2 * Code related to writing an iolog of what a thread is doing, and to
3 * later read that back and replay
11 static const char iolog_ver2[] = "fio version 2 iolog";
13 void log_io_u(struct thread_data *td, struct io_u *io_u)
15 const char *act[] = { "read", "write", "sync" };
17 assert(io_u->ddir < 3);
19 if (!td->o.write_iolog_file)
22 fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name, act[io_u->ddir], io_u->offset, io_u->buflen);
25 void log_file(struct thread_data *td, struct fio_file *f,
26 enum file_log_act what)
28 const char *act[] = { "add", "open", "close" };
32 if (!td->o.write_iolog_file)
35 fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
38 static void iolog_delay(struct thread_data *td, unsigned long delay)
40 unsigned long usec = utime_since_now(&td->last_issue);
48 * less than 100 usec delay, just regard it as noise
53 usec_sleep(td, delay);
56 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
60 while (!list_empty(&td->io_log_list)) {
61 ipo = list_entry(td->io_log_list.next, struct io_piece, list);
65 * invalid ddir, this is a file action
67 if (ipo->ddir == DDIR_INVAL) {
68 struct fio_file *f = &td->files[ipo->fileno];
70 if (ipo->file_action == FIO_LOG_OPEN_FILE) {
71 assert(!td_io_open_file(td, f));
74 } else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
75 td_io_close_file(td, f);
81 io_u->offset = ipo->offset;
82 io_u->buflen = ipo->len;
83 io_u->ddir = ipo->ddir;
84 io_u->file = &td->files[ipo->fileno];
88 iolog_delay(td, ipo->delay);
97 void prune_io_piece_log(struct thread_data *td)
102 while ((n = rb_first(&td->io_hist_tree)) != NULL) {
103 ipo = rb_entry(n, struct io_piece, rb_node);
104 rb_erase(n, &td->io_hist_tree);
110 * log a successful write, so we can unwind the log for verify
112 void log_io_piece(struct thread_data *td, struct io_u *io_u)
114 struct rb_node **p, *parent;
115 struct io_piece *ipo, *__ipo;
117 ipo = malloc(sizeof(struct io_piece));
118 ipo->file = io_u->file;
119 ipo->offset = io_u->offset;
120 ipo->len = io_u->buflen;
123 * We don't need to sort the entries, if:
125 * Sequential writes, or
126 * Random writes that lay out the file as it goes along
128 * For both these cases, just reading back data in the order we
129 * wrote it out is the fastest.
131 if (!td_random(td) || !td->o.overwrite ||
132 (io_u->file->flags & FIO_FILE_NOSORT)) {
133 INIT_LIST_HEAD(&ipo->list);
134 list_add_tail(&ipo->list, &td->io_hist_list);
138 RB_CLEAR_NODE(&ipo->rb_node);
139 p = &td->io_hist_tree.rb_node;
143 * Sort the entry into the verification list
148 __ipo = rb_entry(parent, struct io_piece, rb_node);
149 if (ipo->offset <= __ipo->offset)
155 rb_link_node(&ipo->rb_node, parent, p);
156 rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
159 void write_iolog_close(struct thread_data *td)
165 td->iolog_buf = NULL;
169 * Read version 2 iolog data. It is enhanced to include per-file logging,
172 static int read_iolog2(struct thread_data *td, FILE *f)
174 unsigned long long offset;
176 int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
181 free_release_files(td);
184 * Read in the read iolog and store it, reuse the infrastructure
185 * for doing verifications.
188 fname = malloc(256+16);
189 act = malloc(256+16);
192 while ((p = fgets(str, 4096, f)) != NULL) {
193 struct io_piece *ipo;
196 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
201 if (!strcmp(act, "read"))
203 else if (!strcmp(act, "write"))
205 else if (!strcmp(act, "sync"))
208 log_err("fio: bad iolog file action: %s\n",act);
213 if (!strcmp(act, "add")) {
215 fileno = add_file(td, fname);
216 file_action = FIO_LOG_ADD_FILE;
218 } else if (!strcmp(act, "open")) {
219 fileno = get_fileno(td, fname);
220 file_action = FIO_LOG_OPEN_FILE;
221 } else if (!strcmp(act, "close")) {
222 fileno = get_fileno(td, fname);
223 file_action = FIO_LOG_CLOSE_FILE;
225 log_err("fio: bad iolog file action: %s\n",act);
229 log_err("bad iolog2: %s", p);
235 else if (rw == DDIR_WRITE)
237 else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
238 log_err("bad ddir: %d\n", rw);
245 ipo = malloc(sizeof(*ipo));
246 memset(ipo, 0, sizeof(*ipo));
247 INIT_LIST_HEAD(&ipo->list);
248 ipo->offset = offset;
251 if (bytes > td->o.max_bs[rw])
252 td->o.max_bs[rw] = bytes;
253 if (rw == DDIR_INVAL) {
254 ipo->fileno = fileno;
255 ipo->file_action = file_action;
257 list_add_tail(&ipo->list, &td->io_log_list);
264 if (!reads && !writes)
266 else if (reads && !writes)
267 td->o.td_ddir = TD_DDIR_READ;
268 else if (!reads && writes)
269 td->o.td_ddir = TD_DDIR_WRITE;
271 td->o.td_ddir = TD_DDIR_RW;
277 * Read version 1 iolog data.
