Commit | Line | Data |
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ba8fb6f6 VF |
1 | #include <stdlib.h> |
2 | ||
16e56d25 VF |
3 | #include "fio.h" |
4 | #include "steadystate.h" | |
16e56d25 | 5 | |
84784e07 | 6 | bool steadystate_enabled = false; |
4cd5b75b | 7 | |
c27cc65f JA |
8 | void steadystate_free(struct thread_data *td) |
9 | { | |
10 | free(td->ss.iops_data); | |
11 | free(td->ss.bw_data); | |
12 | td->ss.iops_data = NULL; | |
13 | td->ss.bw_data = NULL; | |
14 | } | |
15 | ||
f0c50c66 JA |
16 | static void steadystate_alloc(struct thread_data *td) |
17 | { | |
4c14c109 TK |
18 | td->ss.bw_data = calloc(td->ss.dur, sizeof(uint64_t)); |
19 | td->ss.iops_data = calloc(td->ss.dur, sizeof(uint64_t)); | |
bb49c8bd | 20 | |
c8caba48 | 21 | td->ss.state |= FIO_SS_DATA; |
f0c50c66 JA |
22 | } |
23 | ||
4cd5b75b | 24 | void steadystate_setup(void) |
16e56d25 | 25 | { |
da8f124f H |
26 | struct thread_data *prev_td; |
27 | int prev_groupid; | |
16e56d25 | 28 | |
84784e07 | 29 | if (!steadystate_enabled) |
16e56d25 VF |
30 | return; |
31 | ||
32 | /* | |
33 | * if group reporting is enabled, identify the last td | |
34 | * for each group and use it for storing steady state | |
35 | * data | |
36 | */ | |
37 | prev_groupid = -1; | |
38 | prev_td = NULL; | |
da8f124f | 39 | for_each_td(td) { |
bb49c8bd | 40 | if (!td->ss.dur) |
ba8fb6f6 VF |
41 | continue; |
42 | ||
43 | if (!td->o.group_reporting) { | |
44 | steadystate_alloc(td); | |
16e56d25 | 45 | continue; |
ba8fb6f6 | 46 | } |
16e56d25 VF |
47 | |
48 | if (prev_groupid != td->groupid) { | |
af7fb4aa | 49 | if (prev_td) |
ba8fb6f6 | 50 | steadystate_alloc(prev_td); |
16e56d25 VF |
51 | prev_groupid = td->groupid; |
52 | } | |
53 | prev_td = td; | |
da8f124f | 54 | } end_for_each(); |
16e56d25 | 55 | |
af7fb4aa | 56 | if (prev_td && prev_td->o.group_reporting) |
ba8fb6f6 | 57 | steadystate_alloc(prev_td); |
ba8fb6f6 VF |
58 | } |
59 | ||
9d193019 | 60 | static bool steadystate_slope(uint64_t iops, uint64_t bw, |
4cd5b75b | 61 | struct thread_data *td) |
16e56d25 | 62 | { |
ba8fb6f6 | 63 | int i, j; |
16e56d25 | 64 | double result; |
16e56d25 | 65 | struct steadystate_data *ss = &td->ss; |
9d193019 | 66 | uint64_t new_val; |
16e56d25 | 67 | |
ba8fb6f6 VF |
68 | ss->bw_data[ss->tail] = bw; |
69 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 70 | |
c8caba48 | 71 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
72 | new_val = iops; |
73 | else | |
74 | new_val = bw; | |
75 | ||
c8caba48 JA |
76 | if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
77 | if (!(ss->state & FIO_SS_BUFFER_FULL)) { | |
17df7023 VF |
78 | /* first time through */ |
79 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) { | |
c8caba48 | 80 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
81 | ss->sum_y += ss->iops_data[i]; |
82 | else | |
83 | ss->sum_y += ss->bw_data[i]; | |
17df7023 | 84 | j = (ss->head + i) % ss->dur; |
c8caba48 | 85 | if (ss->state & FIO_SS_IOPS) |
94f218f6 | 86 | ss->sum_xy += i * ss->iops_data[j]; |
7be78a8a | 87 | else |
94f218f6 | 88 | ss->sum_xy += i * ss->bw_data[j]; |
16e56d25 | 89 | } |
c8caba48 | 90 | ss->state |= FIO_SS_BUFFER_FULL; |
16e56d25 VF |
91 | } else { /* easy to update the sums */ |
92 | ss->sum_y -= ss->oldest_y; | |
ba8fb6f6 VF |
93 | ss->sum_y += new_val; |
94 | ss->sum_xy = ss->sum_xy - ss->sum_y + ss->dur * new_val; | |
16e56d25 VF |
95 | } |
96 | ||
c8caba48 | 97 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
