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- #define _GNU_SOURCE
- #include <stdio.h>
- #include <stdlib.h>
- #include <stdint.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/time.h>
- #include <unistd.h>
- #include <dirent.h>
- #include <fcntl.h>
- #include <string.h>
- #include <errno.h>
- #include <libaio.h>
- #define FASTWRITER_SYNCIO_ALIGN 4096
- #define SYNC_MODE
- #define AIO_MODE 2
- #define EXTRA_BUFFERS 2
- #define WRITE_INTERVAL 1
- size_t SKIP = 1;
- size_t SEGMENT = 0;
- size_t LINE = 0;
- #define RAID_STRIP_SIZE 256
- #define RAID_DISKS 8
- #define STRIPS_AT_ONCE 2
- #define MIN_BLOCK_SIZE (1024 * RAID_STRIP_SIZE)
- #define BLOCK_SIZE (1024 * RAID_STRIP_SIZE * RAID_DISKS * STRIPS_AT_ONCE)
- #define BUFSIZE (BLOCK_SIZE * (AIO_MODE + EXTRA_BUFFERS))
- #ifdef AIO_MODE
- # define SYNC_MODE
- #endif /* AIO_MODE */
- DIR *dir;
- struct dirent *ent;
- int flags = O_RDONLY|O_NOATIME|O_LARGEFILE|O_DIRECT;
- size_t run = 0; // file reading order
- size_t skip = 0; // file reading order
- int fd = -1; // we are currently scheduling reads from this file
- size_t offset = 0; // we are schedulling reads at this offset
- size_t size; // size of block we are schedulling to read
- size_t file_size; // total size of current file
- size_t file_block_size; // access unit for current file
- size_t curf = 0, schedf = 0;
- size_t curio = 0, schedio = 0;
- #define MAXLEN 128
- int done[AIO_MODE + EXTRA_BUFFERS];
- int done_finish[AIO_MODE + EXTRA_BUFFERS];
- char done_file[AIO_MODE + EXTRA_BUFFERS][MAXLEN + 1];
- size_t done_offset[AIO_MODE + EXTRA_BUFFERS];
- size_t done_size[AIO_MODE + EXTRA_BUFFERS];
- int done_fd[AIO_MODE + EXTRA_BUFFERS];
- #define buf(io) (io%(AIO_MODE + EXTRA_BUFFERS))
- #define max(a,b) (((a)>(b))?(a):(b))
- #define min(a,b) (((a)<(b))?(a):(b))
- #define page(size) (((size/4096)+(size%4096?1:0))*4096)
- int next_file() {
- size_t size;
- struct stat st;
-
- next:
- while ((ent = readdir(dir))) {
- skip += 1;
- if ((((skip) - 1)%SKIP) != run) continue;
- if (stat(ent->d_name, &st)) continue;
- if (!S_ISREG(st.st_mode)) continue;
- break;
- }
- if (ent) {
- size = st.st_blksize;
- int fd = open(ent->d_name, flags, 0);
- if (fd < 0) goto next;
- if (size < MIN_BLOCK_SIZE) size = BLOCK_SIZE;
- if (size > BUFSIZE) {
- printf("Buffer too small\n");
- exit(1);
- }
-
- file_block_size = size;
- file_size = st.st_size;
- offset = 0;
-
- return fd;
- } else {
- skip = 0;
- run += 1;
- if (run < SKIP) {
- closedir(dir);
- dir = opendir(".");
- goto next;
- }
- }
- return -1;
- }
- int next_block() {
- int io;
- size_t next_offset;
-
- if (fd >= 0) {
- if (LINE) offset += SEGMENT;
- else offset += size;
- if (offset >= file_size) {
- fd = -1;
- }
- }
- if (fd < 0) {
- fd = next_file();
- if (fd < 0) return -1;
- // printf("open ===> %s (%i)\n", ent->d_name, fd);
- }
- if (LINE) size = LINE;
- else size = file_block_size;
- if ((offset + size) > file_size) size = file_size - offset;
-
- io = buf(schedio);
- strncpy(done_file[io], ent->d_name, MAXLEN);
- done_offset[io] = offset;
- done_size[io] = size;
- done_fd[io] = fd;
- done[io] = 0;
- if (LINE) next_offset = offset + SEGMENT;
- else next_offset = offset + size;
- if (next_offset >= file_size) done_finish[io] = 1;
- else done_finish[io] = 0;
- return 0;
- }
- int main(int argc, char *argv[]) {
- int err;
- int i, n, io;
- long double mcoef = 1000000. / (1024 * 1024);
- io_context_t aio;
- struct iocb ios[AIO_MODE], *ioptr[AIO_MODE];
- int events;
- struct io_event ev[AIO_MODE];
- int ready;
- void *buffer;
- struct timeval start, fstart, tv;
- if (argc < 2) {
- printf("Usage: %s <directory> [skip] [segment] [line]\n", argv[0]);
- exit(0);
- }
-
- chdir(argv[1]);
- dir = opendir(".");
-
- if (argc > 2) SKIP = atoi(argv[2]);
- if (argc > 3) SEGMENT = atoi(argv[3]);
- if (argc > 4) LINE = atoi(argv[4]);
- if (!SKIP) SKIP = 1;
-
- printf("%s: Skip %zu, Segment %zu, Line %zu\n", argv[1], SKIP, SEGMENT, LINE);
- posix_memalign((void**)&buffer, FASTWRITER_SYNCIO_ALIGN, BUFSIZE);
- memset(done, 0, sizeof(done));
