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 | |
f0c50c66 JA |
9 | static void steadystate_alloc(struct thread_data *td) |
10 | { | |
11 | int i; | |
12 | ||
bb49c8bd VF |
13 | td->ss.bw_data = malloc(td->ss.dur * sizeof(uint64_t)); |
14 | td->ss.iops_data = malloc(td->ss.dur * sizeof(uint64_t)); | |
f0c50c66 JA |
15 | /* initialize so that it is obvious if the cache is not full in the output */ |
16 | for (i = 0; i < td->ss.dur; i++) | |
17 | td->ss.iops_data[i] = td->ss.bw_data[i] = 0; | |
bb49c8bd VF |
18 | |
19 | td->ss.state |= __FIO_SS_DATA; | |
f0c50c66 JA |
20 | } |
21 | ||
4cd5b75b | 22 | void steadystate_setup(void) |
16e56d25 VF |
23 | { |
24 | int i, prev_groupid; | |
25 | struct thread_data *td, *prev_td; | |
26 | ||
84784e07 | 27 | if (!steadystate_enabled) |
16e56d25 VF |
28 | return; |
29 | ||
30 | /* | |
31 | * if group reporting is enabled, identify the last td | |
32 | * for each group and use it for storing steady state | |
33 | * data | |
34 | */ | |
35 | prev_groupid = -1; | |
36 | prev_td = NULL; | |
37 | for_each_td(td, i) { | |
bb49c8bd | 38 | if (!td->ss.dur) |
ba8fb6f6 VF |
39 | continue; |
40 | ||
41 | if (!td->o.group_reporting) { | |
42 | steadystate_alloc(td); | |
16e56d25 | 43 | continue; |
ba8fb6f6 | 44 | } |
16e56d25 VF |
45 | |
46 | if (prev_groupid != td->groupid) { | |
ba8fb6f6 | 47 | if (prev_td != NULL) { |
ba8fb6f6 VF |
48 | steadystate_alloc(prev_td); |
49 | } | |
16e56d25 VF |
50 | prev_groupid = td->groupid; |
51 | } | |
52 | prev_td = td; | |
53 | } | |
54 | ||
ba8fb6f6 | 55 | if (prev_td != NULL && prev_td->o.group_reporting) { |
ba8fb6f6 VF |
56 | steadystate_alloc(prev_td); |
57 | } | |
58 | } | |
59 | ||
4cd5b75b JA |
60 | static bool steadystate_slope(unsigned long iops, unsigned long bw, |
61 | struct thread_data *td) | |
16e56d25 | 62 | { |
ba8fb6f6 | 63 | int i, j; |
16e56d25 | 64 | double result; |
16e56d25 | 65 | struct steadystate_data *ss = &td->ss; |
7be78a8a | 66 | unsigned long new_val; |
16e56d25 | 67 | |
ba8fb6f6 VF |
68 | ss->bw_data[ss->tail] = bw; |
69 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 70 | |
5b4b6586 | 71 | if (ss->state & __FIO_SS_IOPS) |
7be78a8a JA |
72 | new_val = iops; |
73 | else | |
74 | new_val = bw; | |
75 | ||
17df7023 VF |
76 | if (ss->state & __FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
77 | if (!(ss->state & __FIO_SS_BUFFER_FULL)) { | |
78 | /* first time through */ | |
79 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) { | |
5b4b6586 | 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; |
5b4b6586 | 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 | } |
17df7023 | 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 | ||
5b4b6586 | 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); | |
e6a6a984 | 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", | |
117 | ss->sum_y, ss->sum_xy, ss->slope, | |
118 | ss->criterion, ss->limit); | |
