Mercurial > hg > truffle
annotate src/share/vm/utilities/numberSeq.hpp @ 6495:75f130f2b30f
moved AMD64 specific HotSpot code in com.oracle.graal.hotspot.amd64 project
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 03 Oct 2012 01:18:03 +0200 |
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342 | 1 /* |
5938 | 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_NUMBERSEQ_HPP |
26 #define SHARE_VM_UTILITIES_NUMBERSEQ_HPP | |
27 | |
6197 | 28 #include "memory/allocation.hpp" |
29 | |
342 | 30 /** |
31 ** This file contains a few classes that represent number sequence, | |
32 ** x1, x2, x3, ..., xN, and can calculate their avg, max, and sd. | |
33 ** | |
34 ** Here's a quick description of the classes: | |
35 ** | |
36 ** AbsSeq: abstract superclass | |
37 ** NumberSeq: the sequence is assumed to be very long and the | |
38 ** maximum, avg, sd, davg, and dsd are calculated over all its elements | |
39 ** TruncatedSeq: this class keeps track of the last L elements | |
40 ** of the sequence and calculates avg, max, and sd only over them | |
41 **/ | |
42 | |
43 #define DEFAULT_ALPHA_VALUE 0.7 | |
44 | |
6197 | 45 class AbsSeq: public CHeapObj<mtInternal> { |
342 | 46 private: |
47 void init(double alpha); | |
48 | |
49 protected: | |
50 int _num; // the number of elements in the sequence | |
51 double _sum; // the sum of the elements in the sequence | |
52 double _sum_of_squares; // the sum of squares of the elements in the sequence | |
53 | |
54 double _davg; // decaying average | |
55 double _dvariance; // decaying variance | |
56 double _alpha; // factor for the decaying average / variance | |
57 | |
58 // This is what we divide with to get the average. In a standard | |
59 // number sequence, this should just be the number of elements in it. | |
60 virtual double total() const { return (double) _num; }; | |
61 | |
62 public: | |
63 AbsSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
64 | |
65 virtual void add(double val); // adds a new element to the sequence | |
66 void add(unsigned val) { add((double) val); } | |
67 virtual double maximum() const = 0; // maximum element in the sequence | |
68 virtual double last() const = 0; // last element added in the sequence | |
69 | |
70 // the number of elements in the sequence | |
71 int num() const { return _num; } | |
72 // the sum of the elements in the sequence | |
73 double sum() const { return _sum; } | |
74 | |
75 double avg() const; // the average of the sequence | |
76 double variance() const; // the variance of the sequence | |
77 double sd() const; // the standard deviation of the sequence | |
78 | |
79 double davg() const; // decaying average | |
80 double dvariance() const; // decaying variance | |
81 double dsd() const; // decaying "standard deviation" | |
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82 |
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83 // Debugging/Printing |
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84 virtual void dump(); |
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85 virtual void dump_on(outputStream* s); |
342 | 86 }; |
87 | |
88 class NumberSeq: public AbsSeq { | |
89 private: | |
90 bool check_nums(NumberSeq* total, int n, NumberSeq** parts); | |
91 | |
92 protected: | |
93 double _last; | |
94 double _maximum; // keep track of maximum value | |
95 | |
96 public: | |
97 NumberSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
98 | |
99 virtual void add(double val); | |
100 virtual double maximum() const { return _maximum; } | |
101 virtual double last() const { return _last; } | |
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102 |
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103 // Debugging/Printing |
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104 virtual void dump_on(outputStream* s); |
342 | 105 }; |
106 | |
107 class TruncatedSeq: public AbsSeq { | |
108 private: | |
109 enum PrivateConstants { | |
110 DefaultSeqLength = 10 | |
111 }; | |
112 void init(); | |
113 protected: | |
114 double *_sequence; // buffers the last L elements in the sequence | |
115 int _length; // this is L | |
116 int _next; // oldest slot in the array, i.e. next to be overwritten | |
117 | |
118 public: | |
119 // accepts a value for L | |
120 TruncatedSeq(int length = DefaultSeqLength, | |
121 double alpha = DEFAULT_ALPHA_VALUE); | |
5938 | 122 ~TruncatedSeq(); |
342 | 123 virtual void add(double val); |
124 virtual double maximum() const; | |
125 virtual double last() const; // the last value added to the sequence | |
126 | |
127 double oldest() const; // the oldest valid value in the sequence | |
128 double predict_next() const; // prediction based on linear regression | |
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129 |
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130 // Debugging/Printing |
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131 virtual void dump_on(outputStream* s); |
342 | 132 }; |
1972 | 133 |
134 #endif // SHARE_VM_UTILITIES_NUMBERSEQ_HPP |