0689b3df39
The statistics of the polling system no longer match the implementation it measures. Modified the statistics to better represent the new system by calculating the number of epoll events each thread receives.
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file statistics.c - Functions to aid in the compilation of statistics
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 15/06/16 Martin Brampton Removed some functions to statistics.h for inline
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*
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* @endverbatim
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*/
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#include <maxscale/statistics.h>
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#include <string.h>
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#include <maxscale/alloc.h>
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#include <maxscale/config.h>
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#include <maxscale/debug.h>
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#include <maxscale/platform.h>
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static int thread_count = 0;
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static bool stats_initialized = false;
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/**
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* @brief Initialize the statistics gathering
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*/
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void ts_stats_init()
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{
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ss_dassert(!stats_initialized);
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thread_count = config_threadcount();
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stats_initialized = true;
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}
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/**
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* @brief End the statistics gathering
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*/
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void ts_stats_end()
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{
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ss_dassert(stats_initialized);
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}
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/**
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* @brief Create a new statistics object
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*
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* @return New stats_t object or NULL if memory allocation failed
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*/
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ts_stats_t ts_stats_alloc()
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{
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ss_dassert(stats_initialized);
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return MXS_CALLOC(thread_count, sizeof(int64_t));
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}
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/**
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* Free a statistics object
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*
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* @param stats Stats to free
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*/
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void ts_stats_free(ts_stats_t stats)
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{
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ss_dassert(stats_initialized);
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MXS_FREE(stats);
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}
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/**
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* @brief Read the total value of the statistics object
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*
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* Add up the individual thread statistics to get the total for all threads.
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*
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* @param stats Statistics to read
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* @return Value of statistics
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*/
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int64_t ts_stats_sum(ts_stats_t stats)
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{
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ss_dassert(stats_initialized);
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int64_t sum = 0;
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for (int i = 0; i < thread_count; i++)
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{
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sum += ((int64_t*)stats)[i];
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}
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return sum;
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}
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/**
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* @brief Read the value of the statistics object
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*
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* Calculate
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*
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* @param stats Statistics to read
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* @param type The statistics type
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* @return Value of statistics
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*/
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int64_t ts_stats_get(ts_stats_t stats, enum ts_stats_type type)
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{
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ss_dassert(stats_initialized);
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int64_t best = type == TS_STATS_MAX ? LONG_MIN : (type == TS_STATS_MIX ? LONG_MAX : 0);
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for (int i = 0; i < thread_count; i++)
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{
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int64_t value = ((int64_t*)stats)[i];
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switch (type)
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{
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case TS_STATS_MAX:
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if (value > best)
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{
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best = value;
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}
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break;
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case TS_STATS_MIX:
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if (value < best)
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{
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best = value;
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}
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break;
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case TS_STATS_AVG:
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case TS_STATS_SUM:
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best += value;
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break;
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}
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}
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return type == TS_STATS_AVG ? best / thread_count : best;
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}
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