Thu, 31 May 2012 21:10:33 +0200
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
Summary: Simplify code, remove unused code, remove ExitAfterGCNum
Reviewed-by: huntch, johnc
1 /*
2 * Copyright (c) 2001, 2012, 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 */
25 #ifndef SHARE_VM_UTILITIES_NUMBERSEQ_HPP
26 #define SHARE_VM_UTILITIES_NUMBERSEQ_HPP
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 **/
41 #define DEFAULT_ALPHA_VALUE 0.7
43 class AbsSeq {
44 private:
45 void init(double alpha);
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
52 double _davg; // decaying average
53 double _dvariance; // decaying variance
54 double _alpha; // factor for the decaying average / variance
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; };
60 public:
61 AbsSeq(double alpha = DEFAULT_ALPHA_VALUE);
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
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; }
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
77 double davg() const; // decaying average
78 double dvariance() const; // decaying variance
79 double dsd() const; // decaying "standard deviation"
81 // Debugging/Printing
82 virtual void dump();
83 virtual void dump_on(outputStream* s);
84 };
86 class NumberSeq: public AbsSeq {
87 private:
88 bool check_nums(NumberSeq* total, int n, NumberSeq** parts);
90 protected:
91 double _last;
92 double _maximum; // keep track of maximum value
94 public:
95 NumberSeq(double alpha = DEFAULT_ALPHA_VALUE);
97 virtual void add(double val);
98 virtual double maximum() const { return _maximum; }
99 virtual double last() const { return _last; }
101 // Debugging/Printing
102 virtual void dump_on(outputStream* s);
103 };
105 class TruncatedSeq: public AbsSeq {
106 private:
107 enum PrivateConstants {
108 DefaultSeqLength = 10
109 };
110 void init();
111 protected:
112 double *_sequence; // buffers the last L elements in the sequence
113 int _length; // this is L
114 int _next; // oldest slot in the array, i.e. next to be overwritten
116 public:
117 // accepts a value for L
118 TruncatedSeq(int length = DefaultSeqLength,
119 double alpha = DEFAULT_ALPHA_VALUE);
120 ~TruncatedSeq();
121 virtual void add(double val);
122 virtual double maximum() const;
123 virtual double last() const; // the last value added to the sequence
125 double oldest() const; // the oldest valid value in the sequence
126 double predict_next() const; // prediction based on linear regression
128 // Debugging/Printing
129 virtual void dump_on(outputStream* s);
130 };
132 #endif // SHARE_VM_UTILITIES_NUMBERSEQ_HPP