[Solved] xCache Error

[sux0r]

When i switch xcache.mmap_path

From:
xcache.mmap_path: /dev/zero --> to anything other than this.
It fills the error log with -->

[66.249.71.187:40143-0#APVH_] [STDERR] PHP Warning: xcache_isset(): xcache.var_size is either 0 or too small to enable var data caching in /home/youth/public_html/forums/ips_kernel/classCacheXcache.php on line 95

Heres my php.ini bit about xCache.

 

[webizen]

Do you mean when you switch xcache.mmap_path to anything other than /dev/zero, you start seeing these errors? but no problem if use /dev/zero, correct?

 

[sux0r]

Yes, exactly

 

[webizen]

What other path did you change to that caused the warning? It is more of an xcache setup issue in stead of LSWS issue.

 

[sux0r]

Tried:
/dev/shm/
and
/tmp/xcache/

 

[NiteWave]

per xcache document: http://xcache.lighttpd.net/wiki/XcacheIni
"xcache.mmap_path is a file path, not directory"
but both the 2 examples you tried are directories.

 

[sux0r]

Tried /dev/shm/xcache

As well with no luck

 

[webizen]

is /dev/shm/xcache (file) writeable by the webserver running user (e.g. nobody)?

 

[sux0r]

I corrected the permissions.
And after tht im getting 503 errors.

It seems one of the scripts is taking up too much memory
The current memory_limit = 128M
Hw much do i need to increase this ?

~ Thanks

 

[NiteWave]

how much is current memory soft/hard limit of lsphp5?

Server->External App->lsphp5->
Memory Soft Limit (bytes)
Memory Hard Limit (bytes)

increase it to 700M/750M(for example) and try again

 

[sux0r]

Before it was set to the default values.
I've set it to 700/750 and still getting the 503's

 

[NiteWave]

how about disable xcache, if 503 error disappear?

 

[sux0r]

the error only pops up wen i change
xcache.mmap_path: /dev/zero --> to anything other than this.

Currently i checkd with /dev/shm/xcache

 

[NiteWave]

please set
xcache.readonly_protection = on
in php.ini

I installed xcache 1.3.1, no 503 error when
xcache.mmap_path = "/tmp/xcache"

however I only did tests on phpinfo(). your 503 error is random, right?

per my understanding, set xcache.mmap_path other than "/dev/zero", you must set
xcache.readonly_protection = on
as well.

please inform if 503 error disappear or still there after change above setting.

 

[sux0r]

Yes i tried as you've mentioned with no luck.
And yes the errors are random.

 

[NiteWave]

looks you run php in suExec mode, it's not a good idea to enable xcache/apc for it.

how many lsphp processes are running? can estimate it with "ps -e|grep lsphp5|wc"

each lsphp5 process will consume 70M+70M=140M xcache memory, and lsphp5 process will only run a short time once no more requests assigned to it.

if you really want to enable xcache, run php in non-suExec mode. (but for shared hosting, usually this is not an option for security reason). in this mode, the total memory consumed by xcache will be much less since it can be shared among lsphp5 processes, and may be no more 503 error.

 

[sux0r]

[root@sux0r ~]# ps -e|grep lsphp5|wc
7 28 217

I disabled suExec mode and alls working. :]
Thanks

 

[MattW]

Old thread I know, but this just helped me figure out why Xcache wouldn't start

 

[semprot]

Why did you try other than /dev/zero/ ?
When i tried /dev/shm/ , it gave me error too, so i use /dev/zero/ now.
Does changing it other than /dev/zero/ will give significant boost?

 

[skooboy]

I can't seem to get it to work with anything other than "dev/zero". Can someone write detailed step-by-step instructions on how to make it work with "/dev/shm/zero"? Don't assume everyone knows how to set the proper permissions/ownership. Thanks!