98 | ss->oldest_y = ss->iops_data[ss->head]; |
99 | else | |
100 | ss->oldest_y = ss->bw_data[ss->head]; | |
16e56d25 VF |
101 | |
102 | /* | |
7be78a8a JA |
103 | * calculate slope as (sum_xy - sum_x * sum_y / n) / (sum_(x^2) |
104 | * - (sum_x)^2 / n) This code assumes that all x values are | |
105 | * equally spaced when they are often off by a few milliseconds. | |
106 | * This assumption greatly simplifies the calculations. | |
16e56d25 | 107 | */ |
7be78a8a JA |
108 | ss->slope = (ss->sum_xy - (double) ss->sum_x * ss->sum_y / ss->dur) / |
109 | (ss->sum_x_sq - (double) ss->sum_x * ss->sum_x / ss->dur); | |
c8caba48 | 110 | if (ss->state & FIO_SS_PCT) |
7be78a8a JA |
111 | ss->criterion = 100.0 * ss->slope / (ss->sum_y / ss->dur); |
112 | else | |
113 | ss->criterion = ss->slope; | |
16e56d25 | 114 | |
7be78a8a JA |
115 | dprint(FD_STEADYSTATE, "sum_y: %llu, sum_xy: %llu, slope: %f, " |
116 | "criterion: %f, limit: %f\n", | |
9d193019 VF |
117 | (unsigned long long) ss->sum_y, |
118 | (unsigned long long) ss->sum_xy, | |
119 | ss->slope, ss->criterion, ss->limit); | |
16e56d25 | 120 | |
6da94b07 | 121 | result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0); |
16e56d25 VF |
122 | if (result < ss->limit) |
123 | return true; | |
124 | } | |
125 | ||
126 | ss->tail = (ss->tail + 1) % ss->dur; | |
127 | if (ss->tail <= ss->head) | |
128 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 129 | |
16e56d25 VF |
130 | return false; |
131 | } | |
132 | ||
9d193019 | 133 | static bool steadystate_deviation(uint64_t iops, uint64_t bw, |
4cd5b75b | 134 | struct thread_data *td) |
16e56d25 VF |
135 | { |
136 | int i; | |
137 | double diff; | |
138 | double mean; | |
16e56d25 VF |
139 | |
140 | struct steadystate_data *ss = &td->ss; | |
141 | ||
ba8fb6f6 VF |
142 | ss->bw_data[ss->tail] = bw; |
143 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 144 | |
c8caba48 JA |
145 | if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
146 | if (!(ss->state & FIO_SS_BUFFER_FULL)) { | |
17df7023 VF |
147 | /* first time through */ |
148 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) | |
c8caba48 | 149 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
150 | ss->sum_y += ss->iops_data[i]; |
151 | else | |
152 | ss->sum_y += ss->bw_data[i]; | |
c8caba48 | 153 | ss->state |= FIO_SS_BUFFER_FULL; |
16e56d25 VF |
154 | } else { /* easy to update the sum */ |
155 | ss->sum_y -= ss->oldest_y; | |
c8caba48 | 156 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
157 | ss->sum_y += ss->iops_data[ss->tail]; |
158 | else | |
159 | ss->sum_y += ss->bw_data[ss->tail]; | |
16e56d25 VF |
160 | } |
161 | ||
c8caba48 | 162 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
163 | ss->oldest_y = ss->iops_data[ss->head]; |
164 | else | |
165 | ss->oldest_y = ss->bw_data[ss->head]; | |
166 | ||
16e56d25 | 167 | mean = (double) ss->sum_y / ss->dur; |
ba8fb6f6 | 168 | ss->deviation = 0.0; |
16e56d25 | 169 | |
4cd5b75b | 170 | for (i = 0; i < ss->dur; i++) { |
c8caba48 | 171 | if (ss->state & FIO_SS_IOPS) |
7be78a8a JA |
172 | diff = ss->iops_data[i] - mean; |
173 | else | |
174 | diff = ss->bw_data[i] - mean; | |
6da94b07 | 175 | ss->deviation = max(ss->deviation, diff * (diff < 0.0 ? -1.0 : 1.0)); |
16e56d25 VF |
176 | } |
177 | ||
c8caba48 | 178 | if (ss->state & FIO_SS_PCT) |
7be78a8a JA |
179 | ss->criterion = 100.0 * ss->deviation / mean; |
180 | else | |
181 | ss->criterion = ss->deviation; | |
