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