Board Optimization - datastore cache to XCache - boost your vBulletin

中文用户讨论@vbulletin-china.cn

(note: do not apply this patch on vBulletin 3.7 as it's included already)
This patch allow you to use XCache as a datastore cache in vBulletin. This is definitely your choice if you have installed and enabled XCache on you server already.

Take care that this is a beta version and was not heavily tested. And i'm not familiar with vBulletin source code as i just started reading it today, but i don't have any difficulty reading it thanks to my years of php skill

Take aware that some vB plugin is not compatible with vB_datastore_*, not just vB_datastore_XCache. So, in case you find vB_datastore_XCache won't work, you'd better try datastore to file or memcache. If one of the others works but not vB_datastore_XCache, do report it to me so i can fix it.

Pre-requirement

• a working php installtion
• a working vBulletin 3.6.5 installtion
• a working XCache installtion
• set "xcache.var_size = 10M" or so in php ini

Install the modification
for those of you who can't run "patch", u may patch the file manually

• download Attachment 61372 (class_datastore_xcache.php)
• save the file as vBulletin.3.6/upload/includes/class_datastore_xcache.php
• open vBulletin.3.6/upload/includes/class_datastore.php in your favor editor
• add a line in class_datastore.php (see below)
• update upload/includes/config.php to enable it (see below)

example class_datastore.php after modification:

PHP Code:

        }
        return true;
    }
}

// add class_datastore_xcache, enable it in config.php
require_once(DIR . '/includes/class_datastore_xcache.php');

/*======================================================================*\
|| ####################################################################
|| # Downloaded: 12:33, Fri Mar 2nd 2007
|| # CVS: $RCSfile$ - $Revision: 15474 $
|| ####################################################################
\*======================================================================*/ 


example config.php after modification:

PHP Code:


    // vB_Datastore_Filecache  - for using a cache file
// $config['Datastore']['class'] = 'vB_Datastore_Filecache';
$config['Datastore']['class'] = 'vB_Datastore_XCache';
    // vB_Datastore_Memcached - for using a Memcache server
    // It is also necessary to specify the hostname or IP address and the port the server is listening on 


Trouble Shooting
q. i have multiple vBulletin instance installed, the seems to mix data after install this plugin
a. this applies to apc too because, if you wanna fix it, try
open class_core.php, look for:
$this->prefix =& $this->registry->config['Datastore']['prefix'];
and modify to:
$this->prefix = $this->registry->config['Datastore']['prefix'] . $_SERVER['SERVER_NAME']; // or HTTP_HOST

q. Warning: unserialize() expects parameter 1 to be string, array given in $a.php on line $b
a. upgrade your plugin/hack that $a.php belongs to, e.g. vbjournal/vbgallery etc. OR open $a.php and locate at line $b, remove unserialize call, e.g.:
replace $var = unserialize($this->data);
with $var = $this->data;
be careful do not remove the whole line, just the unseralize( and )

[Icy]

Have you installed XCache as PHP extension? Would you please post your php.ini?

[Amenadiel]

yes, XCach? is running and I have 8 threads of php cached, but no cached vars.

[IrPr]

Hi moo
such a nice work! my huge forum is on the fly with lighty n xcache

Opcode cache works like a charm, Variable cache is workin too but there is sth wrong with this class to me
it kills my forum when i swich datastore to this class! server load increases upto 12 then will changes frequency up and down
Im using XCache for Template Cache module without such problem! template vars are cached and they'r fetching as charm
but for datastore it s*x! sth wrong when cachin or probably fetchin

here is my xcache admin interface snaps which indicates what i wrote
Attachment 76647
and here is my xcache configuration using 8 splits due to SMP CPU ( Clovertown Quad Core )

[xcache]
xcache.shm_scheme =        "mmap"
xcache.size  =                32M
xcache.count =                 8
xcache.slots =                16K
xcache.ttl   =                 0
xcache.gc_interval =           0

xcache.var_size  =            32M
xcache.var_count =             8
xcache.var_slots =            16K
xcache.var_ttl   =             0
xcache.var_maxttl   =          0
xcache.var_gc_interval =     300

xcache.test =                Off
xcache.readonly_protection = Off
xcache.mmap_path =    "/dev/zero"

xcache.coredump_directory =   "/tmp/phpcore/"
xcache.cacher =               On
xcache.stat   =               On
xcache.optimizer =           Off

[xcache.coverager]
xcache.coverager =          Off
xcache.coveragedump_directory = ""

PS: i loaded xcache.so with zend extension, not default extensions directive

Please help me guys, any suggestion is welcome!

Regards

[IrPr]

Originally Posted by Amenadiel

yes, XCach? is running and I have 8 threads of php cached, but no cached vars.

Seems config.php issue to me
make sure that ur config.php is clean by one $config['Datastore']['class'] assigned by 'vB_Datastore_XCache' and not commented out!

[IrPr]

Originally Posted by doraj

If I use XCache Datastore, Can I also active "GZip Compression" to my AdminPC or are possible conflicts?

Thanks..

Ofcourse You can, theres no relationship between PHP Output handlers (GZIP or Deflate) and PHP Opcoder/Variable cachers ( XCache or APC or eAccelerator )

[Amenadiel]

Ok I solved the mistery. I spoke to the machine admin (I run the forum but I avoid messing with server configuration for I am no linux expert) and he told me that he compiled xcache without var cache support. He thought it wasn't necessary.

We will recompile in a few days. I'll update you guys then.

[Icy]

IrPr! You should increase the memory for op code cache. OOMs (out of memory) is no good. Try using 64 MB & see if there are any OOMs.

[IrPr]

Originally Posted by Icy

IrPr! You should increase the memory for op code cache. OOMs (out of memory) is no good. Try using 64 MB & see if there are any OOMs.

Thanks Icy, i will increase
but what about Datastore class issue? i mean Variable cache
any idea?

BTW is there any other modification which conflicts with?

[Icy]

What PHP version are your using? If PHP 5.2.5 then check this link & downgrade to PHP 5.2.4.

[IrPr]

Originally Posted by Icy

What PHP version are your using? If PHP 5.2.5 then check this link & downgrade to PHP 5.2.4.

I did but still same problem
i get no segment error but server load still increases
here is my phpinfo()
MOo please help