16e56d25 | 182 | |
7be78a8a JA |
183 | dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, " |
184 | "objective: %f, limit: %f\n", | |
9d193019 VF |
185 | (unsigned long long) ss->sum_y, mean, |
186 | ss->deviation, ss->criterion, ss->limit); | |
16e56d25 VF |
187 | |
188 | if (ss->criterion < ss->limit) | |
189 | return true; | |
190 | } | |
191 | ||
192 | ss->tail = (ss->tail + 1) % ss->dur; | |
193 | if (ss->tail <= ss->head) | |
194 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 195 | |
16e56d25 VF |
196 | return false; |
197 | } | |
4cd5b75b | 198 | |
966f8ef9 | 199 | int steadystate_check(void) |
4cd5b75b | 200 | { |
da8f124f | 201 | int ddir, prev_groupid, group_ramp_time_over = 0; |
4cd5b75b | 202 | unsigned long rate_time; |
8b6a404c | 203 | struct timespec now; |
9d193019 VF |
204 | uint64_t group_bw = 0, group_iops = 0; |
205 | uint64_t td_iops, td_bytes; | |
4cd5b75b JA |
206 | bool ret; |
207 | ||
208 | prev_groupid = -1; | |
da8f124f | 209 | for_each_td(td) { |
26b3a188 | 210 | const bool needs_lock = td_async_processing(td); |
4cd5b75b JA |
211 | struct steadystate_data *ss = &td->ss; |
212 | ||
7be78a8a | 213 | if (!ss->dur || td->runstate <= TD_SETTING_UP || |
0c13c969 | 214 | td->runstate >= TD_EXITED || !ss->state || |
c8caba48 | 215 | ss->state & FIO_SS_ATTAINED) |
4cd5b75b JA |
216 | continue; |
217 | ||
218 | td_iops = 0; | |
219 | td_bytes = 0; | |
220 | if (!td->o.group_reporting || | |
221 | (td->o.group_reporting && td->groupid != prev_groupid)) { | |
222 | group_bw = 0; | |
223 | group_iops = 0; | |
224 | group_ramp_time_over = 0; | |
225 | } | |
226 | prev_groupid = td->groupid; | |
227 | ||
228 | fio_gettime(&now, NULL); | |
c8caba48 | 229 | if (ss->ramp_time && !(ss->state & FIO_SS_RAMP_OVER)) { |
4cd5b75b JA |
230 | /* |
231 | * Begin recording data one second after ss->ramp_time | |
232 | * has elapsed | |
233 | */ | |
234 | if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L)) | |
c8caba48 | 235 | ss->state |= FIO_SS_RAMP_OVER; |
5b4b6586 | 236 | } |
4cd5b75b | 237 | |
26b3a188 JA |
238 | if (needs_lock) |
239 | __td_io_u_lock(td); | |
240 | ||
c1f50f76 | 241 | for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) { |
4cd5b75b JA |
242 | td_iops += td->io_blocks[ddir]; |
243 | td_bytes += td->io_bytes[ddir]; | |
244 | } | |
26b3a188 JA |
245 | |
246 | if (needs_lock) | |
247 | __td_io_u_unlock(td); | |
4cd5b75b JA |
248 | |
249 | rate_time = mtime_since(&ss->prev_time, &now); | |
250 | memcpy(&ss->prev_time, &now, sizeof(now)); | |
251 | ||
c8caba48 | 252 | if (ss->state & FIO_SS_RAMP_OVER) { |
4cd5b75b JA |
253 | group_bw += 1000 * (td_bytes - ss->prev_bytes) / rate_time; |
254 | group_iops += 1000 * (td_iops - ss->prev_iops) / rate_time; | |
255 | ++group_ramp_time_over; | |
256 | } | |
257 | ss->prev_iops = td_iops; | |
258 | ss->prev_bytes = td_bytes; | |
259 | ||
c8caba48 | 260 | if (td->o.group_reporting && !(ss->state & FIO_SS_DATA)) |
4cd5b75b JA |
261 | continue; |
262 | ||
7be78a8a JA |
263 | /* |
264 | * Don't begin checking criterion until ss->ramp_time is over | |
265 | * for at least one thread in group | |
266 | */ | |
4cd5b75b JA |
267 | if (!group_ramp_time_over) |
268 | continue; | |
269 | ||
7be78a8a JA |
270 | dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, " |
271 | "groupid: %u, rate_msec: %ld, " | |
9d193019 | 272 | "iops: %llu, bw: %llu, head: %d, tail: %d\n", |
da8f124f | 273 | __td_index, td->groupid, rate_time, |
