ats_pagespeed: Automatic WPO plugin powered by Google PageSpeed Optimization
ats_pagespeed provides automatic web performance optimization, powered by Google PageSpeed.
The plugin was build by We-Amp for its online demonstration service of PageSpeed optimization for Microsoft IIS: IISpeed.
Google PageSpeed Optimization speeds up your website by implementing web performance best practices.
A few of its features:
- Prioritize visible content above the fold
- Optimize images (inlining, rescaling/recompression, webp transcoding and more)
- Sprite css images
- HTML minification
- Lazyload and inline images
- A complete list of features resides here
Our intent is to donate the port to the ASF and if possible merge with LinkedIn's work on ats_pagespeed
Another improvement would be to migrate it to LinkedIn's C++ API's, as that would improve things
from a maintenance perspective.
The current state compiles against mod_pagspeed svn revision 3537.
Please note the this plugin will generate asserts when build against the debug version of mps (option->Merge from a different thread).
The plugin should be considered a work-in-progress. Currently it perfectly fits our first use case, but to be able to use this
as a generic addition for a CDN or accelerator, some things need to be improved.
That primarily concerns configuration, and possible the introduction of multiple ServerContext's to be able to
balance resources for multiple hosts properly.
There's also a few nice opportunities:
- Create native statistics for the port by re-using ATS's statistics capabillities
- Create a native async cache by integrating tightly with ATS's wonderful caching infrastructure
- Create a native async fetcher by wrapping ATS's fetching capabilities. This would probably be a real big win
and also make this the first port which supports keepalive for fetching content.
This plugin is known to be working on ubuntu 12.x (x64)
There are some hard-coded things in the plugin, so it expects:
- /tmp/ps_log/ to exist
- /tmp/ats_ps/ to exist
Configuration files go into
/usr/local/etc/trafficserver/psol. That folder is monitored, and changes to files in there are picked up immediately.
A sample configuration (/usr/local/etc/trafficserver/psol/foo.config):
# [host] [192.168.185.185]# Force traffic server to cache all origin responses
pagespeed RewriteLevel CoreFilters
pagespeed EnableFilters rewrite_domains,trim_urls pagespeed
MapRewriteDomain http://192.168.185.185 http://www.foo.com
pagespeed MapOriginDomain http://192.168.185.185 http://www.foo.com
pagespeed EnableFilters prioritize_critical_css,move_css_to_head,move_css_above_scripts
pagespeed EnableFilters fallback_rewrite_css_urls,insert_img_dimensions,lazyload_images,local_storage_cache
The plugin also expects this in records.config from ATS to function:
CONFIG proxy.config.url_remap.pristine_host_hdr INT 0You can view debug output of the plugin using
traffic_server -T ".*speed.*"