It’s time to lift the veil of secrecy on my latest project. With help from friends who diligently tested and reported bugs on this I can now present version 0.1 of WP Super Cache!
It is an extensive modification of the famous WP-Cache 2 plugin by Ricardo Galli Granada. This plugin creates static html files that are served directly by the webserver as well as the usual WP-Cache data files. It also goes one step further fixing a couple of bugs, adding some hooks and new features and making WP-Cache more flexible.
From the plugin page, here are some of the major changes and updates:
- A plugin and hooks system. A common complaint with WP Cache was that hacking was required to make it work nicely with other plugins. Now you can take advantage of the simple plugin system built in to change how or when pages are cached. Use
do_cacheaction()andadd_cacheaction()like you would with WordPress hooks. Plugins can add their own options to the admin page too. - Works well with WordPress MU in VHOST or non-VHOST configuration. Each blog’s cache files are identified to improve performance.
- Normal WP-Cache files are now split in two. Meta files go in their own directory making it much faster to scan and update the cache.
- Includes this WP-Cache and protected posts fix.
- Automatically disable gzip compression in WordPress instead of dying.
- As Akismet and other spam fighting tools have improved, the cache will only be invalidated if a comment is definitely not spam.
If your server is struggling to cope with the traffic your site gets this plugin could be just right for you. If your site regularly gets hit by spikes of traffic like a digging or slashdotting it’s definitely the right choice, and even for everyday use, you may very well notice your webserver is a little bit more responsive.
I contacted Ricardo last week and sent him on an earlier copy of the plugin but I haven’t heard from him yet however. I’d love to know what he thinks of my modifications!
Update! this post has been dugg, please digg it and we can really test the cache out!
Nov 6th: WP Super Cache 0.2 is out! I think all the bugs mentioned below are now fixed. I applied Tummbler’s patch (from Elliott and Reiner) that enables gzip compression of the WP-Cache data files and fixes feed content types.
Please note: PHP’s internal zlib compression must be disabled for this to work. Look in your php.ini for the zlib.output_compression and zlib.output_compression_level directives and comment them out by placing a “;” at the start of each line.
Check the plugin page above for the download link.
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Very nice. Will try it out soon.
I’m getting the following message on the options page:
“Install is not complete. Please delete wp-content/advanced-cache.php”
But when I delete the file, my site blows up until I restore it.
What am I doing wrong?
The super cache plugin managed to increase my load.
You should read the how it works section… Super Caches are only created when people who aren’t logged in view a page from what I can understand.
By the way I was wondering, a caveat is that someone who is if you’re logged in or write a comment, but what do you mean by this? Do you mean that you won’t use the benefits of Super Cache? Or does it mean that if you post a comment it won’t update and will appear as if it wasn’t posted until the cache expires?
sorry for the constant posting. i view the site not logged in and view the source and i see this.
in the wp-super-cache admin screen i see this.
WP-Cache
* 497 cached pages
* 44 expired pages
WP-Super-Cache
* 1219 cached pages
* 0 expired pages. (Generated 22 minutes ago. Refresh in 38 minutes.)
so obviously super cache pages are being created, but i am not seeing any of them served.
http://www.everydayshouldbesaturday.com
can someone verify if they see the super cache pages being served?
@donnie
I was under the impression that you weren’t supposed to have WP-Super-Cache and Super-Cache active at the same time? (Step 2 of the installation instructions in the readme.txt file)
sorry, I meant WP-Super-Cache and WP-Cache active at the same time
@donnie
ugh, apologies – I’m totally off-track
as for my own problem, it seems to be fixed. Fiddling with the permissions on advanced-cache.php seems to have fixed it
Donncha, this is a fantastic plugin! I just implemented it on the WebGeek Blog and it rocks…blazing fast. Excellent work!!
Thanks, Donncha
Symlinks shouldn’t be a problem, w/ WP-Cache I took care of them by either copying the file directly or by creating a hard link to the target.
WP-Cache had some weird problem (that shouldn’t have occured) that I wasn’t able to pin down when creating the .meta files for posts so that it ended up “caching” the page each time it was viewed. It worked just fine for index pages and feeds though.
I’ll give this a shot and let you know how it goes
Looks great and I’m considering replacing WP-Cache with this on my site — http://www.finalgear.com/
We don’t have load issues or anything due to an uber box, but it’d still be nice to optimize further to keep more CPU available.
However, I have a question: The point of this plugin is to go completely static, right? I ask as I have a part of the site that’s currently dynamic and generated via a little databaseless PHP.
