Edit report at https://bugs.php.net/bug.php?id=76867&edit=1
ID: 76867
Comment by: spam2 at rhsoft dot net
Reported by: ivokund at gmail dot com
Summary: Extremely slow performance
Status: Open
Type: Bug
Package: Performance problem
Operating System: Ubuntu 18.04.1 LTS
PHP Version: 7.2.9
Block user comment: N
Private report: N
New Comment:
i don't get the impact completly
huge pages are assumed to be faster and PHP also has --enable-huge-code-pages for opcache - would it
be better to change that also to --disable-huge-code-pages while not sure if that is using
transparent or "dedicated" huge-pages which won't work anyways without epxlicit admin
dance (see mysql and huge pages)
Previous Comments:
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[2018-09-20 12:51:20] lyrixx at lyrixx dot info
Hello,
I got the same problem. I don't know why since I just update PHP to 7.2.10
Anyway, I executed hugeadm --thp-never and the issue seems to be fixed.
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[2018-09-13 15:52:35] ivokund at gmail dot com
I disabled huge pages with "hugeadm --thp-never" and the problem disappeared instantly.
I'm happy now, so if this is not a PHP issue then please close the issue.
Thanks for your help everyone!
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[2018-09-13 15:17:58] requinix@php.net
I don't believe USE_ZEND_ALLOC_HUGE_PAGES will control PHP's use of madvise. Try disabling
transparent huge pages in your kernel.
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[2018-09-13 15:02:49] ivokund at gmail dot com
Ok, got some new information. This is the first time I hear about huge pages, so pretty sure, I
haven't configured anything on purpose.
Setting USE_ZEND_ALLOC_HUGE_PAGES=0 in environment does not seem to have any effect.
_______________
$ export USE_ZEND_ALLOC_HUGE_PAGES=0
$ echo $USE_ZEND_ALLOC_HUGE_PAGES
0
$ time php -n --version
PHP 7.2.9-1+ubuntu18.04.1+deb.sury.org+1 (cli) (built: Aug 19 2018 07:16:54) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
real 0m10,453s
user 0m0,049s
sys 0m0,024s
_______________
Here is a complete output from "strace php -n --version" with USE_ZEND_ALLOC_HUGE_PAGES=0
https://pastebin.com/raw/Cnmvarqd
Any further ideas would be greatly appreciated!
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[2018-09-13 06:22:27] ivokund at gmail dot com
The manifestation of this problem apparently also varies daily, as I'm having trouble
reproducing it today (although, there have been no reboots).
I'll continue debugging as soon as the problem returns and will get back to you.
Thanks for your help so far!
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