1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_survRateGroup.cpp.incl"
27
28 SurvRateGroup::SurvRateGroup(G1CollectorPolicy* g1p,
29 const char* name,
30 size_t summary_surv_rates_len) :
31 _g1p(g1p), _name(name),
32 _summary_surv_rates_len(summary_surv_rates_len),
33 _summary_surv_rates_max_len(0),
34 _summary_surv_rates(NULL),
35 _surv_rate(NULL),
36 _accum_surv_rate_pred(NULL),
37 _surv_rate_pred(NULL)
38 {
39 reset();
40 if (summary_surv_rates_len > 0) {
41 size_t length = summary_surv_rates_len;
42 _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length);
43 if (_summary_surv_rates == NULL) {
44 vm_exit_out_of_memory(sizeof(NumberSeq*) * length,
45 "Not enough space for surv rate summary");
46 }
47 for (size_t i = 0; i < length; ++i)
48 _summary_surv_rates[i] = new NumberSeq();
49 }
50
51 start_adding_regions();
52 }
53
54
55 void SurvRateGroup::reset()
56 {
57 _all_regions_allocated = 0;
58 _setup_seq_num = 0;
59 _stats_arrays_length = 0;
60 _accum_surv_rate = 0.0;
61 _last_pred = 0.0;
62 // the following will set up the arrays with length 1
63 _region_num = 1;
64 stop_adding_regions();
65 guarantee( _stats_arrays_length == 1, "invariant" );
66 guarantee( _surv_rate_pred[0] != NULL, "invariant" );
67 _surv_rate_pred[0]->add(0.4);
68 all_surviving_words_recorded(false);
69 _region_num = 0;
70 }
71
72
73 void
74 SurvRateGroup::start_adding_regions() {
75 _setup_seq_num = _stats_arrays_length;
76 _region_num = 0;
77 _accum_surv_rate = 0.0;
78
79 #if 0
80 gclog_or_tty->print_cr("[%s] start adding regions, seq num %d, length %d",
81 _name, _setup_seq_num, _region_num);
82 #endif // 0
83 }
84
85 void
86 SurvRateGroup::stop_adding_regions() {
87
88 #if 0
89 gclog_or_tty->print_cr("[%s] stop adding regions, length %d", _name, _region_num);
90 #endif // 0
91
92 if (_region_num > _stats_arrays_length) {
93 double* old_surv_rate = _surv_rate;
94 double* old_accum_surv_rate_pred = _accum_surv_rate_pred;
95 TruncatedSeq** old_surv_rate_pred = _surv_rate_pred;
96
97 _surv_rate = NEW_C_HEAP_ARRAY(double, _region_num);
98 if (_surv_rate == NULL) {
99 vm_exit_out_of_memory(sizeof(double) * _region_num,
100 "Not enough space for surv rate array.");
101 }
102 _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num);
103 if (_accum_surv_rate_pred == NULL) {
104 vm_exit_out_of_memory(sizeof(double) * _region_num,
105 "Not enough space for accum surv rate pred array.");
106 }
107 _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num);
108 if (_surv_rate == NULL) {
109 vm_exit_out_of_memory(sizeof(TruncatedSeq*) * _region_num,
110 "Not enough space for surv rate pred array.");
111 }
112
113 for (size_t i = 0; i < _stats_arrays_length; ++i)
114 _surv_rate_pred[i] = old_surv_rate_pred[i];
115
116 #if 0
117 gclog_or_tty->print_cr("[%s] stop adding regions, new seqs %d to %d",
118 _name, _array_length, _region_num - 1);
119 #endif // 0
120
121 for (size_t i = _stats_arrays_length; i < _region_num; ++i) {
122 _surv_rate_pred[i] = new TruncatedSeq(10);
123 // _surv_rate_pred[i]->add(last_pred);
124 }
125
126 _stats_arrays_length = _region_num;
127
128 if (old_surv_rate != NULL)
129 FREE_C_HEAP_ARRAY(double, old_surv_rate);
130 if (old_accum_surv_rate_pred != NULL)
131 FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred);
132 if (old_surv_rate_pred != NULL)
133 FREE_C_HEAP_ARRAY(NumberSeq*, old_surv_rate_pred);
134 }
135
136 for (size_t i = 0; i < _stats_arrays_length; ++i)
137 _surv_rate[i] = 0.0;
138 }
139
140 double
141 SurvRateGroup::accum_surv_rate(size_t adjustment) {
142 // we might relax this one in the future...
