Mercurial > hg > graal-compiler
view src/share/vm/utilities/numberSeq.hpp @ 3877:a3592789b47c
Added tag jdk8-b02 for changeset 31e253c1da42
author | schien |
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date | Thu, 25 Aug 2011 17:17:59 -0700 |
parents | f95d63e2154a |
children | 2c0751569716 |
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/* * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_UTILITIES_NUMBERSEQ_HPP #define SHARE_VM_UTILITIES_NUMBERSEQ_HPP /** ** This file contains a few classes that represent number sequence, ** x1, x2, x3, ..., xN, and can calculate their avg, max, and sd. ** ** Here's a quick description of the classes: ** ** AbsSeq: abstract superclass ** NumberSeq: the sequence is assumed to be very long and the ** maximum, avg, sd, davg, and dsd are calculated over all its elements ** TruncatedSeq: this class keeps track of the last L elements ** of the sequence and calculates avg, max, and sd only over them **/ #define DEFAULT_ALPHA_VALUE 0.7 class AbsSeq { private: void init(double alpha); protected: int _num; // the number of elements in the sequence double _sum; // the sum of the elements in the sequence double _sum_of_squares; // the sum of squares of the elements in the sequence double _davg; // decaying average double _dvariance; // decaying variance double _alpha; // factor for the decaying average / variance // This is what we divide with to get the average. In a standard // number sequence, this should just be the number of elements in it. virtual double total() const { return (double) _num; }; public: AbsSeq(double alpha = DEFAULT_ALPHA_VALUE); virtual void add(double val); // adds a new element to the sequence void add(unsigned val) { add((double) val); } virtual double maximum() const = 0; // maximum element in the sequence virtual double last() const = 0; // last element added in the sequence // the number of elements in the sequence int num() const { return _num; } // the sum of the elements in the sequence double sum() const { return _sum; } double avg() const; // the average of the sequence double variance() const; // the variance of the sequence double sd() const; // the standard deviation of the sequence double davg() const; // decaying average double dvariance() const; // decaying variance double dsd() const; // decaying "standard deviation" // Debugging/Printing virtual void dump(); virtual void dump_on(outputStream* s); }; class NumberSeq: public AbsSeq { private: bool check_nums(NumberSeq* total, int n, NumberSeq** parts); protected: double _last; double _maximum; // keep track of maximum value public: NumberSeq(double alpha = DEFAULT_ALPHA_VALUE); NumberSeq(NumberSeq* total, int n_parts, NumberSeq** parts); virtual void add(double val); virtual double maximum() const { return _maximum; } virtual double last() const { return _last; } // Debugging/Printing virtual void dump_on(outputStream* s); }; class TruncatedSeq: public AbsSeq { private: enum PrivateConstants { DefaultSeqLength = 10 }; void init(); protected: double *_sequence; // buffers the last L elements in the sequence int _length; // this is L int _next; // oldest slot in the array, i.e. next to be overwritten public: // accepts a value for L TruncatedSeq(int length = DefaultSeqLength, double alpha = DEFAULT_ALPHA_VALUE); virtual void add(double val); virtual double maximum() const; virtual double last() const; // the last value added to the sequence double oldest() const; // the oldest valid value in the sequence double predict_next() const; // prediction based on linear regression // Debugging/Printing virtual void dump_on(outputStream* s); }; #endif // SHARE_VM_UTILITIES_NUMBERSEQ_HPP