Redis Coding issue with redis at nginx level caching

This would be the case for any sort of caching that attempts to bypass php in favour of pageload speeds.

In a recent test, i found that cache enabler outperformed redis front page caching. This is especially true on php7. On php 5.6 redis cache peforms better.

For mobile views if you have a subdomain for mobile views or cache that creates a cached html version for mobile maybe can explore using http_user_agent to redirect at the nginx level.

if ($http_user_agent "(device|device)" {
Rewrite ^ $url;
}

 

This is before mounting the cache directory to tmpfs. If you use autoptimize or other js/css minifying and combining plugins that also saves file to cache , i would expect performance increase as well when mounting the /wp-content/cache directory to tmpfs.

Also redis cache is configured as per centminmod defaults/recommendation including redis object cache and front page caching. No redis or memcached object cache for the cache enabler plugin so lots of room for improvement.

As you can see at 100 concurrent connections difference is marginal. At 200 there is a more obvious difference. Looking at the pattern, the difference will be greater the more number of concurrent connections.

 

WordPress Cache Enabler Plugin - KeyCDN Support

Cache enabler with appropriate nginx configuration is also able to route subsequent hits to static files once the cache has been generated. Fortunately, centminmod set up with menu #22 also has appropriately set up nginx vhost configurations for webmasters who wish to use cache enabler. It is very nicely commented out

Code:

  # for wordpress super cache plugin
  #try_files /wp-content/cache/supercache/$http_host/$cache_uri/index.html $uri $uri/ /index.php?q=$uri&$args;

  # for wp cache enabler plugin
  try_files $cache_enabler_uri $uri $uri/ $custom_subdir/index.php?$args; 

  # Wordpress Permalinks
  #try_files $uri $uri/ /index.php?q=$uri&$args;

  # Nginx level redis Wordpress
  # https://community.centminmod.com/posts/18828/
  #try_files $uri $uri/ /index.php?$args;

It would look for the html cached page, and only pass it to php if it does not exist.

Code:

    # default html file
    set $cache_enabler_uri '${custom_subdir}/wp-content/cache/cache-enabler/${http_host}${cache_uri}index.html';

    # webp html file
    if ($http_accept ~* "image/webp") {
        set $cache_enabler_uri '${custom_subdir}/wp-content/cache/cache-enabler/${http_host}${cache_uri}index-webp.html';

"Best" is often subjective as there are too many variables and normally it depends on each individual site the solution to adopt.

I switched over to Cache Enabler because most of my sites are WooCommerce and I found that it plays better with a native wordpress cache plugin. Also cache enabler is the only cache plugin that allows creating separate cache for webp images (which I found to reduce the page payload significantly - images are often the cause of slow page loading speeds). I pair it with EWWW image optimizer since cache enabler added support for it a month or so ago, you do not need to use the premium Optimus plugin to take advantage of webp images.

Perhaps you could set up 2 staging links and compare it side by side and share your findings? Might need to use separate php-fpm pools as I run into an issue having both on the same one.

 

Interesting. Why not allow mobile to have a separate cache key?

 

Good point. Guess the way forward is either to have another theme for mobile or to have media query based responsive themes (just makes it look nice on mobile - doesnt actually has smaller file size )

 

I have this config for several months now, using WP Super Cache and separate cache files for mobile visitors.

PHP:

#### Mobile Detect
    set $mobile_rewrite index.html;
    if ($http_user_agent ~* "(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino") {
    set $mobile_rewrite index-mobile.html;
    }
    #### Mobile Detect

    location / {
     try_files /wp-content/cache/supercache/$http_host/$cache_uri/$mobile_rewrite $uri $uri/ /index.php?$args;
    }

 

I think the owner of the site use "Jetpack's Mobile Theme Module".

 

I spent a bit of time with Saumya few days back and I think he decided that redis cache was for him - granted he didn't have a server to siege with so I did it from my VPS - which I personally felt was not ideal due to geographical latency fluctuations.

For my particular setup I ran again on a blogpost with 2 images, one jpg and one webp, this time with webp on redis full cache too, as well as Better Wordpress Minify (I prefer this over autoptimize due to its using wp enqueue way of concatenation, and able to easily exclude scripts from the wp-admin without tearing my eye viewing source).

Code:

Date & Time,  Trans,  Elap Time,  Data Trans,  Resp Time,  Trans Rate,  Throughput,  Concurrent,    OKAY,   Failed
**** BWP Minify + Redis FP Cache + Redis Object Cache ****
2016-08-26 00:24:35,  26000,     426.02,        2888,       1.61,       61.03,        6.78,       98.52,   26000,       0

**** BWP Minify + Redis FP Cache + Redis Object Cache + Webp image format ****
2016-08-26 01:23:54,  21997,     365.22,        2821,       1.64,       60.23,        7.72,       98.80,   21997,       3

**** BWP Minify + Cache Enabler (On TMPFS) + Redis Object Cache + Webp image format ****
2016-08-26 02:16:29,  25998,     364.00,        2872,       1.38,       71.42,        7.89,       98.65,   25998,       2

Actually, until redis sockets are supported for nginx helper, at this point performance difference is minimal. Testing and testing again, I cannot reiterate that the biggest performance gain is from tweaking the wordpress theme itself.

Plugin Organizer — WordPress Plugins

Above plugin (free) should be useful for many who are into theme optimization.

Speed up WordPress | Gonzales WordPress plugin

Another premium paid plugin that is more dummy-proof and integrates nicely into admin bar.

 

Yea it is quite useful especially in backend. Many people often do not exclude the correct scripts and css when using Autoptimize, this causes subsequent page visits for first time visitors to be slow because you need to download another huge concatenated css/js that is not the same as the one on homepage. If exclusion is done correctly, only need to download the 'extra css/js' files that are much smaller, and fat concatenated css/js is served from browser cache.

I think with HTTP2 parallelisation, the enqueue way of BWP minify seems to be easier to use and works better perf wise.