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/* Copyright (c) 2016, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program 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 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file storage/perfschema/pfs_histogram.cc
Miscellaneous global dependencies (implementation).
*/
#include "storage/perfschema/pfs_histogram.h"
/**
Histogram base bucket timer, in picoseconds.
Currently defined as 10 micro second.
*/
#define BUCKET_BASE_TIMER (10 * 1000 * 1000)
/**
Bucket factor.
histogram_timer[i+1] = BUCKET_BASE_FACTOR * histogram_timer[i]
The value is chosen so that BUCKET_BASE_FACTOR ^ 50 = 10,
which corresponds to a 4.7 percent increase for each bucket,
or a power of 10 increase for 50 buckets.
*/
#define BUCKET_BASE_FACTOR 1.0471285480508996
/**
Timer values used in histograms.
Timer values are expressed in picoseconds.
timer[0] = 0
timer[1] = BUCKET_BASE_TIMER
From then,
timer[N+1] = BUCKET_BASE_FACTOR * timer[N]
The last timer is set to infinity.
*/
PFS_histogram_timers g_histogram_pico_timers;
void PFS_histogram::reset() {
ulong bucket_index;
for (bucket_index = 0; bucket_index < NUMBER_OF_BUCKETS; bucket_index++) {
m_bucket[bucket_index] = 0;
}
}
void PFS_histogram_timers::init() {
ulong bucket_index;
double current_bucket_timer = BUCKET_BASE_TIMER;
m_bucket_timer[0] = 0;
for (bucket_index = 1; bucket_index < NUMBER_OF_BUCKETS; bucket_index++) {
m_bucket_timer[bucket_index] = current_bucket_timer;
current_bucket_timer *= BUCKET_BASE_FACTOR;
}
m_bucket_timer[NUMBER_OF_BUCKETS] = UINT64_MAX;
}
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