13 #define MAX_NET_LAG 2.0 /* Max net lag in seconds. TODO: estimate dynamically. */
14 #define RESERVED_BYOYOMI_PERCENT 15 /* Reserve 15% of byoyomi time as safety margin if risk of losing on time */
16 /* For safety, use at most 3 times the desired time on a single move
17 * in main time, and 1.1 times in byoyomi. */
18 #define MAX_MAIN_TIME_EXTENSION 3.0
19 #define MAX_BYOYOMI_TIME_EXTENSION 1.1
22 time_parse(struct time_info
*ti
, char *s
)
25 case '_': ti
->period
= TT_TOTAL
; s
++; break;
26 default: ti
->period
= TT_MOVE
; break;
31 ti
->len
.games
= atoi(++s
);
36 ti
->dim
= TD_WALLTIME
;
37 ti
->len
.t
.main_time
= atof(s
);
38 ti
->len
.t
.byoyomi_time
= 0.0;
39 ti
->len
.t
.byoyomi_periods
= 0;
40 ti
->len
.t
.byoyomi_stones
= 0;
41 ti
->len
.t
.timer_start
= 0;
47 /* Update time settings according to gtp time_settings or kgs-time_settings command. */
49 time_settings(struct time_info
*ti
, int main_time
, int byoyomi_time
, int byoyomi_stones
, int byoyomi_periods
)
51 if (byoyomi_time
> 0 && byoyomi_stones
== 0) {
52 ti
->period
= TT_NULL
; // no time limit, rely on engine default
54 ti
->period
= TT_TOTAL
;
55 ti
->dim
= TD_WALLTIME
;
56 ti
->len
.t
.main_time
= (double) main_time
;
57 ti
->len
.t
.byoyomi_time
= (double) byoyomi_time
;
58 ti
->len
.t
.byoyomi_periods
= byoyomi_periods
> 1 ? byoyomi_periods
: 1;
59 ti
->len
.t
.byoyomi_stones
= byoyomi_stones
> 1 ? byoyomi_stones
: 1;
60 ti
->len
.t
.canadian
= byoyomi_stones
> 0;
61 ti
->len
.t
.timer_start
= 0;
65 /* Update time information according to gtp time_left command.
66 * kgs doesn't give time_left for the first move, so make sure
67 * that just time_settings + time_stop_conditions still work. */
69 time_left(struct time_info
*ti
, int time_left
, int stones_left
)
71 assert(ti
->period
!= TT_NULL
);
72 ti
->dim
= TD_WALLTIME
;
74 if (stones_left
== 0) {
76 ti
->period
= TT_TOTAL
;
77 ti
->len
.t
.main_time
= time_left
;
78 /* byoyomi_time kept fully charged. */
82 ti
->len
.t
.main_time
= 0;
83 ti
->len
.t
.byoyomi_time
= time_left
;
84 if (ti
->len
.t
.canadian
) {
85 ti
->len
.t
.byoyomi_stones
= stones_left
;
87 // field misused by kgs
88 ti
->len
.t
.byoyomi_periods
= stones_left
;
93 /* Returns true if we are in byoyomi (or should play as if in byo yomi
94 * because remaining time per move in main time is less than byoyomi time
97 time_in_byoyomi(struct time_info
*ti
) {
98 assert(ti
->dim
== TD_WALLTIME
);
99 if (!ti
->len
.t
.byoyomi_time
)
100 return false; // there is no byoyomi!