One more comment. Just got everything running. For the most part, it’s awesome. The only thing causing a bit of trouble is the Rejected URIs part of the config page. No matter what I enter, it still caches every page, even if they contain one of the listed strings. (I did save them so I know it’s not that.) IT creates a problem only because I have several tools pages that need to update via PHP each time it loads. Any thoughts on why that might not be working and how to fix?
Will this work on older versions of WP? I’m still using the 2.0.X flavor.
I’m having the same problem with Rejected URIs as WebGeek. It looks like everything is getting cached and super-cached whether they are in the exclusion list or not.
maybe its not updated because the version tag in wp-cache.php is not changed?
thanks for the update (0.3)
Sara – that occurred to me this morning. I’ll have it fixed shortly
Fantastic plugin Donncha. Page load time here is amazing considering front page digg. Installing on a few blogs already and is working a charm. A shiny penny for you.
good
mh.. maybe it should check if apc cache or eaccelerator is installed and use it for caching? and if both are not installed on the sys, just go ahead like usuall wp-cache/super-cache?
just a stupid idea..sorry.. and i dont know if it would improve caching using apc or eaccelerator functions..
have a nice day
nice work Donncha! how does the plugin cope with WP’s integrated object caching?
Thanks so much ! It is a truly Super plugin and has sped up Storynory no end.
how does this determine whether or not you have made a comment? is it only per post or if you make 1 comment then you get regular cache the rest of the time? i understand if you are logged in … so i used a different browser and made sure i wasn’t logged in but still get the regular cache, nothing from super cache. maybe it’s something with the .htaccess since i am not using the fancy permalinks.
http://www.everydayshouldbesaturday.com
can anyone see the super cache pages?
RE my earlier question:
I went ahead and moved a dynamic PHP header to a JS image picker and switched the leftover PHP dynamic stuff being called via AJAX. So the page won’t be completely PHP free, but I think WP Super Cache + a little AJAX is better than WP-Cache’s silly includes.
That wouldn’t work as you’d have to load up PHP to fetch the files from the cache engine, at least from my understanding. Defeats the purpose of this plugin.
However, you can tell your cache engine to cache the “cache” folder to RAM and serve it up from there rather than your hard drive. I’ve done that on my site with WP-Cache for quite a while.
Viper: Your operating system should, in any case, cache frequently-used files itself.
Viper – I wonder if we’ll see the rise of Javascript widgets again if this plugin becomes more popular?
donnie – WordPress has a “hook” that is executed each time a comment is left. That hook clears the cached file for the post the comment was left on, and also clears the main page’s cached file too, just so widgets get a chance to refresh and fix comment counts.
I only see WP-Cached pages, no the “super cache” string in your footer. Check your wp-cache-config.php, your .htaccess and finally your cache directory!
tomás – WP’s internal caching is a whole different beast. It’s completely separate. They don’t interfere with each other at all.
Sara – using memcached to store the cache isn’t such a bad idea. I know a certain *large* WordPress site that does that, but they have dedicated 4GB memory servers for that task!
Lincoln – it should work, I hope. Give it a go!
Michael Feldstein – make sure the advanced-cache.php link points at the wp-cache-phase1.php in the wp-super-cache folder, not the wp-cache folder!
Jorge Peña – if you’re logged in or leave a comment, you’ll always see WP-Cache generated content. If you delete the WP cookies you’ll see the static content again!
Dougal – yes, must fix that. Also the list doesn’t reflect what’s stored in the super cache.
sylv3rblade – look at plugins/searchengine.php for an example plugin that uses those actions.
I installed a “paged comments” plugin but it’s annoying. I like that the newest comments are on the front page, but I’d prefer if they were in descending order. Hopefully that can be done. I need to look at the config file again.
i didn’t think i needed to edit/rename the wp-cache-config-sample.php file … i just made the settings in the admin area.
Donncha: yeah, i know they’re a whole different story. but I remember there used to be problems between WP-Cache and WP’s object cache. just as there was a bug using WP-Cache together with APC… or even with some plugins, such as Democracy.
k, the config file was completely different, so i replaced it with the new one, made the changes. still no super cache pages. i did notice one thing i think should be changed if you are not using fancy permalinks … every where it says %{HTTP_HOST}/$1index i changed to %{HTTP_HOST}/$1/index because fancy permalinks contain a trailing slash where the default doesn’t.
Donncha, any word/thoughts on the Rejected URI’s not working? Thanks!
