LiteSpeed Support Forums - [solved] Rapid APC Caching Causes Fragmentation

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[solved] Rapid APC Caching Causes Fragmentation

I have a feature on my website to cache visitor guests on each page.

If i enabled that feature - which means apc stores lot of things (page) rapidly, because i have lot of visitors, fragmentation increases overtime, and i have to restart httpd sometimes.

If i disable that feature, everything is fine.

Here is my APC setting

Code:

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        /home/apc/apc.m8wvpV

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        6144M

apc.slam_defense        1

apc.stat        0

apc.stat_ctime        0

apc.ttl        0

apc.use_request_time        1

apc.user_entries_hint        16384

apc.user_ttl        7200

apc.write_lock        1

Here is some of my lsws setting

Code:

PHP_LSAPI_MAX_REQUESTS=2500

PHP_LSAPI_CHILDREN=35

LSAPI_AVOID_FORK=1

I think the saved visitor cache is a kind of "full generated-html code", so for example the cache "size" for each page could reach +- 100kb.
Does that mean i should increase apc.user_entries_hint to more than 100kb?

Quote:

Does that mean i should increase apc.user_entries_hint to more than 100kb?

no, user_entries_hint is number of enties, each entry size is 100kb if your guess right.

Quote:

Originally Posted by NiteWave (Post 39190)

no, user_entries_hint is number of enties, each entry size is 100kb if your guess right.

so if i want to cache variable that has X kb in size, user_entries_hint must be exactly minimal X kb in size to avoid defragmentation?

Quote:

so if i want to cache variable that has X kb in size, user_entries_hint must be exactly minimal X kb in size to avoid defragmentation?

no, it's not much related. do you know how many variables will be cached ?
say there are 100 variables, then set user_entries_hint a bit larger than 100, e.g., 120 will avoid fragmentation.

Quote:

Originally Posted by NiteWave (Post 39207)

no, it's not much related. do you know how many variables will be cached ?
say there are 100 variables, then set user_entries_hint a bit larger than 100, e.g., 120 will avoid fragmentation.

Sorry i still don't understand.

If i want to cache 3 variables at same script execution :

PHP Code:


		
			
$one = '1234567890';// 10 characters

$two = '123456789012345';// 15 characters

$three = '12345678901234567890';// 20 characters

user_entries_hint should be larger than which one?

> 3 (number of variables)
> 45 (10 characters + 15 characters + 20 characters)
> 20 (max characters on all variables)

the 1st one:
> 3 (number of variables)

Quote:

Originally Posted by NiteWave (Post 39209)

the 1st one:
> 3 (number of variables)

Thanks... :)