- memset(&aio, 0, sizeof(aio));
- io_queue_init(AIO_MODE, &aio);
- for (schedio = 0; schedio < AIO_MODE; schedio++) {
- ioptr[schedio] = &ios[schedio];
- memset(ioptr[schedio], 0, sizeof(struct iocb));
-
- err = next_block();
- if (err) break;
-
- io_prep_pread(ioptr[schedio], fd, buffer + schedio * BLOCK_SIZE, page(size), offset);
- io_set_callback(ioptr[schedio], (void*)(uintptr_t)schedio);
- // printf("sched %zu: %zu (%zu %zu)\n", schedio, schedio, offset, size);
- }
- size_t us, fileus;
- size_t last_write = 0;
- // size_t last_file_write = 0;
- // size_t last_file_size = 0;
- size_t cur_file_size = 0;
- size_t total_size = 0;
- size_t files = 0;
- gettimeofday(&start, NULL);
- gettimeofday(&fstart, NULL);
- n = io_submit(aio, schedio, ioptr);
- if (n != schedio) {
- printf("Failed to submit initial AIO job, io_submit returned %i\n", err);
- exit(-1);
- }
- curio = 0;
- events = 0;
- ready = 0;
- while ((err >= 0)||(curio != schedio)) {
- io = buf(curio);
-
- if (!done[io]) {
- // printf("%i,%i - %i [%i %i %i %i]\n", curio, schedio, events, done[0], done[1], done[2], done[3]);
- if (curio < schedio) {
- n = io_getevents(aio, 1, AIO_MODE + EXTRA_BUFFERS - events, &ev[events], NULL);
- if (n < 0) {
- printf("Error waiting for AIO (%i)\n", -err);
- exit(-1);
- }
- } else {
- n = 0;
- }
-
- if ((!ready)&&(n > 1)) {
- printf("*** Multiple read requests (%i of %i) are finished simultaneously. It is either:\n", err, AIO_MODE);
- printf(" Small buffer size (%i KB)\n", BLOCK_SIZE/1024);
- printf(" More parallel AIOs (%i) than supported by kernel, try %i\n", AIO_MODE, AIO_MODE - err);
- }
-
- for (i = 0; i < n; i++) {
- struct io_event *ep = &ev[events + i];
- int doneio = (uintptr_t)ep->data;
- io = buf(doneio);
- // printf("done %i: %lu %zu %zi\n", doneio, ep->res2, done_size[io], ep->res);
- if (ep->res2 || (ep->res < done_size[io])) {
- printf("Error in async IO (ret: %li, ret size: %zi, expected %zu)\n", ep->res2, ep->res, page(done_size[io]));
- exit(-1);
- }
- done[io] = 1;
- // printf("done (%i): %i\n", i, doneio);
- }
-
- events += n;
-
- for (i = events - 1; (i >= 0)&&((schedio - curio) < (AIO_MODE + EXTRA_BUFFERS)); i--) {
- err = next_block();
- if (err) break;
-
- // printf("sched %i: %zu (%i %zu %zu)\n", i, schedio, fd, offset, size);
- struct iocb *newio = (struct iocb *)ev[i].obj;
- memset(newio, 0, sizeof(struct iocb));
- io_prep_pread(newio, fd, buffer + buf(schedio) * BLOCK_SIZE, page(size), offset);
- io_set_callback(newio, (void*)(uintptr_t)schedio);
- err = io_submit(aio, 1, &newio);
- if (err != 1) {
- printf("Failed to submit AIO jobs %i\n", err);
- exit(-1);
- }
- schedio++;
- }
- events = i + 1;
-
- if ((events)&&(!err)) {
- printf("*** Unprocessed events (%i), probably not enough buffer space...\n", events);
- // printf(" curio (%zu), schedio (%zu)\n", curio, schedio);
- }
- ready = 1;
- continue;
- }
- io = buf(curio);
- cur_file_size += done_size[io];
- total_size += done_size[io];
- gettimeofday(&tv, NULL);
- us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
- fileus = (tv.tv_sec - fstart.tv_sec) * 1000000 + (tv.tv_usec - fstart.tv_usec);
-
- if (done_finish[io]) {
- // printf("closing %i ===> %s (%i)\n", io, done_file[io], done_fd[io]);
- close(done_fd[io]);
- gettimeofday(&fstart, NULL);
- files++;
- }
-
- if ((us - last_write) > WRITE_INTERVAL * 1000000) {
- last_write = us;
- printf("Read: %lu files (%lu GB) at %zu MB/s", files, total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
-
- if (1) {//cur_file_size > BLOCK_SIZE) {
- printf(", Last: %s (%lu MB) at %zu MB/s\n", done_file[io], cur_file_size / 1024 / 1024, (size_t)(mcoef * cur_file_size / fileus));
- } else {
- printf("\n");
- }
- }
- if (done_finish[io]) {
- cur_file_size = 0;
- }
-
- done[io] = 0;
- curio++;
- }
- gettimeofday(&tv, NULL);
- us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
- printf("Total: %lu files (%lu GB) at %zu MB/s\n", files, total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
-
- free(buffer);
- closedir(dir);
- }
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