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<?php |
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/** |
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* @copyright Copyright (c) 2017,2020, Matias De lellis <[email protected]> |
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* @copyright Copyright (c) 2018-2019, Branko Kokanovic <[email protected]> |
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* |
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* @author Branko Kokanovic <[email protected]> |
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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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/** |
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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 int 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(): int { |
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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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$availableMemory = intval($systemMemory / 2); |
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} |
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return $availableMemory; |
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} |
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/** |
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* Tries to get memory available to PHP reading value of "memory_limit". |
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* |
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* @return int Total memory available to PHP, in bytes, or negative if |
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* we don't know any better or it is unlimited. |
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*/ |
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public static function getPhpMemory(): int { |
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// Get from php.ini |
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try { |
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$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 $availableMemory; |
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} |
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/** |
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* @return int Total memory available on system, in bytes, or negative if |
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* we don't know any better |
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* Only linux is currently supported. |
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*/ |
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public static function getSystemMemory(): int { |
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if (php_uname("s") !== "Linux") |
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return -1; |
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$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 $linuxMemory; |
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} |
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/** |
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* @return int Total memory available on linux system, in bytes, or |
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* zero if we don't know any better. |
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*/ |
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private static function getTotalMemoryLinux(): int { |
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$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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$memKb = intval($mem); |
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return intval($memKb * 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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1 |
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public static function returnBytes(string $val): int { |
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1 |
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$val = trim($val); |
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1 |
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if ($val === "") { |
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1 |
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return 0; |
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} |
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1 |
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$valInt = intval($val); |
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1 |
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if ($valInt === 0) { |
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1 |
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return 0; |
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} |
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1 |
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$last = strtolower($val[strlen($val)-1]); |
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switch($last) { |
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1 |
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case 'g': |
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1 |
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$valInt *= 1024; |
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// Fallthrough on purpose |
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1 |
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case 'm': |
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1 |
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$valInt *= 1024; |
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// Fallthrough on purpose |
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1 |
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case 'k': |
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1 |
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$valInt *= 1024; |
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} |
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1 |
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return $valInt; |
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} |
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} |
matiasdelellis /
facerecognition