101 assert(ti
->len
.t
.byoyomi_stones
> 0);
102 if (!ti
->len
.t
.main_time
)
103 return true; // we _are_ in byoyomi
104 if (ti
->len
.t
.main_time
<= ti
->len
.t
.byoyomi_time
/ ti
->len
.t
.byoyomi_stones
+ 0.001)
105 return true; // our basic time left is less than byoyomi time per move
109 /* Start our timer. kgs does this (correctly) on "play" not "genmove"
110 * unless we are making the first move of the game. */
112 time_start_timer(struct time_info
*ti
)
114 if (ti
->period
!= TT_NULL
&& ti
->dim
== TD_WALLTIME
)
115 ti
->len
.t
.timer_start
= time_now();
118 /* Returns the current time. */
123 clock_gettime(CLOCK_REALTIME
, &now
);
124 return now
.tv_sec
+ now
.tv_nsec
/1000000000.0;
127 /* Sleep for a given interval (in seconds). Return immediately if interval < 0. */
129 time_sleep(double interval
)
133 ts
.tv_nsec
= (int)(modf(interval
, &sec
)*1000000000.0);
134 ts
.tv_sec
= (int)sec
;
135 nanosleep(&ts
, NULL
); /* ignore error if interval was < 0 */
139 /* Pre-process time_info for search control and sets the desired stopping conditions. */
141 time_stop_conditions(struct time_info
*ti
, struct board
*b
, int fuseki_end
, int yose_start
, struct time_stop
*stop
)
143 /* We must have _some_ limits by now, be it random default values! */
144 assert(ti
->period
!= TT_NULL
);
146 /* Minimum net lag (seconds) to be reserved in the time for move. */
147 double net_lag
= MAX_NET_LAG
;
148 /* Absolute maximum time possible to spend on the move. */
150 /* Ideal/reasonable time to spend on the move. */
151 double recommended_time
;
153 /* Special-case limit by number of simulations. */
154 if (ti
->dim
== TD_GAMES
) {
155 if (ti
->period
== TT_TOTAL
) {
156 ti
->period
= TT_MOVE
;
157 ti
->len
.games
/= board_estimated_moves_left(b
);
160 stop
->desired
.playouts
= ti
->len
.games
;
161 /* We force worst == desired, so note that we will NOT loop
162 * until best == winner. */
163 stop
->worst
.playouts
= ti
->len
.games
;
167 assert(ti
->dim
== TD_WALLTIME
);
170 /*** Transform @ti to TT_MOVE and set up recommended/max time and
171 * net lag information. */
173 /* Make sure timer_start is set up, adjust net_lag. */
174 double now
= time_now();
175 if (!ti
->len
.t
.timer_start
) {
176 ti
->len
.t
.timer_start
= now
; // we're playing the first game move
178 net_lag
+= now
- ti
->len
.t
.timer_start
;
179 // TODO: keep statistics to get good estimate of lag not just current move
182 /* Set up initial recommendations. */
183 if (ti
->len
.t
.main_time
) {
184 max_time
= recommended_time
= ti
->len
.t
.main_time
;
186 max_time
= ti
->len
.t
.byoyomi_time
;
187 assert(ti
->len
.t
.byoyomi_stones
> 0);
188 recommended_time
= ti
->len
.t
.byoyomi_time
/ ti
->len
.t
.byoyomi_stones
;
191 if (ti
->period
== TT_TOTAL
) {
192 int moves_left
= board_estimated_moves_left(b
);
193 if (ti
->len
.t
.byoyomi_time
> 0) {
194 assert(ti
->len
.t
.byoyomi_stones
> 0);
195 /* Time for one move in byoyomi. */
196 double move_time
= ti
->len
.t
.byoyomi_time
/ ti
->len
.t
.byoyomi_stones
;
198 /* For Japanese byoyomi with N>1 periods, we use N-1 periods as main time,
199 * keeping the last one as insurance against unexpected net lag. */
200 if (ti
->len
.t
.byoyomi_periods
> 2) {
201 max_time
+= (ti
->len
.t
.byoyomi_periods
- 2) * move_time
;
202 // Will add 1 more byoyomi_time just below
204 max_time
+= move_time
;
205 recommended_time
= max_time
;
207 /* Maximize the number of moves played uniformly in main time, while
208 * not playing faster in main time than in byoyomi. At this point,
209 * the main time remaining is ti->len.t.max_time and already includes
210 * the first (canadian) or N-1 byoyomi periods.
