152 lines
4.1 KiB
PHP
152 lines
4.1 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2017,2020, Matias De lellis <mati86dl@gmail.com>
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* @copyright Copyright (c) 2018-2019, Branko Kokanovic <branko@kokanovic.org>
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*
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* @author Branko Kokanovic <branko@kokanovic.org>
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*
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* @license GNU AGPL version 3 or any later version
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*
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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 Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OCA\FaceRecognition\Helper;
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use OCA\FaceRecognition\Service\SettingsService;
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/**
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* Tries to get total amount of memory on the host, given to PHP.
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*/
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class MemoryLimits {
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/**
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* Tries to get memory available to PHP. This is highly speculative business.
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* It will first try reading value of "memory_limit" and if it is -1, it will
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* try to get 1/2 memory of host system. In case of any error, it will return
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* negative value. Note that negative here doesn't mean "unlimited"! This
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* function doesn't care if PHP is being used in CLI or FPM mode.
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*
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* @return float Total memory available to PHP, in bytes, or negative if
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* we don't know any better
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*/
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public static function getAvailableMemory(): float {
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// Try first to get from php.ini
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$availableMemory = MemoryLimits::getPhpMemory();
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// php.ini says that memory_limit is -1, which means unlimited.
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// We need to get memory from system (if OS is supported here).
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// Only linux is currently supported.
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if ($availableMemory < 0) {
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$systemMemory = MemoryLimits::getSystemMemory();
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if ($systemMemory < 0)
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return -1;
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$availableMemory = ($systemMemory * 2 / 3);
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$availableMemory = min($availableMemory, SettingsService::MAXIMUN_ASSIGNED_MEMORY);
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}
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return $availableMemory;
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}
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/**
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* Tries to get memory available to PHP reading value of "memory_limit".
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*
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* @return float Total memory available to PHP, in bytes, or negative if
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* we don't know any better or it is unlimited.
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*/
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public static function getPhpMemory(): float {
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// Get from php.ini
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try {
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$ini_value = ini_get('memory_limit');
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$availableMemory = MemoryLimits::returnBytes($ini_value);
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} catch (\Exception $e) {
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$availableMemory = -1;
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}
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return $availableMemory;
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}
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/**
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* @return float Total memory available on system, in bytes, or negative if
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* we don't know any better
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* Only linux is currently supported.
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*/
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public static function getSystemMemory(): float {
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if (php_uname("s") !== "Linux")
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return -1;
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$linuxMemory = MemoryLimits::getTotalMemoryLinux();
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if ($linuxMemory <= 0) {
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return -2;
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}
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return $linuxMemory;
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}
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/**
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* @return float Total memory available on linux system, in bytes, or
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* zero if we don't know any better.
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*/
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private static function getTotalMemoryLinux(): float {
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$fh = fopen('/proc/meminfo','r');
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if ($fh === false) {
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return 0;
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}
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$mem = 0;
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while ($line = fgets($fh)) {
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$pieces = array();
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if (preg_match('/^MemTotal:\s+(\d+)\skB$/', $line, $pieces)) {
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$mem = $pieces[1];
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break;
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}
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}
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fclose($fh);
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return $mem * 1024;
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}
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/**
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* Converts shorthand memory notation value to bytes
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* From http://php.net/manual/en/function.ini-get.php
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*
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* @param string $val Memory size shorthand notation string
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*
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* @return int Value in integers (bytes)
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*/
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public static function returnBytes(string $val): int {
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$val = trim($val);
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if ($val === "") {
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return 0;
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}
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$valInt = intval($val);
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if ($valInt === 0) {
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return 0;
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}
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$last = strtolower($val[strlen($val)-1]);
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switch($last) {
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case 'g':
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$valInt *= 1024;
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// Fallthrough on purpose
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case 'm':
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$valInt *= 1024;
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// Fallthrough on purpose
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case 'k':
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$valInt *= 1024;
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}
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return $valInt;
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}
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} |