Commit | Line | Data |
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ba8fb6f6 VF |
1 | #include <stdlib.h> |
2 | ||
16e56d25 VF |
3 | #include "fio.h" |
4 | #include "steadystate.h" | |
5 | #include "helper_thread.h" | |
6 | ||
84784e07 | 7 | bool steadystate_enabled = false; |
4cd5b75b | 8 | |
c27cc65f JA |
9 | void steadystate_free(struct thread_data *td) |
10 | { | |
11 | free(td->ss.iops_data); | |
12 | free(td->ss.bw_data); | |
13 | td->ss.iops_data = NULL; | |
14 | td->ss.bw_data = NULL; | |
15 | } | |
16 | ||
f0c50c66 JA |
17 | static void steadystate_alloc(struct thread_data *td) |
18 | { | |
4c14c109 TK |
19 | td->ss.bw_data = calloc(td->ss.dur, sizeof(uint64_t)); |
20 | td->ss.iops_data = calloc(td->ss.dur, sizeof(uint64_t)); | |
bb49c8bd | 21 | |
c8caba48 | 22 | td->ss.state |= FIO_SS_DATA; |
f0c50c66 JA |
23 | } |
24 | ||
4cd5b75b | 25 | void steadystate_setup(void) |
16e56d25 | 26 | { |
16e56d25 | 27 | struct thread_data *td, *prev_td; |
af7fb4aa | 28 | int i, prev_groupid; |
16e56d25 | 29 | |
84784e07 | 30 | if (!steadystate_enabled) |
16e56d25 VF |
31 | return; |
32 | ||
33 | /* | |
34 | * if group reporting is enabled, identify the last td | |
35 | * for each group and use it for storing steady state | |
36 | * data | |
37 | */ | |
38 | prev_groupid = -1; | |
39 | prev_td = NULL; | |
40 | for_each_td(td, i) { | |
bb49c8bd | 41 | if (!td->ss.dur) |
ba8fb6f6 VF |
42 | continue; |
43 | ||
44 | if (!td->o.group_reporting) { | |
45 | steadystate_alloc(td); | |
16e56d25 | 46 | continue; |
ba8fb6f6 | 47 | } |
16e56d25 VF |
48 | |
49 | if (prev_groupid != td->groupid) { | |
af7fb4aa | 50 | if (prev_td) |
ba8fb6f6 | 51 | steadystate_alloc(prev_td); |
16e56d25 VF |
52 | prev_groupid = td->groupid; |
53 | } | |
54 | prev_td = td; | |
55 | } | |
56 | ||
af7fb4aa | 57 | if (prev_td && prev_td->o.group_reporting) |
ba8fb6f6 | 58 | steadystate_alloc(prev_td); |
ba8fb6f6 VF |
59 | } |
60 | ||
9d193019 | 61 | static bool steadystate_slope(uint64_t iops, uint64_t bw, |
4cd5b75b | 62 | struct thread_data *td) |
16e56d25 | 63 | { |
ba8fb6f6 | 64 | int i, j; |
16e56d25 | 65 | double result; |
16e56d25 | 66 | struct steadystate_data *ss = &td->ss; |
9d193019 | 67 | uint64_t new_val; |
16e56d25 | 68 | |
ba8fb6f6 VF |
69 | ss->bw_data[ss->tail] = bw; |
70 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 71 | |
c8caba48 | 72 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
73 | new_val = iops; |
74 | else | |
75 | new_val = bw; | |
76 | ||
c8caba48 JA |
77 | if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
78 | if (!(ss->state & FIO_SS_BUFFER_FULL)) { | |
17df7023 VF |
79 | /* first time through */ |
80 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) { | |
c8caba48 | 81 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
82 | ss->sum_y += ss->iops_data[i]; |
83 | else | |
84 | ss->sum_y += ss->bw_data[i]; | |
17df7023 | 85 | j = (ss->head + i) % ss->dur; |
c8caba48 | 86 | if (ss->state & FIO_SS_IOPS) |
94f218f6 | 87 | ss->sum_xy += i * ss->iops_data[j]; |
7be78a8a | 88 | else |
94f218f6 | 89 | ss->sum_xy += i * ss->bw_data[j]; |
16e56d25 | 90 | } |
c8caba48 | 91 | ss->state |= FIO_SS_BUFFER_FULL; |
16e56d25 VF |
92 | } else { /* easy to update the sums */ |
93 | ss->sum_y -= ss->oldest_y; | |
ba8fb6f6 VF |
94 | ss->sum_y += new_val; |
95 | ss->sum_xy = ss->sum_xy - ss->sum_y + ss->dur * new_val; | |
16e56d25 VF |
96 | } |
97 | ||
