1 /*
   2  * Copyright (c) 2015, 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  *

  40   // it.
  41   double stddev_estimate(TruncatedSeq const* seq) const {
  42     double estimate = seq->dsd();
  43     int const samples = seq->num();
  44     if (samples < 5) {
  45       estimate = MAX2(seq->davg() * (5 - samples) / 2.0, estimate);
  46     }
  47     return estimate;
  48   }
  49  public:
  50   G1Predictions(double sigma) : _sigma(sigma) {
  51     assert(sigma >= 0.0, "Confidence must be larger than or equal to zero");
  52   }
  53 
  54   // Confidence factor.
  55   double sigma() const { return _sigma; }
  56 
  57   double get_new_prediction(TruncatedSeq const* seq) const {
  58     return seq->davg() + _sigma * stddev_estimate(seq);
  59   }
  60 
  61 #ifndef PRODUCT
  62   static void test();
  63 #endif
  64 };
  65 
  66 #endif // SHARE_VM_GC_G1_G1PREDICTIONS_HPP

   1 /*
   2  * Copyright (c) 2015, 2016, 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  *

  40   // it.
  41   double stddev_estimate(TruncatedSeq const* seq) const {
  42     double estimate = seq->dsd();
  43     int const samples = seq->num();
  44     if (samples < 5) {
  45       estimate = MAX2(seq->davg() * (5 - samples) / 2.0, estimate);
  46     }
  47     return estimate;
  48   }
  49  public:
  50   G1Predictions(double sigma) : _sigma(sigma) {
  51     assert(sigma >= 0.0, "Confidence must be larger than or equal to zero");
  52   }
  53 
  54   // Confidence factor.
  55   double sigma() const { return _sigma; }
  56 
  57   double get_new_prediction(TruncatedSeq const* seq) const {
  58     return seq->davg() + _sigma * stddev_estimate(seq);
  59   }




  60 };
  61 
  62 #endif // SHARE_VM_GC_G1_G1PREDICTIONS_HPP