211 * main_speed = max_time / main_moves >= move_time
212 * => main_moves <= max_time / move_time */
213 double actual_byoyomi
= move_time
- net_lag
;
214 if (actual_byoyomi
> 0) {
215 int main_moves
= (int)(max_time
/ actual_byoyomi
);
216 if (moves_left
> main_moves
)
217 moves_left
= main_moves
; // will do the rest in byoyomi
218 if (moves_left
<= 0) // possible if too much lag
222 ti
->period
= TT_MOVE
;
223 recommended_time
/= moves_left
;
225 // To simplify the engine code, do not leave negative times:
226 if (recommended_time
< 0)
227 recommended_time
= 0;
230 assert(recommended_time
<= max_time
+ 0.001);
232 /* Use a larger safety margin if we risk losing on time on this move: */
233 double safe_margin
= RESERVED_BYOYOMI_PERCENT
* ti
->len
.t
.byoyomi_time
/100;
234 if (safe_margin
> 0) {
235 assert(ti
->len
.t
.byoyomi_stones
> 0);
236 safe_margin
/= ti
->len
.t
.byoyomi_stones
;
238 if (safe_margin
> MAX_NET_LAG
&& recommended_time
>= max_time
- net_lag
) {
239 net_lag
= safe_margin
;
243 fprintf(stderr
, "recommended_time %0.2f, max_time %0.2f, byoyomi %0.2f/%d, lag %0.2f\n",
244 recommended_time
, max_time
,
245 ti
->len
.t
.byoyomi_time
, ti
->len
.t
.byoyomi_stones
,
249 /*** Setup desired/worst time limits based on recommended/max time. */
251 assert(ti
->period
== TT_MOVE
);
253 double desired_time
= recommended_time
;
255 if (time_in_byoyomi(ti
)) {
256 // make recommended == average(desired, worst)
257 worst_time
= desired_time
* MAX_BYOYOMI_TIME_EXTENSION
;
258 desired_time
*= (2 - MAX_BYOYOMI_TIME_EXTENSION
);
261 int bsize
= (board_size(b
)-2)*(board_size(b
)-2);
262 fuseki_end
= fuseki_end
* bsize
/ 100; // move nb at fuseki end
263 yose_start
= yose_start
* bsize
/ 100; // move nb at yose start
264 assert(fuseki_end
< yose_start
);
266 /* Before yose, spend some extra. */
267 if (b
->moves
< yose_start
) {
268 int moves_to_yose
= (yose_start
- b
->moves
) / 2;
269 // ^- /2 because we only consider the moves we have to play ourselves
270 int left_at_yose_start
= board_estimated_moves_left(b
) - moves_to_yose
;
271 if (left_at_yose_start
< MIN_MOVES_LEFT
)
272 left_at_yose_start
= MIN_MOVES_LEFT
;
273 double longest_time
= max_time
/ left_at_yose_start
;
274 if (longest_time
< desired_time
) {
275 // Should rarely happen, but keep desired_time anyway
276 } else if (b
->moves
< fuseki_end
) {
277 assert(fuseki_end
> 0);
278 desired_time
+= ((longest_time
- desired_time
) * b
->moves
) / fuseki_end
;
279 } else { assert(b
->moves
< yose_start
);
280 desired_time
= longest_time
;
283 worst_time
= desired_time
* MAX_MAIN_TIME_EXTENSION
;
285 if (worst_time
> max_time
)
286 worst_time
= max_time
;
287 if (desired_time
> worst_time
)
288 desired_time
= worst_time
;
290 stop
->desired
.time
= ti
->len
.t
.timer_start
+ desired_time
- net_lag
;
291 stop
->worst
.time
= ti
->len
.t
.timer_start
+ worst_time
- net_lag
;
292 // Both stop points may be in the past if too much lag.
295 fprintf(stderr
, "desired time %.02f, worst %.02f\n", desired_time
, worst_time
);