ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 6169d5f | 2016-03-31 07:46:18 -0700 | [diff] [blame] | 3 | * Copyright 2015, Google Inc. |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 34 | #include "src/core/lib/iomgr/time_averaged_stats.h" |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 35 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 36 | void grpc_time_averaged_stats_init(grpc_time_averaged_stats* stats, |
| 37 | double init_avg, double regress_weight, |
| 38 | double persistence_factor) { |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 39 | stats->init_avg = init_avg; |
| 40 | stats->regress_weight = regress_weight; |
| 41 | stats->persistence_factor = persistence_factor; |
| 42 | stats->batch_total_value = 0; |
| 43 | stats->batch_num_samples = 0; |
| 44 | stats->aggregate_total_weight = 0; |
| 45 | stats->aggregate_weighted_avg = init_avg; |
| 46 | } |
| 47 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 48 | void grpc_time_averaged_stats_add_sample(grpc_time_averaged_stats* stats, |
| 49 | double value) { |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 50 | stats->batch_total_value += value; |
| 51 | ++stats->batch_num_samples; |
| 52 | } |
| 53 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 54 | double grpc_time_averaged_stats_update_average( |
| 55 | grpc_time_averaged_stats* stats) { |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 56 | /* Start with the current batch: */ |
| 57 | double weighted_sum = stats->batch_total_value; |
| 58 | double total_weight = stats->batch_num_samples; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 59 | if (stats->regress_weight > 0) { |
| 60 | /* Add in the regression towards init_avg_: */ |
| 61 | weighted_sum += stats->regress_weight * stats->init_avg; |
| 62 | total_weight += stats->regress_weight; |
| 63 | } |
| 64 | if (stats->persistence_factor > 0) { |
| 65 | /* Add in the persistence: */ |
| 66 | const double prev_sample_weight = |
| 67 | stats->persistence_factor * stats->aggregate_total_weight; |
| 68 | weighted_sum += prev_sample_weight * stats->aggregate_weighted_avg; |
| 69 | total_weight += prev_sample_weight; |
| 70 | } |
| 71 | stats->aggregate_weighted_avg = |
| 72 | (total_weight > 0) ? (weighted_sum / total_weight) : stats->init_avg; |
ctiller | c1ddffb | 2014-12-15 13:08:18 -0800 | [diff] [blame] | 73 | stats->aggregate_total_weight = total_weight; |
| 74 | stats->batch_num_samples = 0; |
| 75 | stats->batch_total_value = 0; |
| 76 | return stats->aggregate_weighted_avg; |
Craig Tiller | 190d360 | 2015-02-18 09:23:38 -0800 | [diff] [blame] | 77 | } |