143 guarantee( adjustment == 0 || adjustment == 1, "pre-condition" );
144
145 double ret = _accum_surv_rate;
146 if (adjustment > 0) {
147 TruncatedSeq* seq = get_seq(_region_num+1);
148 double surv_rate = _g1p->get_new_prediction(seq);
149 ret += surv_rate;
150 }
151
152 return ret;
153 }
154
155 int
156 SurvRateGroup::next_age_index() {
157 TruncatedSeq* seq = get_seq(_region_num);
158 double surv_rate = _g1p->get_new_prediction(seq);
159 _accum_surv_rate += surv_rate;
160
161 ++_region_num;
162 return (int) ++_all_regions_allocated;
163 }
164
165 void
166 SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
167 guarantee( 0 <= age_in_group && (size_t) age_in_group < _region_num,
168 "pre-condition" );
169 guarantee( _surv_rate[age_in_group] <= 0.00001,
170 "should only update each slot once" );
171
172 double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
173 _surv_rate[age_in_group] = surv_rate;
174 _surv_rate_pred[age_in_group]->add(surv_rate);
175 if ((size_t)age_in_group < _summary_surv_rates_len) {
176 _summary_surv_rates[age_in_group]->add(surv_rate);
177 if ((size_t)(age_in_group+1) > _summary_surv_rates_max_len)
178 _summary_surv_rates_max_len = age_in_group+1;
179 }
180 }
181
182 void
183 SurvRateGroup::all_surviving_words_recorded(bool propagate) {
184 if (propagate && _region_num > 0) { // conservative
185 double surv_rate = _surv_rate_pred[_region_num-1]->last();
186
187 #if 0
188 gclog_or_tty->print_cr("propagating %1.2lf from %d to %d",
189 surv_rate, _curr_length, _array_length - 1);
190 #endif // 0
191
192 for (size_t i = _region_num; i < _stats_arrays_length; ++i) {
193 guarantee( _surv_rate[i] <= 0.00001,
194 "the slot should not have been updated" );
195 _surv_rate_pred[i]->add(surv_rate);
196 }
197 }
198
199 double accum = 0.0;
200 double pred = 0.0;
201 for (size_t i = 0; i < _stats_arrays_length; ++i) {
202 pred = _g1p->get_new_prediction(_surv_rate_pred[i]);
203 if (pred > 1.0) pred = 1.0;
204 accum += pred;
205 _accum_surv_rate_pred[i] = accum;
206 // gclog_or_tty->print_cr("age %3d, accum %10.2lf", i, accum);
207 }
208 _last_pred = pred;
209 }
210
211 #ifndef PRODUCT
212 void
213 SurvRateGroup::print() {
214 gclog_or_tty->print_cr("Surv Rate Group: %s (%d entries)",
215 _name, _region_num);
216 for (size_t i = 0; i < _region_num; ++i) {
217 gclog_or_tty->print_cr(" age %4d surv rate %6.2lf %% pred %6.2lf %%",
218 i, _surv_rate[i] * 100.0,
219 _g1p->get_new_prediction(_surv_rate_pred[i]) * 100.0);
220 }
221 }
222
223 void
224 SurvRateGroup::print_surv_rate_summary() {
225 size_t length = _summary_surv_rates_max_len;
226 if (length == 0)
227 return;
228
229 gclog_or_tty->print_cr("");
230 gclog_or_tty->print_cr("%s Rate Summary (for up to age %d)", _name, length-1);
231 gclog_or_tty->print_cr(" age range survival rate (avg) samples (avg)");
232 gclog_or_tty->print_cr(" ---------------------------------------------------------");
233
234 size_t index = 0;
235 size_t limit = MIN2((int) length, 10);
236 while (index < limit) {
237 gclog_or_tty->print_cr(" %4d %6.2lf%% %6.2lf",
238 index, _summary_surv_rates[index]->avg() * 100.0,
239 (double) _summary_surv_rates[index]->num());
240 ++index;
241 }
242
243 gclog_or_tty->print_cr(" ---------------------------------------------------------");
244
245 int num = 0;
246 double sum = 0.0;
247 int samples = 0;
248 while (index < length) {
249 ++num;
250 sum += _summary_surv_rates[index]->avg() * 100.0;
251 samples += _summary_surv_rates[index]->num();
252 ++index;
253
254 if (index == length || num % 10 == 0) {
255 gclog_or_tty->print_cr(" %4d .. %4d %6.2lf%% %6.2lf",
256 (index-1) / 10 * 10, index-1, sum / (double) num,
257 (double) samples / (double) num);
258 sum = 0.0;
259 num = 0;
260 samples = 0;
261 }
262 }
263
264 gclog_or_tty->print_cr(" ---------------------------------------------------------");
265 }
266 #endif // PRODUCT