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WP Super Cache
Blank page in Front and Admin (7 posts)

  1. dotMastaz
    Member
    Posted 1 year ago #

    Hello,

    I have a dedicated server and i install wordpress + wp super cache.
    Often, wp super cache generated blank page in front and admin.
    If i restart apache, all is ok, but 5' after, blank page again ?

    On my apache server, i installed memcached mib,...

    An idea ?

    http://wordpress.org/extend/plugins/wp-super-cache/

  2. dotMastaz
    Member
    Posted 1 year ago #

    Compatibility problem avec opc, memcache,...?

  3. Mike Bijon
    Member
    Posted 1 year ago #

    Are you running your site on apache or nginx? If it's on nginx, did you setup a reverse proxy or other type of cache?

    Also, what is your super-cache expiration time? It's possible the permissions on the cache storage allow reading and writing, but not deletion. That could cause corruption, http://stackoverflow.com/questions/869536/linux-directory-permissions-read-write-but-not-delete

  4. dotMastaz
    Member
    Posted 1 year ago #

    Hello,

    Running on Apache,
    Expiration :
    - Cache Timeout : 1800 seconds
    - Scheduler is set to Clock at 00:00

    Permission is set to 755 (drwxr-xr-x) for the 'cache' folder in wp-content

  5. Mike Bijon
    Member
    Posted 1 year ago #

    Those shouldn't be causing the problem after 5min then. Couple of things to try:

    1.) There is one thing in Super Cache locked to 5min, it's the "Check front page every 5 minutes" on the plugin debug tab (wp-admin/options-general.php?page=wpsupercache&tab=debug). Do you have that enabled?

    If it is enabled can you disable it, then see if the problem still happens?

    2.) While you're on the Debug tab, you may as well enable the Debugging log (** for your own IP only) and then post those messages here if the problem is still happening.

    3.) You only mentioned memcached, but do you also have APC, eAccelerator or similar opcode caches installed?

  6. dotMastaz
    Member
    Posted 1 year ago #

    Hello Mike, and thank for support !

    When i say 5', it's just for give a time, it's could happen in 10 seconds ;-)

    1) I look !

    2) I'll test

    3) Yes, there is APC !

    thank you again !

  7. Mike Bijon
    Member
    Posted 1 year ago #

    If you can check the Debug tab and post results here it might help me think of more.

    With what I know so far, I think you should disable APC and then test more. This post suggests Super Cache + APC can have errors due to specific character encodings: http://askubuntu.com/questions/141734/incompatibility-between-wp-super-cache-and-php-apc

    It's possible that you have a character that breaks the cache in just one post. Then your server only locks-up when that post is viewed and added or retrieved from the cache.

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