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<?php
/**
* Helper for determining system memory usage
*
* Uses OS tools to provide accurate information about factual memory consumption.
* The PHP standard functions may return incorrect information because the process itself may have leaks.
*
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\TestFramework\Helper;
/**
* Integration Test Framework memory management logic.
*/
class Memory
{
/**
* Prefixes to specify unit of measure for memory amount
*
* Warning: it is important to maintain the exact order of letters in this literal,
* as it is used to convert string with units to bytes
*/
const MEMORY_UNITS = 'BKMGTPE';
/**
* @var \Magento\Framework\Shell
*/
private $_shell;
/**
* Inject dependencies
*
* @param \Magento\Framework\Shell $shell
*/
public function __construct(\Magento\Framework\Shell $shell)
{
$this->_shell = $shell;
}
/**
* Retrieve the effective memory usage of the current process
*
* Function memory_get_usage() cannot be used because of the bug
*
* @link https://bugs.php.net/bug.php?id=62467
* @return int Memory usage in bytes
*/
public function getRealMemoryUsage()
{
$pid = getmypid();
try {
// fall back to the Unix command line
$result = $this->_getUnixProcessMemoryUsage($pid);
} catch (\Magento\Framework\Exception\LocalizedException $e) {
// try to use the Windows command line
// some ports of Unix commands on Windows, such as MinGW, have limited capabilities and cannot be used
$result = $this->_getWinProcessMemoryUsage($pid);
}
return $result;
}
/**
* Retrieve the current process' memory usage using Unix command line interface
*
* @link http://linux.die.net/man/1/ps
* @param int $pid
* @return int Memory usage in bytes
*/
protected function _getUnixProcessMemoryUsage($pid)
{
// RSS - resident set size, the non-swapped physical memory
$command = 'ps --pid %s --format rss --no-headers';
if ($this->isMacOS()) {
$command = 'ps -p %s -o rss=';
}
$output = $this->_shell->execute($command, [$pid]);
$result = $output . 'k';
// kilobytes
return self::convertToBytes($result);
}
/**
* Retrieve the current process' memory usage using Windows command line interface
*
* @link http://technet.microsoft.com/en-us/library/bb491010.aspx
* @param int $pid
* @return int Memory usage in bytes
*/
protected function _getWinProcessMemoryUsage($pid)
{
$output = $this->_shell->execute('tasklist.exe /fi %s /fo CSV /nh', ["PID eq {$pid}"]);
$arr = str_getcsv($output);
$memory = $arr[4];
return self::convertToBytes($memory);
}
/**
* Convert a number optionally followed by the unit symbol (B, K, M, G, etc.) to bytes
*
* @param string $number String representation of a number
* @return int
* @throws \InvalidArgumentException
* @throws \OutOfBoundsException
* phpcs:disable Magento2.Functions.StaticFunction
*/
public static function convertToBytes($number)
{
// phpcs:enable Magento2.Functions.StaticFunction
if (!preg_match('/^(.*\d)\h*(\D)$/', $number, $matches)) {
throw new \InvalidArgumentException("Number format '{$number}' is not recognized.");
}
$unitSymbol = strtoupper($matches[2]);
if (false === strpos(self::MEMORY_UNITS, $unitSymbol)) {
throw new \InvalidArgumentException("The number '{$number}' has an unrecognized unit: '{$unitSymbol}'.");
}
$result = self::_convertToNumber($matches[1]);
$pow = $unitSymbol ? strpos(self::MEMORY_UNITS, $unitSymbol) : 0;
$is32Bit = PHP_INT_SIZE == 4;
if ($is32Bit && $pow >= 4) {
throw new \OutOfBoundsException("A 32-bit system is unable to process such a number.");
}
if ($unitSymbol) {
$result *= pow(1024, $pow);
}
return (int)$result;
}
/**
* Remove non-numeric characters in the string to cast it to a numeric value
*
* Incoming number can be presented in arbitrary format that depends on locale. We don't possess locale information.
* So the best can be done is to treat number as an integer and eliminate delimiters.
* Method will not behave correctly with non-integer numbers for the following reason:
* - if value has more than one delimiter, such as in French notation: "1 234,56" -- then we can infer decimal part
* - but the value has only one delimiter, such as "234,56", then it is impossible to know whether it is decimal
* separator or not. Only knowing the right format would allow this.
*
* @param string $number
* @return string
* @throws \InvalidArgumentException
* phpcs:disable Magento2.Functions.StaticFunction
*/
protected static function _convertToNumber($number)
{
// phpcs:enable Magento2.Functions.StaticFunction
preg_match_all('/(\D+)/', $number, $matches);
if (count(array_unique($matches[0])) > 1) {
throw new \InvalidArgumentException(
"The number '{$number}' seems to have decimal part. Only integer numbers are supported."
);
}
return preg_replace('/\D+/', '', $number);
}
/**
* Whether the operating system belongs to the Mac family
*
* @link http://php.net/manual/en/function.php-uname.php
* @return boolean
* phpcs:disable Magento2.Functions.StaticFunction
*/
public static function isMacOs()
{
// phpcs:enable Magento2.Functions.StaticFunction
return strtoupper(PHP_OS) === 'DARWIN';
}
}