c8caba48 | 98 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
99 | ss->oldest_y = ss->iops_data[ss->head]; |
100 | else | |
101 | ss->oldest_y = ss->bw_data[ss->head]; | |
16e56d25 VF |
102 | |
103 | /* | |
7be78a8a JA |
104 | * calculate slope as (sum_xy - sum_x * sum_y / n) / (sum_(x^2) |
105 | * - (sum_x)^2 / n) This code assumes that all x values are | |
106 | * equally spaced when they are often off by a few milliseconds. | |
107 | * This assumption greatly simplifies the calculations. | |
16e56d25 | 108 | */ |
7be78a8a JA |
109 | ss->slope = (ss->sum_xy - (double) ss->sum_x * ss->sum_y / ss->dur) / |
110 | (ss->sum_x_sq - (double) ss->sum_x * ss->sum_x / ss->dur); | |
c8caba48 | 111 | if (ss->state & FIO_SS_PCT) |
7be78a8a JA |
112 | ss->criterion = 100.0 * ss->slope / (ss->sum_y / ss->dur); |
113 | else | |
114 | ss->criterion = ss->slope; | |
16e56d25 | 115 | |
7be78a8a JA |
116 | dprint(FD_STEADYSTATE, "sum_y: %llu, sum_xy: %llu, slope: %f, " |
117 | "criterion: %f, limit: %f\n", | |
9d193019 VF |
118 | (unsigned long long) ss->sum_y, |
119 | (unsigned long long) ss->sum_xy, | |
120 | ss->slope, ss->criterion, ss->limit); | |
16e56d25 | 121 | |
6da94b07 | 122 | result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0); |
16e56d25 VF |
123 | if (result < ss->limit) |
124 | return true; | |
125 | } | |
126 | ||
127 | ss->tail = (ss->tail + 1) % ss->dur; | |
128 | if (ss->tail <= ss->head) | |
129 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 130 | |
16e56d25 VF |
131 | return false; |
132 | } | |
133 | ||
9d193019 | 134 | static bool steadystate_deviation(uint64_t iops, uint64_t bw, |
4cd5b75b | 135 | struct thread_data *td) |
16e56d25 VF |
136 | { |
137 | int i; | |
138 | double diff; | |
139 | double mean; | |
16e56d25 VF |
140 | |
141 | struct steadystate_data *ss = &td->ss; | |
142 | ||
ba8fb6f6 VF |
143 | ss->bw_data[ss->tail] = bw; |
144 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 145 | |
c8caba48 JA |
146 | if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
147 | if (!(ss->state & FIO_SS_BUFFER_FULL)) { | |
17df7023 VF |
148 | /* first time through */ |
149 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) | |
c8caba48 | 150 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
151 | ss->sum_y += ss->iops_data[i]; |
152 | else | |
153 | ss->sum_y += ss->bw_data[i]; | |
c8caba48 | 154 | ss->state |= FIO_SS_BUFFER_FULL; |
16e56d25 VF |
155 | } else { /* easy to update the sum */ |
156 | ss->sum_y -= ss->oldest_y; | |
c8caba48 | 157 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
158 | ss->sum_y += ss->iops_data[ss->tail]; |
159 | else | |
160 | ss->sum_y += ss->bw_data[ss->tail]; | |
16e56d25 VF |
161 | } |
162 | ||
c8caba48 | 163 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
164 | ss->oldest_y = ss->iops_data[ss->head]; |
165 | else | |
166 | ss->oldest_y = ss->bw_data[ss->head]; | |
167 | ||
16e56d25 | 168 | mean = (double) ss->sum_y / ss->dur; |
ba8fb6f6 | 169 | ss->deviation = 0.0; |
16e56d25 | 170 | |
4cd5b75b | 171 | for (i = 0; i < ss->dur; i++) { |
c8caba48 | 172 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
173 | diff = ss->iops_data[i] - mean; |
174 | else | |
175 | diff = ss->bw_data[i] - mean; | |
6da94b07 | 176 | ss->deviation = max(ss->deviation, diff * (diff < 0.0 ? -1.0 : 1.0)); |
16e56d25 VF |
177 | } |
178 | ||
c8caba48 | 179 | if (ss->state & FIO_SS_PCT) |
7be78a8a JA |
180 | ss->criterion = 100.0 * ss->deviation / mean; |
