Bug #70341 [Fbk->Nab]: Weird behaviour of memory_get and peak_usage

Edit report at https://bugs.php.net/bug.php?id=70341&edit=1 ID: 70341 Updated by: cmb@php.net Reported by: quantuumsnot at gmail dot com Summary: Weird behaviour of memory_get and peak_usage -Status: Feedback +Status: Not a bug Type: Bug Package: *General Issues Operating System: windows 7 x64 PHP Version: 7.0.0RC1 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Yes, that is exactly what is reported on <https://3v4l.org/COXWa> for PHP 7. However, 2097152 / 1024 / 1024 = 2 Previous Comments: ------------------------------------------------------------------------ [2015-08-27 14:40:35] quantuumsnot at gmail dot com UBench returns this on my setup (nothing changed): 2.00Mb 2097152 2.000Mb 2.00Mb ------------------------------------------------------------------------ [2015-08-27 10:17:54] cmb@php.net You have claimed > The fix is to use at line #1 memory_get_usage(false) which > returns 40-50 times!!! bigger memory usage (for example > 1.6-1.8MB instead of 40-45KB) and later corrected > using false gives me 0 bytes, using true gives me a rly big > difference in bytes used However, <https://3v4l.org/COXWa> doesn't show this behavior. ------------------------------------------------------------------------ [2015-08-27 01:44:27] quantuumsnot at gmail dot com https://3v4l.org/COXWa ------------------------------------------------------------------------ [2015-08-26 20:50:47] cmb@php.net > Tested it on 3v4l.org and the results are the same, 5.5.0-5.6.12 always win Can you please post a link to the 3v4l.org test? ------------------------------------------------------------------------ [2015-08-26 20:34:24] quantuumsnot at gmail dot com This problem is valid for devster's 'Ubench' script too: --- <?php error_reporting(-1); ini_set('display_errors', '1'); ini_set('display_startup_errors', '1'); mb_internal_encoding('UTF-8'); mb_http_output('UTF-8'); gc_enable(); // https://github.com/devster/ubench require_once 'src/Ubench.php'; $bench = new Ubench; $testSum = 0; $bench->start(); // Execute some code for ($i = 0; $i < 1000000; $i++) { $j= $i; } $bench->end(); // Get elapsed time and memory echo "<br />" . $bench->getTime(); echo "<br />" . $bench->getTime(true); // elapsed microtime in float echo "<br />" . $bench->getTime(false, '%d%s'); echo "<br />" . $bench->getMemoryPeak(); echo "<br />" . $bench->getMemoryPeak(true); // memory peak in bytes echo "<br />" . $bench->getMemoryPeak(false, '%.3f%s'); // Returns the memory usage at the end mark echo "<br />" . $bench->getMemoryUsage(); exit(); ?> ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=70341 -- Edit this bug report at https://bugs.php.net/bug.php?id=70341&edit=1