Bug #73678 [Opn->Nab]: Strange performance degradation

Edit report at https://bugs.php.net/bug.php?id=73678&edit=1 ID: 73678 Updated by: ab@php.net Reported by: riggsfolly at gmail dot com Summary: Strange performance degradation -Status: Open +Status: Not a bug Type: Bug Package: Performance problem Operating System: Windows PHP Version: 7.1.0 Block user comment: N Private report: N New Comment: Thanks, so this is cleared. Previous Comments: ------------------------------------------------------------------------ [2016-12-08 12:44:21] riggsfolly at gmail dot com Hi Guys, Yes, very sorry for wasting your time. As suggested XDEBUG was involved, and was the reason for the timings. Run without XDEBUG and received very similiar timings to yours. Still I learnt something from this, XDEBUG does carry a suprisingly large overhead. Without XDEBUG 7.1.0 Using (object) [] method 10000000 times 1.8600029945374 Using new stdClass() method 10000000 times 3.200003862381 Difference (-ve) means (object) [] is quicker -1.3400008678436 7.0.14 Using (object) [] method 10000000 times 2.5900039672852 Using new stdClass() method 10000000 times 3.7700049877167 Difference (-ve) means (object) [] is quicker -1.1800010204315 In fact 7.1.0 seems to be faster that 7.0.14 ------------------------------------------------------------------------ [2016-12-08 11:43:37] ab@php.net Same here, degradation of 7.0, neither with 7.1 or master. Thanks. ------------------------------------------------------------------------ [2016-12-07 20:06:15] nikic@php.net Cannot reproduce. Ubuntu: PHP 7.0: nikic@saturn:~/php-7.0-fast$ sapi/cli/php -n t007.php Using (object) [] method 10000000 times 0.77149391174316 Using new stdClass() method 10000000 times 1.3405849933624 PHP 7.1: Using (object) [] method 10000000 times 0.71639490127563 Using new stdClass() method 10000000 times 1.1726460456848 Windows (x64 nts): PHP 7.0: Using (object) [] method 10000000 times 1.0753118991852 Using new stdClass() method 10000000 times 1.6590139865875 PHP 7.1: Using (object) [] method 10000000 times 0.99693298339844 Using new stdClass() method 10000000 times 1.4866938591003 Please make sure that you do not have XDebug enabled. ------------------------------------------------------------------------ [2016-12-07 19:39:42] riggsfolly at gmail dot com Description: ------------ I was using this script to benchmark a question on StackOverflow and I noticed that in PHP 7.1.0 the creation of a stdClass() object increased in time taken by an appreciable amount between PHP7.0.13 and PHP7.1.0 This seemed rather odd based on all the speed improvment work done in 7.0 and 7.1 so I thought I would report it, in case it pointed someone at something that may have changed in 7.1 to the damage a speed improvement. Results for different versions of PHP PHP7.1.0 Using (object) [] method 10,000,000 times 22.970033168793 Using new stdClass() method 10,000,000 times 38.114390850067 Difference (-ve) means (object) [] is quicker -15.144357681274 PHP7.0.13 Using (object) [] method 10,000,000 times 22.230031967163 Using new stdClass() method 10,000,000 times 29.300040960312 Difference (-ve) means (object) [] is quicker -7.0700089931488 PHP5.6.25 Using (object) [] method 10,000,000 times 47.920066833496 Using new stdClass() method 10,000,000 times 54.20007610321 Difference (-ve) means (object) [] is quicker -6.2800092697144 PHP5.5.36 Using (object) [] method 10,000,000 times 46.450064897537 Using new stdClass() method 10,000,000 times 53.110074043274 Difference (-ve) means (object) [] is quicker -6.6600091457367 Test script: --------------- function one() { $obj = (object) ['prop1' => 1, 'prop2' => 2]; return $obj; } function two() { $obj = new stdClass(); $obj->prop1 = 1; $obj->prop2 = 2; return $obj; } $looper = 10000000; $a = microtime(1); for ( $i=0; $i < $looper; $i++) { $x = one(); } $b = microtime(1); $c = $b-$a; echo "Using (object) [] method $looper times " . $c . PHP_EOL; $a = microtime(1); for ( $i=0; $i < $looper; $i++) { $x = two(); } $b = microtime(1); $d = $b-$a; echo "Using new stdClass() method $looper times " . $d . PHP_EOL; echo 'Difference (-ve) means (object) [] is quicker ' . ($c - $d) . PHP_EOL; ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73678&edit=1