181 | else | |
182 | ss->criterion = ss->deviation; | |
16e56d25 | 183 | |
7be78a8a JA |
184 | dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, " |
185 | "objective: %f, limit: %f\n", | |
9d193019 VF |
186 | (unsigned long long) ss->sum_y, mean, |
187 | ss->deviation, ss->criterion, ss->limit); | |
16e56d25 VF |
188 | |
189 | if (ss->criterion < ss->limit) | |
190 | return true; | |
191 | } | |
192 | ||
193 | ss->tail = (ss->tail + 1) % ss->dur; | |
194 | if (ss->tail <= ss->head) | |
195 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 196 | |
16e56d25 VF |
197 | return false; |
198 | } | |
4cd5b75b JA |
199 | |
200 | void steadystate_check(void) | |
201 | { | |
202 | int i, j, ddir, prev_groupid, group_ramp_time_over = 0; | |
203 | unsigned long rate_time; | |
204 | struct thread_data *td, *td2; | |
8b6a404c | 205 | struct timespec now; |
9d193019 VF |
206 | uint64_t group_bw = 0, group_iops = 0; |
207 | uint64_t td_iops, td_bytes; | |
4cd5b75b JA |
208 | bool ret; |
209 | ||
210 | prev_groupid = -1; | |
211 | for_each_td(td, i) { | |
212 | struct steadystate_data *ss = &td->ss; | |
213 | ||
7be78a8a | 214 | if (!ss->dur || td->runstate <= TD_SETTING_UP || |
0c13c969 | 215 | td->runstate >= TD_EXITED || !ss->state || |
c8caba48 | 216 | ss->state & FIO_SS_ATTAINED) |
4cd5b75b JA |
217 | continue; |
218 | ||
219 | td_iops = 0; | |
220 | td_bytes = 0; | |
221 | if (!td->o.group_reporting || | |
222 | (td->o.group_reporting && td->groupid != prev_groupid)) { | |
223 | group_bw = 0; | |
224 | group_iops = 0; | |
225 | group_ramp_time_over = 0; | |
226 | } | |
227 | prev_groupid = td->groupid; | |
228 | ||
229 | fio_gettime(&now, NULL); | |
c8caba48 | 230 | if (ss->ramp_time && !(ss->state & FIO_SS_RAMP_OVER)) { |
4cd5b75b JA |
231 | /* |
232 | * Begin recording data one second after ss->ramp_time | |
233 | * has elapsed | |
234 | */ | |
235 | if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L)) | |
c8caba48 | 236 | ss->state |= FIO_SS_RAMP_OVER; |
5b4b6586 | 237 | } |
4cd5b75b JA |
238 | |
239 | td_io_u_lock(td); | |
c1f50f76 | 240 | for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) { |
4cd5b75b JA |
241 | td_iops += td->io_blocks[ddir]; |
242 | td_bytes += td->io_bytes[ddir]; | |
243 | } | |
244 | td_io_u_unlock(td); | |
245 | ||
246 | rate_time = mtime_since(&ss->prev_time, &now); | |
247 | memcpy(&ss->prev_time, &now, sizeof(now)); | |
248 | ||
249 | /* | |
250 | * Begin monitoring when job starts but don't actually use | |
251 | * data in checking stopping criterion until ss->ramp_time is | |
252 | * over. This ensures that we will have a sane value in | |
253 | * prev_iops/bw the first time through after ss->ramp_time | |
254 | * is done. | |
255 | */ | |
c8caba48 | 256 | if (ss->state & FIO_SS_RAMP_OVER) { |
4cd5b75b JA |
257 | group_bw += 1000 * (td_bytes - ss->prev_bytes) / rate_time; |
258 | group_iops += 1000 * (td_iops - ss->prev_iops) / rate_time; | |
259 | ++group_ramp_time_over; | |
260 | } | |
261 | ss->prev_iops = td_iops; | |
262 | ss->prev_bytes = td_bytes; | |
263 | ||
c8caba48 | 264 | if (td->o.group_reporting && !(ss->state & FIO_SS_DATA)) |
4cd5b75b JA |
265 | continue; |
266 | ||
7be78a8a JA |
267 | /* |
268 | * Don't begin checking criterion until ss->ramp_time is over | |
269 | * for at least one thread in group | |
270 | */ | |
4cd5b75b JA |
271 | if (!group_ramp_time_over) |
272 | continue; | |
273 | ||