16e56d25 | 119 | |
6da94b07 | 120 | result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0); |
16e56d25 VF |
121 | if (result < ss->limit) |
122 | return true; | |
123 | } | |
124 | ||
125 | ss->tail = (ss->tail + 1) % ss->dur; | |
126 | if (ss->tail <= ss->head) | |
127 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 128 | |
16e56d25 VF |
129 | return false; |
130 | } | |
131 | ||
4cd5b75b JA |
132 | static bool steadystate_deviation(unsigned long iops, unsigned long bw, |
133 | struct thread_data *td) | |
16e56d25 VF |
134 | { |
135 | int i; | |
136 | double diff; | |
137 | double mean; | |
16e56d25 VF |
138 | |
139 | struct steadystate_data *ss = &td->ss; | |
140 | ||
ba8fb6f6 VF |
141 | ss->bw_data[ss->tail] = bw; |
142 | ss->iops_data[ss->tail] = iops; | |
16e56d25 | 143 | |
17df7023 VF |
144 | if (ss->state & __FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) { |
145 | if (!(ss->state & __FIO_SS_BUFFER_FULL)) { | |
146 | /* first time through */ | |
147 | for(i = 0, ss->sum_y = 0; i < ss->dur; i++) | |
5b4b6586 | 148 | if (ss->state & __FIO_SS_IOPS) |
7be78a8a JA |
149 | ss->sum_y += ss->iops_data[i]; |
150 | else | |
151 | ss->sum_y += ss->bw_data[i]; | |
17df7023 | 152 | ss->state |= __FIO_SS_BUFFER_FULL; |
16e56d25 VF |
153 | } else { /* easy to update the sum */ |
154 | ss->sum_y -= ss->oldest_y; | |
5b4b6586 | 155 | if (ss->state & __FIO_SS_IOPS) |
7be78a8a JA |
156 | ss->sum_y += ss->iops_data[ss->tail]; |
157 | else | |
158 | ss->sum_y += ss->bw_data[ss->tail]; | |
16e56d25 VF |
159 | } |
160 | ||
5b4b6586 | 161 | if (ss->state & __FIO_SS_IOPS) |
7be78a8a JA |
162 | ss->oldest_y = ss->iops_data[ss->head]; |
163 | else | |
164 | ss->oldest_y = ss->bw_data[ss->head]; | |
165 | ||
16e56d25 | 166 | mean = (double) ss->sum_y / ss->dur; |
ba8fb6f6 | 167 | ss->deviation = 0.0; |
16e56d25 | 168 | |
4cd5b75b | 169 | for (i = 0; i < ss->dur; i++) { |
5b4b6586 | 170 | if (ss->state & __FIO_SS_IOPS) |
7be78a8a JA |
171 | diff = ss->iops_data[i] - mean; |
172 | else | |
173 | diff = ss->bw_data[i] - mean; | |
6da94b07 | 174 | ss->deviation = max(ss->deviation, diff * (diff < 0.0 ? -1.0 : 1.0)); |
16e56d25 VF |
175 | } |
176 | ||
e6a6a984 | 177 | if (ss->state & __FIO_SS_PCT) |
7be78a8a JA |
178 | ss->criterion = 100.0 * ss->deviation / mean; |
179 | else | |
180 | ss->criterion = ss->deviation; | |
16e56d25 | 181 | |
7be78a8a JA |
182 | dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, " |
183 | "objective: %f, limit: %f\n", | |
184 | ss->sum_y, mean, ss->deviation, | |
185 | ss->criterion, ss->limit); | |
16e56d25 VF |
186 | |
187 | if (ss->criterion < ss->limit) | |
188 | return true; | |
189 | } | |
190 | ||
191 | ss->tail = (ss->tail + 1) % ss->dur; | |
192 | if (ss->tail <= ss->head) | |
193 | ss->head = (ss->head + 1) % ss->dur; | |
4cd5b75b | 194 | |
16e56d25 VF |
195 | return false; |
196 | } | |
4cd5b75b JA |
197 | |
198 | void steadystate_check(void) | |
