1 /*
2 * Copyright (c) 2019, 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 "precompiled.hpp"
26 #include "runtime/atomic.hpp"
27 #include "runtime/atomic.inline.hpp"
28 #include "runtime/os.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31 #include "utilities/tableStatistics.hpp"
32 #if INCLUDE_JFR
33 #include "jfr/jfr.hpp"
34 #endif
35
36 TableRateStatistics::TableRateStatistics() :
37 _added_items(0), _removed_items(0),
38 _time_stamp(0), _seconds_stamp(0),
39 _added_items_stamp(0), _added_items_stamp_prev(0),
40 _removed_items_stamp(0), _removed_items_stamp_prev(0) {}
41
42 TableRateStatistics::~TableRateStatistics() { };
43
44 void TableRateStatistics::add() {
45 #if INCLUDE_JFR
46 if (Jfr::is_recording()) {
47 Atomic::inc_ptr(&_added_items);
48 }
49 #endif
50 }
51
52 void TableRateStatistics::remove() {
53 #if INCLUDE_JFR
54 if (Jfr::is_recording()) {
55 Atomic::inc_ptr(&_removed_items);
56 }
57 #endif
58 }
59
60 void TableRateStatistics::stamp() {
61 jlong now = os::javaTimeNanos();
62
63 _added_items_stamp_prev = _added_items_stamp;
64 _removed_items_stamp_prev = _removed_items_stamp;
65
66 _added_items_stamp = _added_items;
67 _removed_items_stamp = _removed_items;
68
69 if (_time_stamp == 0) {
70 _time_stamp = now - 1000000000;
71 }
72 jlong diff = (now - _time_stamp);
73 _seconds_stamp = (float)diff / 1000000000.0;
74 _time_stamp = now;
75 }
76
77 float TableRateStatistics::get_add_rate() {
78 return (float)((_added_items_stamp - _added_items_stamp_prev) / _seconds_stamp);
79 }
80
81 float TableRateStatistics::get_remove_rate() {
82 return (float)((_removed_items_stamp - _removed_items_stamp_prev) / _seconds_stamp);
83 }
84
85 TableStatistics::TableStatistics() :
86 _literal_bytes(0),
87 _number_of_buckets(0), _number_of_entries(0),
88 _maximum_bucket_size(0), _average_bucket_size(0),
89 _variance_of_bucket_size(0), _stddev_of_bucket_size(0),
90 _bucket_bytes(0), _entry_bytes(0), _total_footprint(0),
91 _bucket_size(0), _entry_size(0),
92 _add_rate(0), _remove_rate(0) {
93 }
94
95 TableStatistics::TableStatistics(TableRateStatistics& rate_stats, NumberSeq summary, size_t literal_bytes, size_t bucket_bytes, size_t node_bytes) :
96 _literal_bytes(literal_bytes),
97 _number_of_buckets(0), _number_of_entries(0),
98 _maximum_bucket_size(0), _average_bucket_size(0),
99 _variance_of_bucket_size(0), _stddev_of_bucket_size(0),
100 _bucket_bytes(0), _entry_bytes(0), _total_footprint(0),
101 _bucket_size(0), _entry_size(0),
102 _add_rate(0), _remove_rate(0) {
103
104 _number_of_buckets = summary.num();
105 _number_of_entries = (size_t)summary.sum();
106
107 _maximum_bucket_size = (size_t)summary.maximum();
108 _average_bucket_size = summary.avg();
109 _variance_of_bucket_size = summary.variance();
110 _stddev_of_bucket_size = summary.sd();
111
112 _bucket_bytes = _number_of_buckets * bucket_bytes;
113 _entry_bytes = _number_of_entries * node_bytes;
114 _total_footprint = _literal_bytes + _bucket_bytes + _entry_bytes;
115
116 _bucket_size = (_number_of_buckets <= 0) ? 0 : (_bucket_bytes / _number_of_buckets);
117 _entry_size = (_number_of_entries <= 0) ? 0 : (_entry_bytes / _number_of_entries);
118
119 #if INCLUDE_JFR
120 if (Jfr::is_recording()) {
121 rate_stats.stamp();
122 _add_rate = rate_stats.get_add_rate();
123 _remove_rate = rate_stats.get_remove_rate();
124 }
125 #endif
126 }
127
128 TableStatistics::~TableStatistics() { }
129
130 void TableStatistics::print(outputStream* st, const char *table_name) {
131 st->print_cr("%s statistics:", table_name);
132 st->print_cr("Number of buckets : %9" PRIuPTR " = %9" PRIuPTR
133 " bytes, each " SIZE_FORMAT,
134 _number_of_buckets, _bucket_bytes, _bucket_size);
135 st->print_cr("Number of entries : %9" PRIuPTR " = %9" PRIuPTR
136 " bytes, each " SIZE_FORMAT,
137 _number_of_entries, _entry_bytes, _entry_size);
138 if (_literal_bytes != 0) {
139 float literal_avg = (_number_of_entries <= 0) ? 0 : (_literal_bytes / _number_of_entries);
140 st->print_cr("Number of literals : %9" PRIuPTR " = %9" PRIuPTR
141 " bytes, avg %7.3f",
142 _number_of_entries, _literal_bytes, literal_avg);
143 }
144 st->print_cr("Total footprint : %9s = %9" PRIuPTR " bytes", "", _total_footprint);
145 st->print_cr("Average bucket size : %9.3f", _average_bucket_size);
146 st->print_cr("Variance of bucket size : %9.3f", _variance_of_bucket_size);
147 st->print_cr("Std. dev. of bucket size: %9.3f", _stddev_of_bucket_size);
148 st->print_cr("Maximum bucket size : %9" PRIuPTR, _maximum_bucket_size);
149 }
150