7be78a8a JA |
274 | dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, " |
275 | "groupid: %u, rate_msec: %ld, " | |
9d193019 VF |
276 | "iops: %llu, bw: %llu, head: %d, tail: %d\n", |
277 | i, td->groupid, rate_time, | |
278 | (unsigned long long) group_iops, | |
279 | (unsigned long long) group_bw, | |
280 | ss->head, ss->tail); | |
4cd5b75b | 281 | |
c8caba48 | 282 | if (ss->state & FIO_SS_SLOPE) |
4cd5b75b JA |
283 | ret = steadystate_slope(group_iops, group_bw, td); |
284 | else | |
285 | ret = steadystate_deviation(group_iops, group_bw, td); | |
286 | ||
287 | if (ret) { | |
288 | if (td->o.group_reporting) { | |
289 | for_each_td(td2, j) { | |
290 | if (td2->groupid == td->groupid) { | |
c8caba48 | 291 | td2->ss.state |= FIO_SS_ATTAINED; |
4cd5b75b JA |
292 | fio_mark_td_terminate(td2); |
293 | } | |
294 | } | |
295 | } else { | |
c8caba48 | 296 | ss->state |= FIO_SS_ATTAINED; |
4cd5b75b JA |
297 | fio_mark_td_terminate(td); |
298 | } | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
56a90eba | 303 | int td_steadystate_init(struct thread_data *td) |
f0c50c66 JA |
304 | { |
305 | struct steadystate_data *ss = &td->ss; | |
306 | struct thread_options *o = &td->o; | |
56a90eba VF |
307 | struct thread_data *td2; |
308 | int j; | |
f0c50c66 JA |
309 | |
310 | memset(ss, 0, sizeof(*ss)); | |
311 | ||
56a90eba VF |
312 | if (o->ss_dur) { |
313 | steadystate_enabled = true; | |
314 | o->ss_dur /= 1000000L; | |
315 | ||
316 | /* put all steady state info in one place */ | |
317 | ss->dur = o->ss_dur; | |
318 | ss->limit = o->ss_limit.u.f; | |
319 | ss->ramp_time = o->ss_ramp_time; | |
f0c50c66 | 320 | |
2c5d94bc | 321 | ss->state = o->ss_state; |
56a90eba | 322 | if (!td->ss.ramp_time) |
c8caba48 | 323 | ss->state |= FIO_SS_RAMP_OVER; |
4cd5b75b | 324 | |
56a90eba VF |
325 | ss->sum_x = o->ss_dur * (o->ss_dur - 1) / 2; |
326 | ss->sum_x_sq = (o->ss_dur - 1) * (o->ss_dur) * (2*o->ss_dur - 1) / 6; | |
56a90eba | 327 | } |
5b4b6586 | 328 | |
56a90eba VF |
329 | /* make sure that ss options are consistent within reporting group */ |
330 | for_each_td(td2, j) { | |
331 | if (td2->groupid == td->groupid) { | |
332 | struct steadystate_data *ss2 = &td2->ss; | |
333 | ||
334 | if (ss2->dur != ss->dur || | |
335 | ss2->limit != ss->limit || | |
336 | ss2->ramp_time != ss->ramp_time || | |
56a90eba VF |
337 | ss2->state != ss->state || |
338 | ss2->sum_x != ss->sum_x || | |
339 | ss2->sum_x_sq != ss->sum_x_sq) { | |
340 | td_verror(td, EINVAL, "job rejected: steadystate options must be consistent within reporting groups"); | |
341 | return 1; | |
342 | } | |
343 | } | |
344 | } | |
f0c50c66 | 345 | |
56a90eba | 346 | return 0; |
f0c50c66 | 347 | } |
d685adfb | 348 | |
9d193019 | 349 | uint64_t steadystate_bw_mean(struct thread_stat *ts) |
d685adfb VF |
350 | { |
351 | int i; | |
9d193019 | 352 | uint64_t sum; |
d685adfb | 353 | |
bb49c8bd VF |
354 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
355 | sum += ts->ss_bw_data[i]; | |
d685adfb | 356 | |
bb49c8bd | 357 | return sum / ts->ss_dur; |
d685adfb VF |
358 | } |
359 | ||
9d193019 | 360 | uint64_t steadystate_iops_mean(struct thread_stat *ts) |
d685adfb VF |
361 | { |
362 | int i; | |
9d193019 | 363 | uint64_t sum; |
d685adfb | 364 | |
bb49c8bd VF |
365 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
366 | sum += ts->ss_iops_data[i]; | |
d685adfb | 367 | |
bb49c8bd | 368 | return sum / ts->ss_dur; |
d685adfb | 369 | } |