Not knowing how to do a symlink, I copied wp-cache-phase1.php to the appropriate folder and renamed it “advanced-cache.php”. However, when I open that file, I find that it’s empty. Sorry for the dumb question, but how do I get the file to “point” to wp-cache-phase1.php?
hi Donncha,
hm.. i know.. but using a little bit eac or xcache or apc cache together in one module / plugin would be really a big deal, or not?
try this paged comment plugin, its better in my opinion..
http://wp.uberdose.com/2007/08/19/ajah-comments/
please, let us know when the new version is out.;)
Alright, just released 0.3.1 and added a changelog: http://svn.wp-plugins.org/wp-super-cache/trunk/Changelog.txt
The main change in this release is using preg_match() to match rejected uris. You must change “wp-” to “wp-.*.php” or else it’ll start matching posts and pages with “wp-” in the URL again.
http://wordpress.org/extend/plugins/wp-super-cache/
Hey, great plugin, I tried running it on my site for a while and it really sped things up. Unfortunately I had to disable it because when I was working on the site I started to notice that whenever I would reload a page something would go wrong and i’d be served a blank page, upon refreshing that page I’d then get the correct page. Reload that -> blank page… so on and so forth. I tried disabling compression and it just turned that blank page into a 500, but still the 50/50 proper page / blank(500) page.
What’s weirder is that this only happened in Firefox and stopped happening once I disabled the plugin and uncommented the .htaccess mods.
Oh, this was in 0.3 and 0.3.1.
shoot me an e-mail if you need any more info.
Also, if you are server super cached pages, searching seems to be broken.
I am running Windows with IIS 6 and it seems that the caching is working, but the admin options page for wp-supercache is just a blank white page… no options at all. I have followed everything in the readme.txt file – anyone else have this?
Hi Donncha,
… when I saw that you mentioned everyone else in your post except , myself, in the people who have worked on WP-Cache .
I have to say that you … broke my heart
Just joking of course – that’s the beauty of open source , a lot of people make most of the hard (and exciting ) work first and all the credits go to those who ” pretty package” do the (boring) job of polishing things up to share them with the rest of the community…(I DO NOT mean you of course) Thanks for doing this service to the WP community!
You seem to have done a very interesting job (It’s a pitty I am currently involved in Semester exams and can’t take a more detailed look in it) so I will have to delay further / more technical comments
I am mostly interested to see how you have managed to implement gzipping of pages including parts that need to dynamically update each time the page is loaded , cant get it right now how the hooks are called from the gzipped file!
The dynamic content problem has been puzzling me for long and kept me from releasing a “Shrink wrapped / ready to install plugin” gzip enabled version .
I am very happy seeing that someone better than me has managed to tackle it!!
Best Regards,
Nick
It seems that there is a vulnerability in the plugin. Several people on twitter mentioned it (factoryjoe as the first) and I just deactivated and copied my cache over just to see that half my server was mirrored in the supercache folder. The vulnerability seems to be injection of .txt files as parameters which don’t get filtered out before the cached files get written!
Another issue that’s come up…some pages are being cached and so are the credentials for comments. Actually, the comment form says logged in as Administrator even if you open it from a different computer that has never loaded that page before. Looks like when it cached the page, I must have been the first one to view it while I was logged in and therefore it cached that.
Any way to fix it so that it does not cache the logged in version of a page?
Thanks
Darn, I was hoping this would fix my problem with WP-Cahce, but it doesn’t. I used Goddady shared hosting, and when I use this plugin (or WP-Cache) I get a 500 internal server error.
Donncha, I’ve sent you an email about making the code Windows-compatible, just a few minor changes; with a couple of non-Windows-related bug reports as well.
For people looking to run WordPress Super Cache on Windows in the here and now, here are the steps: http://neosmart.net/blog/2007/getting-wordpress-super-cache-to-run-on-a-windows-iis-or-apache-server/
Runs on both IIS and Apache on Windows.
I’ll be benchmarking it soon!!!
Great plugin! I have tried it and it looks like something I would definitely use. However, one thing I’ve noticed is that my ajax rating images will never be updated while the cache is generated. Is there a workaround for this? The rating plugin is called Wp-PostRatings
Thanks!
Chris and I are exchanging emails and trying to figure out where his server was exploited. The Super Cache plugin will cache the path of the exploit filename, but it stores the 404 message or whatever WordPress displays.
If anyone finds files from outside their webserver path or blog stored in the wp-content/cache/supercache/ folder then please contact me immediately at donncha at ocaoimh.ie
I don’t know how to create a symlink, is there any other way I can fix the error that says “advanced-cache.php link does not exist”?