279 static int read_iolog(struct thread_data *td, FILE *f)
281 unsigned long long offset;
284 int rw, reads, writes;
287 * Read in the read iolog and store it, reuse the infrastructure
288 * for doing verifications.
292 while ((p = fgets(str, 4096, f)) != NULL) {
293 struct io_piece *ipo;
295 if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
296 log_err("bad iolog: %s\n", p);
301 else if (rw == DDIR_WRITE)
303 else if (rw != DDIR_SYNC) {
304 log_err("bad ddir: %d\n", rw);
308 ipo = malloc(sizeof(*ipo));
309 memset(ipo, 0, sizeof(*ipo));
310 INIT_LIST_HEAD(&ipo->list);
311 ipo->offset = offset;
313 ipo->ddir = (enum fio_ddir) rw;
314 if (bytes > td->o.max_bs[rw])
315 td->o.max_bs[rw] = bytes;
316 list_add_tail(&ipo->list, &td->io_log_list);
321 if (!reads && !writes)
323 else if (reads && !writes)
324 td->o.td_ddir = TD_DDIR_READ;
325 else if (!reads && writes)
326 td->o.td_ddir = TD_DDIR_WRITE;
328 td->o.td_ddir = TD_DDIR_RW;
334 * open iolog, check version, and call appropriate parser
336 static int init_iolog_read(struct thread_data *td)
338 char buffer[256], *p;
342 f = fopen(td->o.read_iolog_file, "r");
344 perror("fopen read iolog");
348 p = fgets(buffer, sizeof(buffer), f);
350 td_verror(td, errno, "iolog read");
351 log_err("fio: unable to read iolog\n");
356 * version 2 of the iolog stores a specific string as the
357 * first line, check for that
359 if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
360 ret = read_iolog2(td, f);
363 * seek back to the beginning
365 if (fseek(f, 0, SEEK_SET) < 0) {
366 td_verror(td, errno, "iolog read");
367 log_err("fio: unable to read iolog\n");
371 ret = read_iolog(td, f);
379 * Setup a log for storing io patterns.
381 static int init_iolog_write(struct thread_data *td)
387 f = fopen(td->o.write_iolog_file, "w+");
389 perror("fopen write iolog");
394 * That's it for writing, setup a log buffer and we're done.
397 td->iolog_buf = malloc(8192);
398 setvbuf(f, td->iolog_buf, _IOFBF, 8192);
401 * write our version line
403 if (fprintf(f, "%s\n", iolog_ver2) < 0) {
404 perror("iolog init\n");
409 * add all known files
411 for_each_file(td, ff, i)
412 log_file(td, ff, FIO_LOG_ADD_FILE);
417 int init_iolog(struct thread_data *td)
421 if (td->io_ops->flags & FIO_DISKLESSIO)
424 if (td->o.read_iolog_file) {
426 * Check if it's a blktrace file and load that if possible.
427 * Otherwise assume it's a normal log file and load that.
429 if (is_blktrace(td->o.read_iolog_file))
430 ret = load_blktrace(td, td->o.read_iolog_file);
432 ret = init_iolog_read(td);
433 } else if (td->o.write_iolog_file)
434 ret = init_iolog_write(td);
439 void setup_log(struct io_log **log)
441 struct io_log *l = malloc(sizeof(*l));
444 l->max_samples = 1024;
445 l->log = malloc(l->max_samples * sizeof(struct io_sample));
449 void __finish_log(struct io_log *log, const char *name)
454 f = fopen(name, "w");
460 for (i = 0; i < log->nr_samples; i++)
461 fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val, log->log[i].ddir);
468 void finish_log(struct thread_data *td, struct io_log *log, const char *name)
472 snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
473 __finish_log(log, file_name);