Edit report at https://bugs.php.net/bug.php?id=74929&edit=1
ID: 74929
Updated by: ab@php.net
Reported by: andxfiles at gmail dot com
Summary: mbstring functions version 7.1.1 are slow compared
to 5.3 on Windows
Status: Feedback
Type: Bug
Package: mbstring related
Operating System: Windows
PHP Version: 7.1.7
Block user comment: N
Private report: N
New Comment:
@andxfiles, Nikita made quite a few improvements to ext mbstring in master, see bug #74933. I'd
say, it would make sense to check some latest master snapshot, to fetch here http://windows.php.net/snapshots/ . We also work on a
new PGO approach, so further improvements are to come.
Thanks.
Previous Comments:
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[2017-07-23 03:14:28] andxfiles at gmail dot com
Both versions of php are Non Thread Safe. Windows version is: Windows Server 2012 Standard 64bit.
However, a user on stackoverflow (link in previous comment) has replicated it in Windows 7 as well.
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[2017-07-22 12:22:34] ab@php.net
Ok. As a followup - both use same flavor TS/NTS? Both tested on the same machine? Which exact Widows
version?
Thanks.
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[2017-07-22 10:45:39] andxfiles at gmail dot com
In both cases I'm using 32bit versions of php. One case is php 5.3.28 and the other is 7.1.1.
The OS is Windows, the problem does not seem to exist under Linux. Both versions are installed via
Web Platform Installer from within IIS.
Other people have been able to reproduce it: https://stackoverflow.com/questions/45028018/php-7-mb-multibyte-functions-are-60-slower-than-in-5-3-possibly-windows-on
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[2017-07-22 08:47:18] ab@php.net
Thanks for the report. Do you use a 64-bit build of PHP 7? If so, please compare with a 32-bit
build. I basically can't reproduce such a big discrepancy, but otherwise it could be possible a
64-bit build would be slower a little bit.
Thanks.
------------------------------------------------------------------------
[2017-07-15 13:29:13] andxfiles at gmail dot com
Description:
------------
PHP's 7.1.1 mb_ (multibyte) functions are ~60% slower compared to PHP 5.3. Example of such
functions: mb_strlen, mb_stripos, mb_substr. This affects Windows only. On Linux they seem to be way
faster compared to PHP 5.3 and there is no such issue. PHP's 7.1.1 installation was done via
WebPI (IIS).
Test script:
---------------
<?php
$starttime = microtime(true);
for ($i=0; $i<100000; $i++) {
$a = mb_strlen("fdsfdssdfoifjosdifjosdifjosdij:ά", "UTF-8");
}
$finishtime = microtime(true);
echo "mb_strlen: " . number_format($finishtime - $starttime, 4)*1000 ."
milliseconds<br/>";
$starttime = microtime(true);
for ($i=0; $i<100000; $i++) {
$a = mb_stripos("fdsfdssdfoifjosdifjosdifjosdij:ά", "α", 0,
"UTF-8");
}
$finishtime = microtime(true);
echo "mb_stripos: " . number_format($finishtime - $starttime, 4)*1000 ."
milliseconds<br/>";
$starttime = microtime(true);
for ($i=0; $i<100000; $i++) {
$a = mb_substr("fdsfdssdfoifjosdifjosdifjosdij:ά", $i, 1, "UTF-8");
}
$finishtime = microtime(true);
echo "mb_substr: " . number_format($finishtime - $starttime, 4)*1000 ."
milliseconds<br/>";
?>
Expected result:
----------------
php 5.3.28
mb_strlen: 250 milliseconds
mb_stripos: 3078.1 milliseconds
mb_substr: 281.3 milliseconds
php 7.1.1
mb_strlen: 406.3 milliseconds
mb_stripos: 4796.9 milliseconds
mb_substr: 421.9 milliseconds
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=74929&edit=1