The FAQ in the Readme says “copy the file”
What file should I copy to where?
John – copy plugins/wp-super-cache/wp-cache-phase1.php to wp-content/advanced-cache.php
I thought that was pretty clear from the rest of the sentence. I’ll try to make it clearer.
Great plugin!
I’d just like to reiterate what Deaf Musician said. DreamHost with compression = funny characters.
I copied ‘wp-cache-phase1.php’ to the ‘wp-content’ folder and renamed it advanced-cache.php, but I still get the error saying “advanced-cache.php link does not exist”
When one switches themes the cache is cleared using the ’switch_theme’ action but when the widgets on the sidebar are changed the cache isn’t being cleared. I could not find an action for that.
Elad – that’s bad! There must be an action we can hook into to clear that cache. I’ll take a look too.
John – That’s strange. Did you have WP-Cache installed before? The error shows up because the do_cacheaction() command wasn’t found in the advanced-cache.php file, which means the wp-cache-phase1.php was copied from the original WP-Cache.
Nick Georgakis – please accept my apologies for the oversight. I saw your name in a patch but because I was under a lot of pressure I didn’t look for your blog and then forgot to include your name in the Changelog. And no, when a file is cached as a static html file then there are no dynamic parts. The best thing to do for dynamic content is use Javascript like in the good ol’ days of sitemeter
I’ve never used WP-Cache. This is my first time installing any caching.
By the way, I’m using Wordpress 2.3.1 on Linux/Apache
The files I’m using are only from the Super Cache plugin download version 0.3.1
So have the possible php injection vulnerabilities been confirmed/fixed?
I was just getting ready to install this when I heard about the possible problems.
Any news?
JimmyJoe – I’m fairly confident it’s not a vulnerability, just a small bug that created the supercache directories in the wrong place.
I have a few questions about the WP Super Cache options page.
I see that there are separate options for WP-Cache and WP-Super-Cache, which pages get cached by WP-Cache and which pages get cached by WP-Super-Cache?
Good work on your plugin, thanks. I am also getting a problem where a previous commenter’s name is cached on a single post page. The preg-match doesn’t like forward slashes in the excluded strings box… i.e. when you use /2007/ as in the example above the box. Thanks!
RobotDan – are you using my friends adverts plugin? Or have you enabled that plugin the super cache admin page? The next release will have a fix for a minor bug that might cause what you’re seeing.
Donncha
No, the options page confirms that the adverts plugin is disabled.
Hey this is one of the most useful plugins I’ve come across! I just built a website for a large company that gets TONS of traffic and this saved the site from time outs and blank pages… just one question – will this effect pageviews from a statistics point of view? Someone I work with had told me he installed a cacheing plugin on his WP blog (not this one) and he said that the cached pages were not counted in his pageviews from his stats program? I just want to make sure that this isn’t the case for this plugin.
Lindsey – if you use a stats program that uses Javascript to count visits then you’ll be fine.
RobotDan – can you try and debug it and figure out a pattern? Leaving a comment should remove the previously cached page.
Hi there Donncha,
This is an exciting project for me! I really look forward to trying it out and hopefully getting more from my server.
Do cached pages require any database queries? I ask this because my hosting has a SQL server on a different machine, so database queries can be slow due to network congestion – even on simple selects. At the moment my page render times are about half a second on average – will your plugin cut this down?
Also, can you specify cache life? I’d set mine to about 6 hours or so maybe to reduce database activity to a bare minimum!
Thanks for all your hard work on the Wordpress platform!
CalonDdraig – sounds like the perfect fit for you. Static cached pages don’t make any db queries but when someone is logged in or left a comment then caching is handled by WP-Cache which means PHP is loaded. If a cached file is found then no, generally there are no db queries.
Thanks for that – it’s an absolute dream!
My page render time has gone from 0.7 seconds to
Donncha,
Is it possible to use the wordpress search using Super Cache? When I try to search on a Super Cached page I’m taken back to the index. When I’m logged in and search and the page is served with WP-Cache, it works.
Vic – if you try the development version of the plugin you should hopefully find that searches work again. They won’t be “super cached” but they will be cached by WP-Cache.
