do {
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int to_wait, to_submit, this_reap, to_prep;
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if (!prepped && s->inflight < DEPTH) {
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to_prep = min(DEPTH - s->inflight, BATCH_SUBMIT);
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prepped = prep_more_ios(s, to_prep);
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}
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s->inflight += prepped;
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submit_more:
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to_submit = prepped;
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submit:
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if (to_submit && (s->inflight + to_submit <= DEPTH))
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to_wait = 0;
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else
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to_wait = min(s->inflight + to_submit, BATCH_COMPLETE);
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/*
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* Only need to call io_uring_enter if we're not using SQ thread
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* poll, or if IORING_SQ_NEED_WAKEUP is set.
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*/
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if (!sq_thread_poll || (*ring->flags & IORING_SQ_NEED_WAKEUP)) {
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unsigned flags = 0;
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if (to_wait)
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flags = IORING_ENTER_GETEVENTS;
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if ((*ring->flags & IORING_SQ_NEED_WAKEUP))
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flags |= IORING_ENTER_SQ_WAKEUP;
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ret = io_uring_enter(s->ring_fd, to_submit, to_wait,
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flags, NULL);
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s->calls++;
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}
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/*
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* For non SQ thread poll, we already got the events we needed
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* through the io_uring_enter() above. For SQ thread poll, we
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* need to loop here until we find enough events.
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*/
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this_reap = 0;
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do {
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int r;
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r = reap_events(s);
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if (r == -1) {
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s->finish = 1;
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break;
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} else if (r > 0)
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this_reap += r;
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} while (sq_thread_poll && this_reap < to_wait);
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s->reaps += this_reap;
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if (ret >= 0) {
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if (!ret) {
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to_submit = 0;
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if (s->inflight)
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goto submit;
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continue;
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} else if (ret < to_submit) {
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int diff = to_submit - ret;
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s->done += ret;
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prepped -= diff;
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goto submit_more;
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}
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s->done += ret;
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prepped = 0;
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continue;
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} else if (ret < 0) {
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if (errno == EAGAIN) {
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if (s->finish)
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break;
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if (this_reap)
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goto submit;
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to_submit = 0;
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goto submit;
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}
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printf("io_submit: %s\n", strerror(errno));
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break;
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}
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} while (!s->finish);
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finish = 1;
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return NULL;
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}
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static void sig_int(int sig)
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{
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printf("Exiting on signal %d\n", sig);
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submitters[0].finish = 1;
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finish = 1;
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}
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static void arm_sig_int(void)
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{
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struct sigaction act;
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memset(&act, 0, sizeof(act));
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act.sa_handler = sig_int;
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act.sa_flags = SA_RESTART;
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sigaction(SIGINT, &act, NULL);
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}
