Pre-sale questions

[LiteSpeeder]

I increased the limit from php.ini to 512M
and 1000M, 1200M in lsphp5.

I tried to refresh vbulletin's online.php files 15 times after the error message and i was loaded once.

Edit: I disabled memcache-memcached option of my vbseo script and it seems to be working fine now with the old php settings. A conflict with memcached?

I have xcache and memcache installed on my web server and memcached installed on my db server.

Edit: Hmm... no. When i try to view 200 online users per page, the same error is displayed. I disabled php error warnings when i was playing with the lsws settings and i can't find where to enable it again. It displays a blank white page instead of the error message. Where can i enable it?

[mistwang]

the php error configuration is in php.ini
You should increase the limit in php.ini to match the soft limit.
xcache and memcached may allocate a lot more memory, those will be counted towarding the limit.

[LiteSpeeder]

Alright, it's directly related to caching as you said (xcache, memcached). I increased the limits as below and the problem seems to be fixed for now.

Max Connections: 50
PHP_LSAPI_MAX_REQUESTS=500
PHP_LSAPI_CHILDREN=50

lsphp5 memory soft limit: 512M
lsphp5 memory hard limit: 768M
(under security tab settings are same with the above)

lsphp5 process soft limit: 200
lsphp5 process hard limit: 200
(400 and 450 for security tab settings)

Are these reasonable values for a high traffic web site with 8 GB ram installed on the server?

I decreased Per Client Throttling options and noticed my pages with 100+ small gifs loads slower. So my current settings:

Static Requests/second 100
Dynamic Requests/second 50
Outbound Bandwidth (bytes/sec) 0
Inbound Bandwidth (bytes/sec) 0
Connection Soft Limit 50
Connection Hard Limit 100
Grace Period (sec) 15
Banned Period (sec) 300

I know these are a little high for preventing ddos but i want my pages which have tons of gif and flash load really fast.

What i want is reasonable ddos protection and no performance limit. Especially for Google bot crawling many pages at the same time.

[mistwang]

Usually, only the main page are generated by PHP script, other images/js/css are static files, so, I recommend using "1" as the limit,
However, if you have multiple requests served by PHP dynamically within one page, like some images, you may need to increase the "Dynamic Requests/second", it depends on your site, I do not recommend use a value higher than 5, otherwise it will not serve the purpose.

[LiteSpeeder]

Originally Posted by mistwang

Usually, only the main page are generated by PHP script, other images/js/css are static files, so, I recommend using "1" as the limit,
However, if you have multiple requests served by PHP dynamically within one page, like some images, you may need to increase the "Dynamic Requests/second", it depends on your site, I do not recommend use a value higher than 5, otherwise it will not serve the purpose.

Ok. I figured out the blank white screen problem is because of xcache. When i try to view a page with a big query (vbulletin's online.php file with the max limit of 200) it's rarely loading the page. It was working good with apache. My xcache settings in php.ini:

[xcache-common]
;; install as zend extension (recommended), normally "$extension_dir/xcache.so"
zend_extension = "/usr/local/lib/php/extensions/no-debug-non-zts-20060613/xcache.so"
zend_extension_ts = "c:/php/extensions/php_xcache.dll"
;; For windows users, replace xcache.so with php_xcache.dll
;; or install as extension, make sure your extension_dir setting is correct
;; or win32:

[xcache]
; ini only settings, all the values here is default unless explained
; select low level shm/allocator scheme implemenation
xcache.shm_scheme="mmap"
xcache.size=128M
xcache.count=8
xcache.slots=8K
xcache.ttl=0
xcache.gc_interval=0

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

xcache.test =                Off
; N/A for /dev/zero
xcache.readonly_protection = Off
; for *nix, xcache.mmap_path is a file path, not directory.
; Use something like "/tmp/xcache" if you want to turn on ReadonlyProtection
; 2 group of php won't share the same /tmp/xcache
; for win32, xcache.mmap_path=anonymous map name, not file path
xcache.mmap_path =    "/dev/zero"


; leave it blank(disabled) or "/tmp/phpcore/"
; make sure it's writable by php (without checking open_basedir)
xcache.coredump_directory =   ""

; per request settings
xcache.cacher =               On
xcache.stat   =               On
xcache.optimizer =            On

[xcache.coverager]
; per request settings
; enable coverage data collecting for xcache.coveragedump_directory and xcache_coverager_start/stop/get/clean() functions (will hurt executing performance)
xcache.coverager =          Off

; ini only settings
; make sure it's readable (care open_basedir) by coverage viewer script
; requires xcache.coverager=On

[mistwang]

Just add 128MB to your current limit, Apache may not apply any memory limit.

[LiteSpeeder]

I did. It didn't help. Blank white pages or "Fatal error: Out of memory..."

Serious memory leak with xcache running?

[LiteSpeeder]

I disabled xcache and installed apc. I have the same problem. Out of memory...

php.ini memory limit: 128M
lsphp5 memory soft limit: 512M
lsphp5 memory hard limit: 768M

It doesn't matter if i double these values or not.

[mistwang]

the 128M limit in php.ini is too small, it should be set to match lsphp5 soft limit.

[mistwang]

if you enabled "PHP suEXEC", disable it.