You have to enable the cache in wp-config.php for it to be created.
It is currently disabled by default as it was causing to many problems to support on every hosting configuration.
Add the following to wp-config.php
And then it should be enabled.
You can check its working with my cache inspector plugin – http://blog.ftwr.co.uk/wordpress/wp-cache-inspect/
I wouldn’t enable the cache with WordPress 2.0.2 … you open yourself up to one of the security vulnerabilities that 2.0.3 addresses.
Very true Mark! I forgot to recommend that above.
The instructions will of course work for 2.0.3 just as well.
Ok, I’ve enabled the cache in wp-config.php
No change – cache directory stays empty.
I installed your plugin westi, but I don’t see:
a small semi-transparent box in the top right hand corner of the page
I do now have a page at Manage > Cache, but the only content is a button to ‘Clear the Cache’.
I understand about the security issue, but need to troubleshoot first.
Correction to my comment above – I do now see the semi-transparent box on each page.
Cold Cache Hits stays at: 2
Warm Cache Hits increases by about 4-5 each page load.
Cache Misses: mostly stays at 15, occasionally drops to 13-14.
Loaded data: 12 pages (what I would expect).
However, /wp-content/cache/ remains empty.
If the cache folder is staying empty then WordPress can’t write to it.
There will still be some cache hits as the cache will be used ,within a single page load, instead of requesting the same info multiple times from the database
then WordPress can’t write to it
Any clue about what might be stopping it?
I’ve done a second WP installation on the same server, and this also will not write to cache, even with the instruction in wp-config.php.
Also, I’m puzzled your first reply:
It is currently disabled by default
I have WP 2.0.2 running on several other hosts, and the cache started working straight out of the box – no modification needed to wp-config.php.
I am beginning to think I might have an unsuitable host (I’m already on their case about intermittent timeouts when loading pages), but I would like to be certain that I have eliminated any possibility of mistakes at my end.
should be sticky… many people don’t read this..
they think everything works without adding the code..
I know about WP-Cache. Unfortunately it seems to require SSH or Telnet access to the webserver (although the author is strangely reluctant to answer questions about this).
I trying to find out if there is something wrong with the shared hosting server I am using that causes the ordinary WP cache to fail.
If it is a server configuration that can be corrected I will ask the webmaster to do so.
If it can’t be corrected, I need to know what I should be checking for when evaluating a replacement host.
Unfortunately it seems to require SSH or Telnet access to the webserver
Strange. Shouldn’t. What specifically are you trying to do while SSHing in?
What specifically are you trying to do while SSHing in?
Like most WP users, I only have FTP access to my server. Ricardo’s instructions start:
Step 1. Upload to your plugins folder, usually wp-content/plugins/ and unzip the file
I can’t find any information on how to do this. Every other plugin I unzip on my hard drive then upload, but this does not produce the necessary result:
it will create a wp-content/plugins/wp-cache/ directory.
Then the instructions say:
Step 5. Create a symbolic link from wp-content/advanced-cache.php to wp-content/plugins/wp-cache/wp-cache-phase1.php.
Reading down past lots of unanswered questions about this I finally see comment 351:
Clueless, what you need to do is login using SSH (or Telnet) to your server with a user that has the rights to make symbolic links.
If you are able to explain how an ordinary WP user on a shared host can achieve this it would probably be more appropriate on the plugin page I’ve linked to.
I appreciate your help, and the information on how to install the WP-Cache plugin will be very useful to lots of people who can’t get an understandable answer from the author.
However, I’d still like to know why the webserver I am on is not behaving and if it can be fixed.
just try to upload it like every other plugin.
- Unzip it on your hard drive, upload the whole unzipped wp-cache folder into wp-content/plugins/)
- Then go to the administration panel and activate it.
- After that, you’ll see a submenu called WP-Cache in the Options menu.
- If you click on this the first time, the plugin will try to create the symbolic link for you, so you don’t need SSH or Telnet.
- If something fails due the lack of writing permissions, the plugin will tell you what you have to do.
If you need to change file or folder permissions, have a look at Changing File Permissions at the WordPress Codex.
Thanks for the simple explanation, Arne.
The installation went fine – no error messages – no apparent problems.
WP-Cache is now Enabled with default configuration.
Cache contents reported as:
0 cached pages
0 expired pages
And no extra code appears in pages to indicate cache is working.
If I try to look in wp-content/cache with my FTP programme to see if anything is there, I get:
550 permission denied
I cannot change permissions on
wp-content/cache (currently: rwx — —)
or wp-content/advanced-cache.php (currently: rw- r– r–)
because user is ‘apache’, not me.
typically the ftp user is owner of files on ‘good’ systems. even on ‘bad’ systems, the ftp user should have full owner-level control over anything created in your tree by the apache user (if not, must be a permissions issue — mask, group, something… talk to your sysadmins).
don’t bother using the ‘object cache’ of WP2 on any standard shared server — it basically makes no impact. The only time it’d make some impact is when you have a very heavily hit SQL server and lightly hit webserver…
wp-cache is the plugin of choice. sounds like it got installed properly, but you may need to delete the /cache directory (or, again, talk to sysadmins — sounds like something odd on your box there!).
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