bytecodeHistogram.cpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1997, 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 "precompiled.hpp"
26#include "interpreter/bytecodeHistogram.hpp"
27#include "memory/resourceArea.hpp"
28#include "runtime/os.hpp"
29#include "utilities/growableArray.hpp"
30
31// ------------------------------------------------------------------------------------------------
32// Non-product code
33#ifndef PRODUCT
34
35// Implementation of BytecodeCounter
36
37int   BytecodeCounter::_counter_value = 0;
38jlong BytecodeCounter::_reset_time    = 0;
39
40
41void BytecodeCounter::reset() {
42  _counter_value = 0;
43  _reset_time    = os::elapsed_counter();
44}
45
46
47double BytecodeCounter::elapsed_time() {
48  return (double)(os::elapsed_counter() - _reset_time) / (double)os::elapsed_frequency();
49}
50
51
52double BytecodeCounter::frequency() {
53  return (double)counter_value() / elapsed_time();
54}
55
56
57void BytecodeCounter::print() {
58  tty->print_cr(
59    "%d bytecodes executed in %.1fs (%.3fMHz)",
60    counter_value(),
61    elapsed_time(),
62    frequency() / 1000000.0
63  );
64}
65
66
67// Helper class for sorting
68
69class HistoEntry: public ResourceObj {
70 private:
71  int             _index;
72  int             _count;
73
74 public:
75  HistoEntry(int index, int count)                         { _index = index; _count = count; }
76  int             index() const                            { return _index; }
77  int             count() const                            { return _count; }
78
79  static int      compare(HistoEntry** x, HistoEntry** y)  { return (*x)->count() - (*y)->count(); }
80};
81
82
83// Helper functions
84
85static GrowableArray<HistoEntry*>* sorted_array(int* array, int length) {
86  GrowableArray<HistoEntry*>* a = new GrowableArray<HistoEntry*>(length);
87  int i = length;
88  while (i-- > 0) a->append(new HistoEntry(i, array[i]));
89  a->sort(HistoEntry::compare);
90  return a;
91}
92
93
94static int total_count(GrowableArray<HistoEntry*>* profile) {
95  int sum = 0;
96  int i = profile->length();
97  while (i-- > 0) sum += profile->at(i)->count();
98  return sum;
99}
100
101
102static const char* name_for(int i) {
103  return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
104}
105
106
107// Implementation of BytecodeHistogram
108
109int BytecodeHistogram::_counters[Bytecodes::number_of_codes];
110
111
112void BytecodeHistogram::reset() {
113  int i = Bytecodes::number_of_codes;
114  while (i-- > 0) _counters[i] = 0;
115}
116
117
118void BytecodeHistogram::print(float cutoff) {
119  ResourceMark rm;
120  GrowableArray<HistoEntry*>* profile = sorted_array(_counters, Bytecodes::number_of_codes);
121  // print profile
122  int tot     = total_count(profile);
123  int abs_sum = 0;
124  tty->cr();   //0123456789012345678901234567890123456789012345678901234567890123456789
125  tty->print_cr("Histogram of %d executed bytecodes:", tot);
126  tty->cr();
127  tty->print_cr("  absolute  relative  code    name");
128  tty->print_cr("----------------------------------------------------------------------");
129  int i = profile->length();
130  while (i-- > 0) {
131    HistoEntry* e = profile->at(i);
132    int       abs = e->count();
133    float     rel = abs * 100.0F / tot;
134    if (cutoff <= rel) {
135      tty->print_cr("%10d  %7.2f%%    %02x    %s", abs, rel, e->index(), name_for(e->index()));
136      abs_sum += abs;
137    }
138  }
139  tty->print_cr("----------------------------------------------------------------------");
140  float rel_sum = abs_sum * 100.0F / tot;
141  tty->print_cr("%10d  %7.2f%%    (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
142  tty->cr();
143}
144
145
146// Implementation of BytecodePairHistogram
147
148int BytecodePairHistogram::_index;
149int BytecodePairHistogram::_counters[BytecodePairHistogram::number_of_pairs];
150
151
152void BytecodePairHistogram::reset() {
153  _index = Bytecodes::_nop << log2_number_of_codes;
154
155  int i = number_of_pairs;
156  while (i-- > 0) _counters[i] = 0;
157}
158
159
160void BytecodePairHistogram::print(float cutoff) {
161  ResourceMark rm;
162  GrowableArray<HistoEntry*>* profile = sorted_array(_counters, number_of_pairs);
163  // print profile
164  int tot     = total_count(profile);
165  int abs_sum = 0;
166  tty->cr();   //0123456789012345678901234567890123456789012345678901234567890123456789
167  tty->print_cr("Histogram of %d executed bytecode pairs:", tot);
168  tty->cr();
169  tty->print_cr("  absolute  relative    codes    1st bytecode        2nd bytecode");
170  tty->print_cr("----------------------------------------------------------------------");
171  int i = profile->length();
172  while (i-- > 0) {
173    HistoEntry* e = profile->at(i);
174    int       abs = e->count();
175    float     rel = abs * 100.0F / tot;
176    if (cutoff <= rel) {
177      int   c1 = e->index() % number_of_codes;
178      int   c2 = e->index() / number_of_codes;
179      tty->print_cr("%10d   %6.3f%%    %02x %02x    %-19s %s", abs, rel, c1, c2, name_for(c1), name_for(c2));
180      abs_sum += abs;
181    }
182  }
183  tty->print_cr("----------------------------------------------------------------------");
184  float rel_sum = abs_sum * 100.0F / tot;
185  tty->print_cr("%10d   %6.3f%%    (cutoff = %.3f%%)", abs_sum, rel_sum, cutoff);
186  tty->cr();
187}
188
189#endif
190