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static int setup_ring(struct submitter *s)
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{
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struct io_sq_ring *sring = &s->sq_ring;
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struct io_cq_ring *cring = &s->cq_ring;
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struct io_uring_params p;
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int ret, fd;
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void *ptr;
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memset(&p, 0, sizeof(p));
|
||
|
|
|
||
|
|
if (polled && !do_nop)
|
||
|
|
p.flags |= IORING_SETUP_IOPOLL;
|
||
|
|
if (sq_thread_poll) {
|
||
|
|
p.flags |= IORING_SETUP_SQPOLL;
|
||
|
|
if (sq_thread_cpu != -1) {
|
||
|
|
p.flags |= IORING_SETUP_SQ_AFF;
|
||
|
|
p.sq_thread_cpu = sq_thread_cpu;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fd = io_uring_setup(DEPTH, &p);
|
||
|
|
if (fd < 0) {
|
||
|
|
perror("io_uring_setup");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
s->ring_fd = fd;
|
||
|
|
|
||
|
|
if (fixedbufs) {
|
||
|
|
ret = io_uring_register_buffers(s);
|
||
|
|
if (ret < 0) {
|
||
|
|
perror("io_uring_register_buffers");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (register_files) {
|
||
|
|
ret = io_uring_register_files(s);
|
||
|
|
if (ret < 0) {
|
||
|
|
perror("io_uring_register_files");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ptr = mmap(0, p.sq_off.array + p.sq_entries * sizeof(__u32),
|
||
|
|
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
|
||
|
|
IORING_OFF_SQ_RING);
|
||
|
|
printf("sq_ring ptr = 0x%p\n", ptr);
|
||
|
|
sring->head = ptr + p.sq_off.head;
|
||
|
|
sring->tail = ptr + p.sq_off.tail;
|
||
|
|
sring->ring_mask = ptr + p.sq_off.ring_mask;
|
||
|
|
sring->ring_entries = ptr + p.sq_off.ring_entries;
|
||
|
|
sring->flags = ptr + p.sq_off.flags;
|
||
|
|
sring->array = ptr + p.sq_off.array;
|
||
|
|
sq_ring_mask = *sring->ring_mask;
|
||
|
|
|
||
|
|
s->sqes = mmap(0, p.sq_entries * sizeof(struct io_uring_sqe),
|
||
|
|
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
|
||
|
|
IORING_OFF_SQES);
|
||
|
|
printf("sqes ptr = 0x%p\n", s->sqes);
|
||
|
|
|
||
|
|
ptr = mmap(0, p.cq_off.cqes + p.cq_entries * sizeof(struct io_uring_cqe),
|
||
|
|
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
|
||
|
|
IORING_OFF_CQ_RING);
|
||
|
|
printf("cq_ring ptr = 0x%p\n", ptr);
|
||
|
|
cring->head = ptr + p.cq_off.head;
|
||
|
|
cring->tail = ptr + p.cq_off.tail;
|
||
|
|
cring->ring_mask = ptr + p.cq_off.ring_mask;
|
||
|
|
cring->ring_entries = ptr + p.cq_off.ring_entries;
|
||
|
|
cring->cqes = ptr + p.cq_off.cqes;
|
||
|
|
cq_ring_mask = *cring->ring_mask;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void file_depths(char *buf)
|
||
|
|
{
|
||
|
|
struct submitter *s = &submitters[0];
|
||
|
|
unsigned i;
|
||
|
|
char *p;
|
||
|
|
|
||
|
|
buf[0] = '\0';
|
||
|
|
p = buf;
|
||
|
|
for (i = 0; i < s->nr_files; i++) {
|
||
|
|
struct file *f = &s->files[i];
|
||
|
|
|
||
|
|
if (i + 1 == s->nr_files)
|
||
|
|
p += sprintf(p, "%d", f->pending_ios);
|
||
|
|
else
|
||
|
|
p += sprintf(p, "%d, ", f->pending_ios);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
struct submitter *s = &submitters[0];
|
||
|
|
unsigned long done, calls, reap;
|
||
|
|
int err, i, flags, fd;
|
||
|
|
char *fdepths;
|
||
|
|
void *ret;
|
||
|
|
|
||
|
|
if (!do_nop && argc < 2) {
|
||
|
|
printf("%s: filename\n", argv[0]);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
flags = O_RDONLY | O_NOATIME;
|
||
|
|
if (!buffered)
|
||
|
|
flags |= O_DIRECT;
|
||
|
|
|
||
|
|
i = 1;
|
||
|
|
while (!do_nop && i < argc) {
|
||
|
|
struct file *f;
|
||
|
|
|
||
|
|
if (s->nr_files == MAX_FDS) {
|
||
|
|
printf("Max number of files (%d) reached\n", MAX_FDS);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
fd = open(argv[i], flags);
|
||
|
|
if (fd < 0) {
|
||
|
|
perror("open");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
f = &s->files[s->nr_files];
|
||
|
|
f->real_fd = fd;
|
||
|
|
if (get_file_size(f)) {
|
||
|
|
printf("failed getting size of device/file\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (f->max_blocks <= 1) {
|
||
|
|
printf("Zero file/device size?\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
f->max_blocks--;
|
||
|
|
|
||
|
|
printf("Added file %s\n", argv[i]);
|
||
|
|
s->nr_files++;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (fixedbufs) {
|
||
|
|
struct rlimit rlim;
|
||
|
|
|
||
|
|
rlim.rlim_cur = RLIM_INFINITY;
|
||
|
|
rlim.rlim_max = RLIM_INFINITY;
|
||
|
|
if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
|
||
|
|
perror("setrlimit");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
arm_sig_int();
|
||
|
|
|
||
|
|
for (i = 0; i < DEPTH; i++) {
|
||
|
|
void *buf;
|
||
|
|
|
||
|
|
if (posix_memalign(&buf, BS, BS)) {
|
||
|
|
printf("failed alloc\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
s->iovecs[i].iov_base = buf;
|
||
|
|
s->iovecs[i].iov_len = BS;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = setup_ring(s);
|
||
|
|
if (err) {
|
||
|
|
printf("ring setup failed: %s, %d\n", strerror(errno), err);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
printf("polled=%d, fixedbufs=%d, buffered=%d", polled, fixedbufs, buffered);
|
||
|
|
printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, *s->sq_ring.ring_entries, *s->cq_ring.ring_entries);
|
||
|
|
|
||
|
|
pthread_create(&s->thread, NULL, submitter_fn, s);
|
||
|
|
|
||
|
|
fdepths = malloc(8 * s->nr_files);
|
||
|
|
reap = calls = done = 0;
|
||
|
|
do {
|
||
|
|
unsigned long this_done = 0;
|
||
|
|
unsigned long this_reap = 0;
|
||
|
|
unsigned long this_call = 0;
|
||
|
|
unsigned long rpc = 0, ipc = 0;
|
||
|
|
|
||
|
|
sleep(1);
|
||
|
|
this_done += s->done;
|
||
|
|
this_call += s->calls;
|
||
|
|
this_reap += s->reaps;
|
||
|
|
if (this_call - calls) {
|
||
|
|
rpc = (this_done - done) / (this_call - calls);
|
||
|
|
ipc = (this_reap - reap) / (this_call - calls);
|
||
|
|
} else
|
||
|
|
rpc = ipc = -1;
|
||
|
|
file_depths(fdepths);
|
||
|
|
printf("IOPS=%lu, IOS/call=%ld/%ld, inflight=%u (%s)\n",
|
||
|
|
this_done - done, rpc, ipc, s->inflight,
|
||
|
|
fdepths);
|
||
|
|
done = this_done;
|
||
|
|
calls = this_call;
|
||
|
|
reap = this_reap;
|
||
|
|
} while (!finish);
|
||
|
|
|
||
|
|
pthread_join(s->thread, &ret);
|
||
|
|
close(s->ring_fd);
|
||
|
|
free(fdepths);
|
||
|
|
return 0;
|
||
|
|
}
|