Mercurial > hg > truffle
annotate src/share/vm/utilities/numberSeq.hpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
| author | coleenp |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | f95d63e2154a |
| children | 2c0751569716 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1086
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1086
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1086
diff
changeset
|
21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_UTILITIES_NUMBERSEQ_HPP |
| 26 #define SHARE_VM_UTILITIES_NUMBERSEQ_HPP | |
| 27 | |
| 342 | 28 /** |
| 29 ** This file contains a few classes that represent number sequence, | |
| 30 ** x1, x2, x3, ..., xN, and can calculate their avg, max, and sd. | |
| 31 ** | |
| 32 ** Here's a quick description of the classes: | |
| 33 ** | |
| 34 ** AbsSeq: abstract superclass | |
| 35 ** NumberSeq: the sequence is assumed to be very long and the | |
| 36 ** maximum, avg, sd, davg, and dsd are calculated over all its elements | |
| 37 ** TruncatedSeq: this class keeps track of the last L elements | |
| 38 ** of the sequence and calculates avg, max, and sd only over them | |
| 39 **/ | |
| 40 | |
| 41 #define DEFAULT_ALPHA_VALUE 0.7 | |
| 42 | |
| 43 class AbsSeq { | |
| 44 private: | |
| 45 void init(double alpha); | |
| 46 | |
| 47 protected: | |
| 48 int _num; // the number of elements in the sequence | |
| 49 double _sum; // the sum of the elements in the sequence | |
| 50 double _sum_of_squares; // the sum of squares of the elements in the sequence | |
| 51 | |
| 52 double _davg; // decaying average | |
| 53 double _dvariance; // decaying variance | |
| 54 double _alpha; // factor for the decaying average / variance | |
| 55 | |
| 56 // This is what we divide with to get the average. In a standard | |
| 57 // number sequence, this should just be the number of elements in it. | |
| 58 virtual double total() const { return (double) _num; }; | |
| 59 | |
| 60 public: | |
| 61 AbsSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
| 62 | |
| 63 virtual void add(double val); // adds a new element to the sequence | |
| 64 void add(unsigned val) { add((double) val); } | |
| 65 virtual double maximum() const = 0; // maximum element in the sequence | |
| 66 virtual double last() const = 0; // last element added in the sequence | |
| 67 | |
| 68 // the number of elements in the sequence | |
| 69 int num() const { return _num; } | |
| 70 // the sum of the elements in the sequence | |
| 71 double sum() const { return _sum; } | |
| 72 | |
| 73 double avg() const; // the average of the sequence | |
| 74 double variance() const; // the variance of the sequence | |
| 75 double sd() const; // the standard deviation of the sequence | |
| 76 | |
| 77 double davg() const; // decaying average | |
| 78 double dvariance() const; // decaying variance | |
| 79 double dsd() const; // decaying "standard deviation" | |
|
1086
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
80 |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
81 // Debugging/Printing |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
82 virtual void dump(); |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
83 virtual void dump_on(outputStream* s); |
| 342 | 84 }; |
| 85 | |
| 86 class NumberSeq: public AbsSeq { | |
| 87 private: | |
| 88 bool check_nums(NumberSeq* total, int n, NumberSeq** parts); | |
| 89 | |
| 90 protected: | |
| 91 double _last; | |
| 92 double _maximum; // keep track of maximum value | |
| 93 | |
| 94 public: | |
| 95 NumberSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
| 96 NumberSeq(NumberSeq* total, int n_parts, NumberSeq** parts); | |
| 97 | |
| 98 virtual void add(double val); | |
| 99 virtual double maximum() const { return _maximum; } | |
| 100 virtual double last() const { return _last; } | |
|
1086
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
101 |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
102 // Debugging/Printing |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
103 virtual void dump_on(outputStream* s); |
| 342 | 104 }; |
| 105 | |
| 106 class TruncatedSeq: public AbsSeq { | |
| 107 private: | |
| 108 enum PrivateConstants { | |
| 109 DefaultSeqLength = 10 | |
| 110 }; | |
| 111 void init(); | |
| 112 protected: | |
| 113 double *_sequence; // buffers the last L elements in the sequence | |
| 114 int _length; // this is L | |
| 115 int _next; // oldest slot in the array, i.e. next to be overwritten | |
| 116 | |
| 117 public: | |
| 118 // accepts a value for L | |
| 119 TruncatedSeq(int length = DefaultSeqLength, | |
| 120 double alpha = DEFAULT_ALPHA_VALUE); | |
| 121 virtual void add(double val); | |
| 122 virtual double maximum() const; | |
| 123 virtual double last() const; // the last value added to the sequence | |
| 124 | |
| 125 double oldest() const; // the oldest valid value in the sequence | |
| 126 double predict_next() const; // prediction based on linear regression | |
|
1086
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
127 |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
128 // Debugging/Printing |
|
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
ysr
parents:
342
diff
changeset
|
129 virtual void dump_on(outputStream* s); |
| 342 | 130 }; |
| 1972 | 131 |
| 132 #endif // SHARE_VM_UTILITIES_NUMBERSEQ_HPP |