1 /* 2 Copyright (C) 2003-2006 MySQL AB, 2009 Sun Microsystems, Inc. 3 Use is subject to license terms. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License, version 2.0, 7 as published by the Free Software Foundation. 8 9 This program is also distributed with certain software (including 10 but not limited to OpenSSL) that is licensed under separate terms, 11 as designated in a particular file or component or in included license 12 documentation. The authors of MySQL hereby grant you an additional 13 permission to link the program and your derivative works with the 14 separately licensed software that they have included with MySQL. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License, version 2.0, for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software 23 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 */ 25 26 #ifndef NDBT_STATS_HPP 27 #define NDBT_STATS_HPP 28 29 #include <ndb_global.h> 30 31 class NDBT_Stats { 32 public: NDBT_Stats()33 NDBT_Stats() { reset(); } 34 reset()35 void reset() { sum = sum2 = 0.0; max = DBL_MIN; ; min = DBL_MAX; n = 0;} 36 addObservation(double t)37 void addObservation(double t) { 38 sum+= t; 39 sum2 += (t*t); 40 n++; 41 if(min > t) min = t; 42 if(max < t) max = t; 43 } 44 addObservation(Uint64 t)45 void addObservation(Uint64 t) { addObservation(double(t)); } 46 getMean() const47 double getMean() const { return sum/n;} getStddev() const48 double getStddev() const { return sqrt(getVariance()); } getVariance() const49 double getVariance() const { return (n*sum2 - (sum*sum))/(n*n);} getMin() const50 double getMin() const { return min;} getMax() const51 double getMax() const { return max;} getCount() const52 int getCount() const { return n;} 53 operator +=(const NDBT_Stats & c)54 NDBT_Stats & operator+=(const NDBT_Stats & c){ 55 sum += c.sum; 56 sum2 += c.sum2; 57 n += c.n; 58 if(min > c.min) min = c.min; 59 if(max < c.max) max = c.max; 60 return * this; 61 } 62 private: 63 double sum; 64 double sum2; 65 int n; 66 double min, max; 67 }; 68 69 #endif 70