For wpmu I would also clear the cache when blog is marked as spam, archived or deleted.
for some reason, all of the pages stored in the super cache are now the index page. :/
i have noticed one thing. some characters are being altered in the super cache pages.
orig : altered
“ : “
” : â€
’ : ’
‘ : ‘
you can see it on this page: http://www.everydayshouldbesaturday.com/2007/11/09/degenerates-unite/
I did a new combo of plugins and the Result, the fastest possible performacne on wordpress – with Hyper Cache and DB cache Reloaded
http://www.taranfx.com/blog/best-fastest-alternative-to-wp-supercache-hypercache-db-cache-reloaded
Thanks for the good work. I was running WP-Cache fine with GZIP mod, but with Super Cache I get the “save the page” prompt in Firefox. How come GZIP works for me flawlessly with the mod WP-Cache but Super Cache makes Firefox prompt to save the page?
This shows the compression issue it’s not with the server configuration (again WP-Cache modded to serve GZIPed pages was working flawlessly), but with Super Cache.
Any ideas are very welcome, I really want to use Super Cache but need compression.
yeah, what he said… I had to disable the compression myself.
Finally got the thing up and working on my site and seems to be doing great. Thanks!
Hi!
Great plugin. I have a question. My web page is hosted by godaddy and there is a known problem with cache plugins and this host with the header “Last-Modified”
http://www.littleredrails.com/blog/2007/09/08/using-wp-cache-on-godaddy-500-error/
is there any solution to this?
Thanks!!
Really great Plugin! Are you still maintaining it? Does the 0.2 version work with the newest WP version?
Awesome plug in here thanks “”
Very useful plugin. Thank you.
Very useful plugin. Thank you very much
Hi Doncha,
Thanks for the great plugin.
I have a slightly off-topic question, but I saw your post about memcached on wordpress.org.
I using the object cache -> memcached replacement files from http://dev.wp-plugins.org/browser/memcached/trunk and I’m not sure how to set the memcached cache to expire. I’ve tried adding an expiry in wp-config but that isn’t working.
Do you know how to reset the expiry time of the cache? I’ve got memcached working via a slave server but nothing I try works to expire the cache.
Thanks again!
elio – you set the cache time when you call wp_cache_set/add/update, otherwise the default is used. Can’t remember where that default is, but it’s an hour AFAIR.
Hi Donncha,
WP Super Cache is a great plugin, I use it since I set up my blog.
But I found cache the whole pages is not aways that necessary, so I write a new cache plugin WP Widget Cache, which can cache the output of blog widgets. I think it’s a plus for WP Super Cache, and will significantly reduce the cost for WP Super Cache to cache new pages, especially when Google is crawling the site.
Here’s the plugin url:
http://wordpress.org/extend/plugins/wp-widget-cache/
Looking forward to hear you thoughts.
Hi,
I have been kindly left (had dumped on me) a website which has started displaying an error “Parse error: parse error in /html/news/wp-content/plugins/akismet/.wp-cache.cache.php on line 1″. I am a software developer but I have no experience in PHP and I am unsure of where to start.
If you could provide any pointers as to what the problem might be that would be greatly appreciated.
Thanks in advance.
Declan – delete the file or move it out of the way, that shouldn’t be in the akismet directory. Your site may have been hacked. Look for the WordPress Exploit Scanner to do a scan.
Hi,
As a temporary measure I rename the akismet directory and the problem has gone away. I will investigate further as to security of site.
Thanks for your help.
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L’unic…
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[...] this will save you hours of grief if your website decides to get all popular in a hurry. Check out WordPress Super Cache or WP-Cache 2.0 (for HawkHost customers please feel free to send us a ticket and we’ll help [...]
[...] have heard good things about the ‘super cache‘ plugin however, but really you want to display the most up-to-date information to every [...]
[...] WP-SuperCache es un nuevo plugin que viene a ser una versión corregida y aumentada del famosísimo plugin WP–Cache desarrollado por Ricardo Gali. Según el creador de WP Super Cache, ha corregido algunos errores que venían en el código del plugin original. [...]
[...] Hunt found a plugin that prevents that from happening. It’s called super-cache, and works by converting your wordpress site into a static site temporarily! Tags: wordpress [...]
[...] やっぱりページの表示速度はWordPressよりスタティックパブリッシングのMovableTypeの方が断然有利です。 しかし、WP-Super Cacheを使ってページのキャッシュを生成してやればページの表示速度はMT並に加速します。 ここで問題となってくるのが、「適切なキャッシュの期間は一体どのくらいなのか」という点です。 遅すぎれば最新の情報が見れないし、速すぎるともっさり動作だし・・・。 他にも何か対策出来る事は無いか研究中です。 [...]