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-   -   Pls Help on Datastore cache (https://vborg.vbsupport.ru/showthread.php?t=138708)

rastler 02-07-2007 11:54 AM
Pls Help on Datastore cache
 
Hi,

When I went through Datastore class in vb 3.5, I found that their are 3 ways of caching

1)using Filecache
2)Using Memcache
3)Using Eaccelerator

Currently I am using Eaccelerator only for caching php scripts and filecaching. When we install eAccelarator it caches all PHP scripts accessed., What is the use of vb_eaccelarator extended class in VB ?

In includes/config.php, Under caching configuration we have Array variables settings for

filecache , memcache but not for eaccelarator , why ?

can I use eAccelarator for both caching scripts as well as datastore of VB?

or is it better to use this way

caching scripts - >Eaccelarator
Datastore - > Filecache and Memcache

It would be helpful for me for any inputs

Thanks
Rastler

Marco van Herwaarden 02-08-2007 07:19 AM
If i remember correct, using eAccelerator for datastore caching is disabled in vBulletin as eAccelerator seem to be buggy with caching dynamic data.

See includes/class_datastore.php:
PHP Code:
// #############################################################################
// eAccelerator

class vB_Datastore_eAccelerator extends vB_Datastore
{
    /*
    Unfortunately, due to a design issue with eAccelerator
    we must disable this module at this time.

    The reason for this is that eAccelerator does not distinguish
    between memory allocated for cached scripts and memory allocated
    as shared memory storage.

    Therefore, the possibility exists for the administrator to turn
    off the board, which would then instruct eAccelerator to update
    its cache of the datastore. However, if the memory allocated is
    insufficient to store the new version of the datastore due to
    being filled with cached scripts, this will not be performed
    successfully, resulting in the OLD version of the datastore
    remaining, with the net result that the board does NOT turn off
    until the web server is restarted (which refreshes the shared
    memory)

    This problem affects anything read from the datastore, including
    the forumcache, the options cache, the usergroup cache, smilies,
    bbcodes, post icons...

    As a result we have no alternative but to totally disable the
    eAccelerator datastore module at this time. If at some point in
    the future this design issue is resolved, we will re-enable it.

    We still recommend running eAccelerator with PHP due to the huge
    performance benefits, but at this time it is not viable to use
    it for datastore cacheing. - Kier
    */
} 

rastler 02-09-2007 10:12 AM
Hi, Thanks for the info...

If I enable what could be the problem, I didn't get this sentence properly...
In the comment...
"Therefore, the possibility exists for the administrator to turn
off the board, which would then instruct eAccelerator to update
its cache of the datastore."

So eAccelarator is better only for opcode caching , So it would be better use Memcache for with caching dynamic data ?

Zia 03-03-2007 06:07 AM
try with Xcache. As a opcode cacher its doing good &
data store cacher
https://vborg.vbsupport.ru/showthread.php?t=141005


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