High APC Fragmentation

[semprot]

Hi,

I use 2-cpu license litespeed.
I use apc and i have uploaded apc.php.
my apc.ttl is 0.
But apc.php shows very high fragmentation every time i refresh apc.php (my site is busy site), it can reach up to 50%.
what should i do?

apc.cache_by_default	1
apc.canonicalize	1
apc.coredump_unmap	0
apc.enable_cli	1
apc.enabled	1
apc.file_md5	0
apc.file_update_protection	2
apc.filters	
apc.gc_ttl	3600
apc.include_once_override	0
apc.lazy_classes	0
apc.lazy_functions	0
apc.max_file_size	20M
apc.mmap_file_mask	
apc.num_files_hint	1000
apc.preload_path	
apc.report_autofilter	0
apc.rfc1867	0
apc.rfc1867_freq	0
apc.rfc1867_name	APC_UPLOAD_PROGRESS
apc.rfc1867_prefix	upload_
apc.rfc1867_ttl	3600
apc.serializer	default
apc.shm_segments	1
apc.shm_size	256M
apc.slam_defense	1
apc.stat	1
apc.stat_ctime	0
apc.ttl	0
apc.use_request_time	1
apc.user_entries_hint	4096
apc.user_ttl	7200
apc.write_lock	1

[webizen]

try increase apc.shm_size (=> 512M)

also apc.stat=0

[semprot]

Originally Posted by webizen

try increase apc.shm_size (=> 512M)

also apc.stat=0

thanks, apc.stat is 0 now, but once i changed apc.shm_size to 512m, i started getting 503 error on all domains on my server.

Eventhough i have enough free ram (i think)

root@mybox [/home/xxxxx]# free -m
total used free shared buffers cached
Mem: 12001 7501 4500 0 1229 3169
-/+ buffers/cache: 3102 8899
Swap: 2047 0 2047

Once i reverted it back to 256m, the 503 error gone. Do you think i need to upgrade my RAM although i have "enough" (IMO) ram?

[webizen]

increase memory limit (soft/hard) in lsphp5 external app by 256M

[semprot]

Originally Posted by webizen

increase memory limit (soft/hard) in lsphp5 external app by 256M

Thanks.. It works.. At least i will try to increase memory limit once i get 503 / high fragmentation again..

[semprot]

After the litespeed was rebuilt recently, i started getting random 503 errors (not always as old situation) -- even with less traffic.
even though memory soft & hard limit have been set to 1024mb.

APC settings are still the same, at least :
- shm_size is 512mb
- ttl is 0
- stat is 0

Probably some other old litespeed settings were gone?
Is there any other settings other than memory soft & hard limit that i should check?

[webizen]

Pls chk error log & stderr.log for any context

[NiteWave]

After the litespeed was rebuilt recently, i started getting random 503 errors

try
apc.mmap_file_mask=/tmp/APC.XXXXXX

[eva2000]

Originally Posted by semprot

After the litespeed was rebuilt recently, i started getting random 503 errors (not always as old situation) -- even with less traffic.
even though memory soft & hard limit have been set to 1024mb.

APC settings are still the same, at least :
- shm_size is 512mb
- ttl is 0
- stat is 0

Probably some other old litespeed settings were gone?
Is there any other settings other than memory soft & hard limit that i should check?

why set ttl = 0 your memory usage will keep increasing, usually for APC i have something like

apc.ttl=7200
apc.user_ttl=3600
apc.gc_ttl = 600

never had any problems with Litespeed and LSPHP + APC

Of course make sure you aren't using LSPHP with phpSuExec for opcode cache use. I have a mysqlmymonlite.sh script to check for that http://mysqlmymon.com/#litespeedstats

phpSuExec = 0

------------------------------------------------
Litespeed Server & LSAPI PHP Info:
------------------------------------------------
Litespeed web server version: 4.1.12
WHM / Cpanel version: 11.32.2.25

LSPHP phpSuExec status: 
  < phpSuExec >0
  < phpSuExecMaxConn >20

WHM's PHP Handler config:
/usr/local/cpanel/bin/rebuild_phpconf --current

Available handlers: dso cgi none
DEFAULT PHP: 5
PHP4 SAPI: none
PHP5 SAPI: dso
SUEXEC: enabled
RUID2: not installed

PHP 5.3.10 (litespeed) (built: Feb  7 2012 03:02:29)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

[semprot]

Originally Posted by eva2000

why set ttl = 0 your memory usage will keep increasing, usually for APC i have something like

apc.ttl=7200
apc.user_ttl=3600
apc.gc_ttl = 600

never had any problems with Litespeed and LSPHP + APC

Of course make sure you aren't using LSPHP with phpSuExec for opcode cache use. I have a mysqlmymonlite.sh script to check for that http://mysqlmymon.com/#litespeedstats

phpSuExec = 0

------------------------------------------------
Litespeed Server & LSAPI PHP Info:
------------------------------------------------
Litespeed web server version: 4.1.12
WHM / Cpanel version: 11.32.2.25

LSPHP phpSuExec status: 
  < phpSuExec >0
  < phpSuExecMaxConn >20

WHM's PHP Handler config:
/usr/local/cpanel/bin/rebuild_phpconf --current

Available handlers: dso cgi none
DEFAULT PHP: 5
PHP4 SAPI: none
PHP5 SAPI: dso
SUEXEC: enabled
RUID2: not installed

PHP 5.3.10 (litespeed) (built: Feb  7 2012 03:02:29)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

Actually before i set ttl to 0, my fragmentation is very very high. And i read solution to set ttl to 0. And it is fine.
However after everything is fine, i rebuild the php & litespeed for some reason.
Now everything is screwed, apc wont work properly.

I asked on stackoverflow but still no solution.

http://stackoverflow.com/questions/1...etimes-success