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Redis and wordpress

Discussion in 'Blogs & CMS usage' started by ahmed, Mar 26, 2017.

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  1. Mar 26, 2017 #1
    ahmed

    ahmed Active Member

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    Hello

    I have this warning:

    Code:
    15634:M 26 Mar 00:16:46.679 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

    I have Nginx 1.11.12 with brotli
    Php 7.1.3
    openssl "getting ready for TLS 1.3 :)"

    -did i do something wrong? or this need to be set by default inside centminmod?
     
  2. Mar 26, 2017 #2
    eva2000

    eva2000 Administrator Staff Member

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    You can only disable Transparent Huge Pages on non-OpenVZ systems. Where are you seeing this error message ?

    On Centmin Mod 123.09beta01 php upgrades will usually detect if redis server is installed and auto disable Transparent Huge Pages if you are on non-OpenVZ systems, i.e. dedicated, kvm, xen, vmware.

    On Centmin Mod 123.09beta01, you can also run /usr/local/src/centminmod/tools/hptweaks.sh script https://community.centminmod.com/threads/transparent-huge-pages-tweaks-tools-hptweaks-sh.5340/ to take care of it if on non-OpenVZ systems.
     
  3. Mar 26, 2017 #3
    ahmed

    ahmed Active Member

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    ok, that makes since

    the script comes when I run
    tail -50 /var/log/redis/redis.log

    ---
    I upgraded php, and then installed wordpress for a domian (without redis
    then installed another domain with redis)

    ---
    I will re-compile php
     
  4. Mar 26, 2017 #4
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
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    to save time just run /usr/local/src/centminmod/tools/hptweaks.sh unless upgrading php for new version too
     
  5. Mar 26, 2017 #5
    ahmed

    ahmed Active Member

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    recompiled, rebooted the VPS, still the warning msg

    the command u advised shows:

    Code:
    [12:33][root@wordpress1 Ahmed]# sh /usr/local/src/centminmod/tools/hptweaks.sh


transparent huge pages not supported

no tweaks needed
     
  6. Mar 26, 2017 #6
    ahmed

    ahmed Active Member

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    I added
    echo never > /sys/kernel/mm/transparent_hugepage/enabled
    to
    /etc/rc.local
     
  7. Mar 26, 2017 #7
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    did you restart redis server after the change ?

    hptweaks.sh look for the setting in /sys/kernel/mm/redhat_transparent_hugepage/enabled
    Code (Text):
    cat /sys/kernel/mm/redhat_transparent_hugepage/enabled
always madvise [never]

    which seems to be same as at /sys/kernel/mm/transparent_hugepage/enabled
    Code (Text):
    cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]

    but if it doesn't exist at /sys/kernel/mm/redhat_transparent_hugepage/enabled that system returns transparent huge pages not supported

    also are you on openvz vps ? if so you can't change such settings and have to live with lower performance of redis on openvz vps with transparent huge pages enabled
     
  8. Mar 26, 2017 #8
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
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    seems CentOS 7 doesn't have /sys/kernel/mm/redhat_transparent_hugepage/enabled only
    /sys/kernel/mm/transparent_hugepage/enabled !

    edit: just updated 123.09beta01 with fix for that so another bug squashed :)
     
  9. Mar 26, 2017 #9
    ahmed

    ahmed Active Member

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    Although I can barely understand what u are syaing but looks like I discovered somthing new :)

    the
    Code:
    I added 
echo never > /sys/kernel/mm/transparent_hugepage/enabled
to 
/etc/rc.local
    fixed the redis warning, am I good now?
    I noticed that the backend of wordpress is slower, but it is not related to the redis plugin, but the plugin object cache didnt improve it
     
  10. Mar 26, 2017 #10
    eva2000

    eva2000 Administrator Staff Member

    58,893
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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    yeah my fix for hptweaks.sh is same result of what you did manually to disable transparent huge pages so you should be good after redis restart on non-openvz systems
     
  11. Mar 26, 2017 #11
    ahmed

    ahmed Active Member

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    luckily google cloud are on KVM :)
     
  12. Mar 26, 2017 #12
    ahmed

    ahmed Active Member

    404
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    Feb 21, 2017
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  13. Mar 26, 2017 #13
    eva2000

    eva2000 Administrator Staff Member

    58,893
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    May 24, 2014
    Brisbane, Australia
    Ratings:
    +19,122
    Local Time:
    12:12 PM
    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    123.09beta01 centmin.sh menu option 22 no longer auto installs redis object wp plugin due to too long caching of changed wp admin settings. Did you install the plugin yourself ?

    is redis server running ?
     
  14. Mar 26, 2017 #14
    ahmed

    ahmed Active Member

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    Yes I installed the "REDIS object cach myself"

    and added this to the wp-config

    Code:
    define('WP_CACHE_KEY_SALT', md5( DB_NAME . $table_prefix . FILE ) );
define('WP_REDIS_MAXTTL', 28800);
define('WP_REDIS_DATABASE', 7);
     
  15. Mar 26, 2017 #15
    eva2000

    eva2000 Administrator Staff Member

    58,893
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    113
    May 24, 2014
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    Ratings:
    +19,122
    Local Time:
    12:12 PM
    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    Just remove redis object cache plugin, not needed really it causes issues when you change admin settings it caches too long until you do a php restart. Haven't seen it slow down wp admin backend though.
     
  16. Mar 26, 2017 #16
    ahmed

    ahmed Active Member

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    so no advantage of object caching at all on wordpress from your experience?
     
  17. Mar 26, 2017 #17
    eva2000

    eva2000 Administrator Staff Member

    58,893
    12,490
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +19,122
    Local Time:
    12:12 PM
    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    there is for large traffic sites but - you'd end up having to restart php after each wp admin backend settings change you make or after saving a settings change.
     
  18. Mar 10, 2018 #18
    rc112

    rc112 Member

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    Hi @eva2000 Is it really unnecessary to install Redis cache plugin? I saw the tutorial. Is it possible to install other plugins which may achieve object caching? I found one here. Thank you so much.
    GitHub - pressjitsu/pj-page-cache-red: Redis-backed full page caching plugin for WordPress
     
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