80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
/* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file storage/perfschema/pfs_histogram.cc
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Miscellaneous global dependencies (implementation).
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*/
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#include "storage/perfschema/pfs_histogram.h"
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/**
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Histogram base bucket timer, in picoseconds.
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Currently defined as 10 micro second.
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*/
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#define BUCKET_BASE_TIMER (10 * 1000 * 1000)
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/**
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Bucket factor.
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histogram_timer[i+1] = BUCKET_BASE_FACTOR * histogram_timer[i]
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The value is chosen so that BUCKET_BASE_FACTOR ^ 50 = 10,
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which corresponds to a 4.7 percent increase for each bucket,
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or a power of 10 increase for 50 buckets.
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*/
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#define BUCKET_BASE_FACTOR 1.0471285480508996
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/**
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Timer values used in histograms.
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Timer values are expressed in picoseconds.
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timer[0] = 0
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timer[1] = BUCKET_BASE_TIMER
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From then,
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timer[N+1] = BUCKET_BASE_FACTOR * timer[N]
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The last timer is set to infinity.
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*/
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PFS_histogram_timers g_histogram_pico_timers;
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void PFS_histogram::reset() {
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ulong bucket_index;
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for (bucket_index = 0; bucket_index < NUMBER_OF_BUCKETS; bucket_index++) {
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m_bucket[bucket_index] = 0;
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}
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}
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void PFS_histogram_timers::init() {
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ulong bucket_index;
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double current_bucket_timer = BUCKET_BASE_TIMER;
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m_bucket_timer[0] = 0;
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for (bucket_index = 1; bucket_index < NUMBER_OF_BUCKETS; bucket_index++) {
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m_bucket_timer[bucket_index] = current_bucket_timer;
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current_bucket_timer *= BUCKET_BASE_FACTOR;
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}
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m_bucket_timer[NUMBER_OF_BUCKETS] = UINT64_MAX;
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}
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