Mercurial > hg > truffle
annotate src/share/vm/utilities/numberSeq.hpp @ 1086:89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
Summary: Added instrumentation and (temporary) assert in non-product mode; clipped the value when found out-of-bounds in product mode. Fix of original issue will follow collection of data from this instrumentation.
Reviewed-by: jcoomes, tonyp
| author | ysr |
|---|---|
| date | Fri, 13 Nov 2009 11:55:26 -0800 |
| parents | 37f87013dfd8 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2 * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 /** | |
| 26 ** This file contains a few classes that represent number sequence, | |
| 27 ** x1, x2, x3, ..., xN, and can calculate their avg, max, and sd. | |
| 28 ** | |
| 29 ** Here's a quick description of the classes: | |
| 30 ** | |
| 31 ** AbsSeq: abstract superclass | |
| 32 ** NumberSeq: the sequence is assumed to be very long and the | |
| 33 ** maximum, avg, sd, davg, and dsd are calculated over all its elements | |
| 34 ** TruncatedSeq: this class keeps track of the last L elements | |
| 35 ** of the sequence and calculates avg, max, and sd only over them | |
| 36 **/ | |
| 37 | |
| 38 #define DEFAULT_ALPHA_VALUE 0.7 | |
| 39 | |
| 40 class AbsSeq { | |
| 41 private: | |
| 42 void init(double alpha); | |
| 43 | |
| 44 protected: | |
| 45 int _num; // the number of elements in the sequence | |
| 46 double _sum; // the sum of the elements in the sequence | |
| 47 double _sum_of_squares; // the sum of squares of the elements in the sequence | |
| 48 | |
| 49 double _davg; // decaying average | |
| 50 double _dvariance; // decaying variance | |
| 51 double _alpha; // factor for the decaying average / variance | |
| 52 | |
| 53 // This is what we divide with to get the average. In a standard | |
| 54 // number sequence, this should just be the number of elements in it. | |
| 55 virtual double total() const { return (double) _num; }; | |
| 56 | |
| 57 public: | |
| 58 AbsSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
| 59 | |
| 60 virtual void add(double val); // adds a new element to the sequence | |
| 61 void add(unsigned val) { add((double) val); } | |
| 62 virtual double maximum() const = 0; // maximum element in the sequence | |
| 63 virtual double last() const = 0; // last element added in the sequence | |
| 64 | |
| 65 // the number of elements in the sequence | |
| 66 int num() const { return _num; } | |
| 67 // the sum of the elements in the sequence | |
| 68 double sum() const { return _sum; } | |
| 69 | |
| 70 double avg() const; // the average of the sequence | |
| 71 double variance() const; // the variance of the sequence | |
| 72 double sd() const; // the standard deviation of the sequence | |
| 73 | |
| 74 double davg() const; // decaying average | |
| 75 double dvariance() const; // decaying variance | |
| 76 double dsd() const; // decaying "standard deviation" | |
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77 |
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78 // Debugging/Printing |
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79 virtual void dump(); |
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80 virtual void dump_on(outputStream* s); |
| 342 | 81 }; |
| 82 | |
| 83 class NumberSeq: public AbsSeq { | |
| 84 private: | |
| 85 bool check_nums(NumberSeq* total, int n, NumberSeq** parts); | |
| 86 | |
| 87 protected: | |
| 88 double _last; | |
| 89 double _maximum; // keep track of maximum value | |
| 90 | |
| 91 public: | |
| 92 NumberSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
| 93 NumberSeq(NumberSeq* total, int n_parts, NumberSeq** parts); | |
| 94 | |
| 95 virtual void add(double val); | |
| 96 virtual double maximum() const { return _maximum; } | |
| 97 virtual double last() const { return _last; } | |
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98 |
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99 // Debugging/Printing |
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100 virtual void dump_on(outputStream* s); |
| 342 | 101 }; |
| 102 | |
| 103 class TruncatedSeq: public AbsSeq { | |
| 104 private: | |
| 105 enum PrivateConstants { | |
| 106 DefaultSeqLength = 10 | |
| 107 }; | |
| 108 void init(); | |
| 109 protected: | |
| 110 double *_sequence; // buffers the last L elements in the sequence | |
| 111 int _length; // this is L | |
| 112 int _next; // oldest slot in the array, i.e. next to be overwritten | |
| 113 | |
| 114 public: | |
| 115 // accepts a value for L | |
| 116 TruncatedSeq(int length = DefaultSeqLength, | |
| 117 double alpha = DEFAULT_ALPHA_VALUE); | |
| 118 virtual void add(double val); | |
| 119 virtual double maximum() const; | |
| 120 virtual double last() const; // the last value added to the sequence | |
| 121 | |
| 122 double oldest() const; // the oldest valid value in the sequence | |
| 123 double predict_next() const; // prediction based on linear regression | |
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124 |
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125 // Debugging/Printing |
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126 virtual void dump_on(outputStream* s); |
| 342 | 127 }; |