199 | { | |
200 | int i, j, ddir, prev_groupid, group_ramp_time_over = 0; | |
201 | unsigned long rate_time; | |
202 | struct thread_data *td, *td2; | |
203 | struct timeval now; | |
204 | unsigned long group_bw = 0, group_iops = 0; | |
205 | unsigned long long td_iops; | |
206 | unsigned long long td_bytes; | |
207 | bool ret; | |
208 | ||
209 | prev_groupid = -1; | |
210 | for_each_td(td, i) { | |
211 | struct steadystate_data *ss = &td->ss; | |
212 | ||
7be78a8a | 213 | if (!ss->dur || td->runstate <= TD_SETTING_UP || |
5b4b6586 | 214 | td->runstate >= TD_EXITED || (ss->state & __FIO_SS_ATTAINED)) |
4cd5b75b JA |
215 | continue; |
216 | ||
217 | td_iops = 0; | |
218 | td_bytes = 0; | |
219 | if (!td->o.group_reporting || | |
220 | (td->o.group_reporting && td->groupid != prev_groupid)) { | |
221 | group_bw = 0; | |
222 | group_iops = 0; | |
223 | group_ramp_time_over = 0; | |
224 | } | |
225 | prev_groupid = td->groupid; | |
226 | ||
227 | fio_gettime(&now, NULL); | |
5b4b6586 | 228 | if (ss->ramp_time && !(ss->state & __FIO_SS_RAMP_OVER)) { |
4cd5b75b JA |
229 | /* |
230 | * Begin recording data one second after ss->ramp_time | |
231 | * has elapsed | |
232 | */ | |
233 | if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L)) | |
5b4b6586 JA |
234 | ss->state |= __FIO_SS_RAMP_OVER; |
235 | } | |
4cd5b75b JA |
236 | |
237 | td_io_u_lock(td); | |
238 | for (ddir = DDIR_READ; ddir < DDIR_RWDIR_CNT; ddir++) { | |
239 | td_iops += td->io_blocks[ddir]; | |
240 | td_bytes += td->io_bytes[ddir]; | |
241 | } | |
242 | td_io_u_unlock(td); | |
243 | ||
244 | rate_time = mtime_since(&ss->prev_time, &now); | |
245 | memcpy(&ss->prev_time, &now, sizeof(now)); | |
246 | ||
247 | /* | |
248 | * Begin monitoring when job starts but don't actually use | |
249 | * data in checking stopping criterion until ss->ramp_time is | |
250 | * over. This ensures that we will have a sane value in | |
251 | * prev_iops/bw the first time through after ss->ramp_time | |
252 | * is done. | |
253 | */ | |
5b4b6586 | 254 | if (ss->state & __FIO_SS_RAMP_OVER) { |
4cd5b75b JA |
255 | group_bw += 1000 * (td_bytes - ss->prev_bytes) / rate_time; |
256 | group_iops += 1000 * (td_iops - ss->prev_iops) / rate_time; | |
257 | ++group_ramp_time_over; | |
258 | } | |
259 | ss->prev_iops = td_iops; | |
260 | ss->prev_bytes = td_bytes; | |
261 | ||
ec55e631 | 262 | if (td->o.group_reporting && !(ss->state & __FIO_SS_DATA)) |
4cd5b75b JA |
263 | continue; |
264 | ||
7be78a8a JA |
265 | /* |
266 | * Don't begin checking criterion until ss->ramp_time is over | |
267 | * for at least one thread in group | |
268 | */ | |
4cd5b75b JA |
269 | if (!group_ramp_time_over) |
270 | continue; | |
271 | ||
7be78a8a JA |
272 | dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, " |
273 | "groupid: %u, rate_msec: %ld, " | |
274 | "iops: %lu, bw: %lu, head: %d, tail: %d\n", | |
275 | i, td->groupid, rate_time, group_iops, | |