9d193019 VF |
274 | (unsigned long long) group_iops, |
275 | (unsigned long long) group_bw, | |
276 | ss->head, ss->tail); | |
4cd5b75b | 277 | |
c8caba48 | 278 | if (ss->state & FIO_SS_SLOPE) |
4cd5b75b JA |
279 | ret = steadystate_slope(group_iops, group_bw, td); |
280 | else | |
281 | ret = steadystate_deviation(group_iops, group_bw, td); | |
282 | ||
283 | if (ret) { | |
284 | if (td->o.group_reporting) { | |
da8f124f | 285 | for_each_td(td2) { |
4cd5b75b | 286 | if (td2->groupid == td->groupid) { |
c8caba48 | 287 | td2->ss.state |= FIO_SS_ATTAINED; |
4cd5b75b JA |
288 | fio_mark_td_terminate(td2); |
289 | } | |
da8f124f | 290 | } end_for_each(); |
4cd5b75b | 291 | } else { |
c8caba48 | 292 | ss->state |= FIO_SS_ATTAINED; |
4cd5b75b JA |
293 | fio_mark_td_terminate(td); |
294 | } | |
295 | } | |
da8f124f | 296 | } end_for_each(); |
966f8ef9 | 297 | return 0; |
4cd5b75b JA |
298 | } |
299 | ||
56a90eba | 300 | int td_steadystate_init(struct thread_data *td) |
f0c50c66 JA |
301 | { |
302 | struct steadystate_data *ss = &td->ss; | |
303 | struct thread_options *o = &td->o; | |
304 | ||
305 | memset(ss, 0, sizeof(*ss)); | |
306 | ||
56a90eba VF |
307 | if (o->ss_dur) { |
308 | steadystate_enabled = true; | |
309 | o->ss_dur /= 1000000L; | |
310 | ||
311 | /* put all steady state info in one place */ | |
312 | ss->dur = o->ss_dur; | |
313 | ss->limit = o->ss_limit.u.f; | |
314 | ss->ramp_time = o->ss_ramp_time; | |
f0c50c66 | 315 | |
2c5d94bc | 316 | ss->state = o->ss_state; |
56a90eba | 317 | if (!td->ss.ramp_time) |
c8caba48 | 318 | ss->state |= FIO_SS_RAMP_OVER; |
4cd5b75b | 319 | |
56a90eba VF |
320 | ss->sum_x = o->ss_dur * (o->ss_dur - 1) / 2; |
321 | ss->sum_x_sq = (o->ss_dur - 1) * (o->ss_dur) * (2*o->ss_dur - 1) / 6; | |
56a90eba | 322 | } |
5b4b6586 | 323 | |
56a90eba | 324 | /* make sure that ss options are consistent within reporting group */ |
da8f124f | 325 | for_each_td(td2) { |
56a90eba VF |
326 | if (td2->groupid == td->groupid) { |
327 | struct steadystate_data *ss2 = &td2->ss; | |
328 | ||
329 | if (ss2->dur != ss->dur || | |
330 | ss2->limit != ss->limit || | |
331 | ss2->ramp_time != ss->ramp_time || | |
56a90eba VF |
332 | ss2->state != ss->state || |
333 | ss2->sum_x != ss->sum_x || | |
334 | ss2->sum_x_sq != ss->sum_x_sq) { | |
335 | td_verror(td, EINVAL, "job rejected: steadystate options must be consistent within reporting groups"); | |
336 | return 1; | |
337 | } | |
338 | } | |
da8f124f | 339 | } end_for_each(); |
f0c50c66 | 340 | |
56a90eba | 341 | return 0; |
f0c50c66 | 342 | } |
d685adfb | 343 | |
9d193019 | 344 | uint64_t steadystate_bw_mean(struct thread_stat *ts) |
d685adfb VF |
345 | { |
346 | int i; | |
9d193019 | 347 | uint64_t sum; |
d685adfb | 348 | |
9fac0db7 JA |
349 | if (!ts->ss_dur) |
350 | return 0; | |
351 | ||
bb49c8bd VF |
352 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
353 | sum += ts->ss_bw_data[i]; | |
d685adfb | 354 | |
bb49c8bd | 355 | return sum / ts->ss_dur; |
d685adfb VF |
356 | } |
357 | ||
9d193019 | 358 | uint64_t steadystate_iops_mean(struct thread_stat *ts) |
d685adfb VF |
359 | { |
360 | int i; | |
9d193019 | 361 | uint64_t sum; |
d685adfb | 362 | |
9fac0db7 JA |
363 | if (!ts->ss_dur) |
364 | return 0; | |
365 | ||
bb49c8bd VF |
366 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
367 | sum += ts->ss_iops_data[i]; | |
d685adfb | 368 | |
bb49c8bd | 369 | return sum / ts->ss_dur; |
d685adfb | 370 | } |