Bug #74976 [Com]: processes in uninterruptible sleep when disk usage (backup)

From: Date: Thu, 24 May 2018 20:51:23 +0000
Subject: Bug #74976 [Com]: processes in uninterruptible sleep when disk usage (backup)
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-215360@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=74976&edit=1

 ID:                 74976
 Comment by:         gadelat at gmail dot com
 Reported by:        sergo44 at mail dot ru
 Summary:            processes in uninterruptible sleep when disk usage
                     (backup)
 Status:             Open
 Type:               Bug
 Package:            Performance problem
 Operating System:   Debian 7.11 x64
 PHP Version:        7.0.21
 Block user comment: N
 Private report:     N

 New Comment:

Are you using btrfs by a chance? I started having this problem too, but for php cli 7.2.5, since I
started using Fedora 28 with btrfs. Previously, I had Ubuntu 17.10 with ext4 and had no such issues.


Previous Comments:
------------------------------------------------------------------------
[2017-07-24 07:35:31] sergo44 at mail dot ru

Description:
------------
Hello.

Debian 7.11 x64 with nginx.

I am building php7 with this configure options:
./configure --prefix="$PREFIX"\
        --enable-cgi \
        --enable-static \
        \
        --enable-mbstring \
        --enable-soap \
        --enable-zip \
        --enable-calendar\
        --enable-sockets\
        --enable-bcmath\
        \
        --with-zlib\
        --with-openssl=/opt/openssl \
        --with-curl=/opt/curl \
        --with-gettext=shared \
        \
        --with-gd=shared \
        --enable-gd-native-ttf \
        --with-freetype-dir=/usr \
        \
        --with-mcrypt \
        --with-mysqli \
        --with-pdo-mysql \
        \
        --with-jpeg-dir=/usr \
        --with-png-dir=/usr \
        --with-config-file-path="$CFG" \
        --with-config-file-scan-dir="$CFG/conf.d" \
        --enable-fpm



When server backup and disk using
1. If php as CGI - too more PHP CGI process is in uninterruptible sleep with hight LA (50)
2. If php as FPM - too more PHP FPM workers is in uninterruptible sleep with hight LA (50)

PHP-FPM LOG:
[19-Jan-2017 05:22:55] WARNING: [pool avtovokzal] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 0 idle, and 48 total
children
[19-Jan-2017 05:22:56] WARNING: [pool avtovokzal] seems busy (you may need to increase
pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 0 idle, and 49 total
children
[19-Jan-2017 05:22:57] WARNING: [pool avtovokzal] server reached pm.max_children setting (50),
consider raising it

Then I added events.mechanism = epoll to php-fpm.conf the problem solved, but not for CGI.





------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=74976&edit=1

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