276 | group_bw, ss->head, ss->tail); | |
4cd5b75b | 277 | |
f0c50c66 | 278 | if (td->o.ss & __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) { | |
285 | for_each_td(td2, j) { | |
286 | if (td2->groupid == td->groupid) { | |
5b4b6586 | 287 | td2->ss.state |= __FIO_SS_ATTAINED; |
4cd5b75b JA |
288 | fio_mark_td_terminate(td2); |
289 | } | |
290 | } | |
291 | } else { | |
5b4b6586 | 292 | ss->state |= __FIO_SS_ATTAINED; |
4cd5b75b JA |
293 | fio_mark_td_terminate(td); |
294 | } | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
56a90eba | 299 | int td_steadystate_init(struct thread_data *td) |
f0c50c66 JA |
300 | { |
301 | struct steadystate_data *ss = &td->ss; | |
302 | struct thread_options *o = &td->o; | |
56a90eba VF |
303 | struct thread_data *td2; |
304 | int j; | |
f0c50c66 JA |
305 | |
306 | memset(ss, 0, sizeof(*ss)); | |
307 | ||
56a90eba VF |
308 | if (o->ss_dur) { |
309 | steadystate_enabled = true; | |
310 | o->ss_dur /= 1000000L; | |
311 | ||
312 | /* put all steady state info in one place */ | |
313 | ss->dur = o->ss_dur; | |
314 | ss->limit = o->ss_limit.u.f; | |
315 | ss->ramp_time = o->ss_ramp_time; | |
f0c50c66 | 316 | |
56a90eba VF |
317 | ss->state = o->ss; |
318 | if (!td->ss.ramp_time) | |
319 | ss->state |= __FIO_SS_RAMP_OVER; | |
4cd5b75b | 320 | |
56a90eba VF |
321 | ss->sum_x = o->ss_dur * (o->ss_dur - 1) / 2; |
322 | ss->sum_x_sq = (o->ss_dur - 1) * (o->ss_dur) * (2*o->ss_dur - 1) / 6; | |
56a90eba | 323 | } |
5b4b6586 | 324 | |
56a90eba VF |
325 | /* make sure that ss options are consistent within reporting group */ |
326 | for_each_td(td2, j) { | |
327 | if (td2->groupid == td->groupid) { | |
328 | struct steadystate_data *ss2 = &td2->ss; | |
329 | ||
330 | if (ss2->dur != ss->dur || | |
331 | ss2->limit != ss->limit || | |
332 | ss2->ramp_time != ss->ramp_time || | |
56a90eba VF |
333 | ss2->state != ss->state || |
334 | ss2->sum_x != ss->sum_x || | |
335 | ss2->sum_x_sq != ss->sum_x_sq) { | |
336 | td_verror(td, EINVAL, "job rejected: steadystate options must be consistent within reporting groups"); | |
337 | return 1; | |
338 | } | |
339 | } | |
340 | } | |
f0c50c66 | 341 | |
56a90eba | 342 | return 0; |
f0c50c66 | 343 | } |
d685adfb | 344 | |
bb49c8bd | 345 | unsigned long long steadystate_bw_mean(struct thread_stat *ts) |
d685adfb VF |
346 | { |
347 | int i; | |
348 | unsigned long long sum; | |
349 | ||
bb49c8bd VF |
350 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
351 | sum += ts->ss_bw_data[i]; | |
d685adfb | 352 | |
bb49c8bd | 353 | return sum / ts->ss_dur; |
d685adfb VF |
354 | } |
355 | ||
bb49c8bd | 356 | unsigned long long steadystate_iops_mean(struct thread_stat *ts) |
d685adfb VF |
357 | { |
358 | int i; | |
359 | unsigned long long sum; | |
360 | ||
bb49c8bd VF |
361 | for (i = 0, sum = 0; i < ts->ss_dur; i++) |
362 | sum += ts->ss_iops_data[i]; | |
d685adfb | 363 | |
bb49c8bd | 364 | return sum / ts->ss_dur; |
d685adfb | 365 | } |