Alternate Cache [APC]

[Zhana]

Hi,

I am thinking to use PAC as an alternate cache. I've been using using memcached, however after upgrading to IPB 3.1.2, the forum has become slow.

• If I install APC, what IPB content is going to be cached?
• What are the best settings to use APC with IPB? For example, apc.stat = off, query cache enabled, etc.
• Will APC cache database queries?
• And anyone using APC here?
  

Thank you.

[Owdy]

http://community.invisionpower.com/topic/264231-best-setting-for-apc/
I have tryed it, page loads seems same. Bencmarks says same. IPB doesnt benefit from APC.

[Zhana]

Oh...So no need to install APC? Should I stick with memcached?


Thank you.

[Owdy]

Oh...So no need to install APC?

IMO, no need. IPB doesnt load any faster with APC. Its like it doesnt detect it at all.

[Connor T]

It detects it at higher levels. Maybe if your under 10k members/posts but trust me the more posts you get and more users you get, this will benefit a ton.

[Owdy]

It detects it at higher levels. Maybe if your under 10k members/posts but trust me the more posts you get and more users you get, this will benefit a ton.

Well, my site has 240 000 posts and 5000 members and APC doesnt change anything.

[Connor T]

Ouch. Maybe its not set up correctly.

[Owdy]

It works fine with other scripts, like SMF etc.

[Zhana]

How much PHP parsing is done when creating / reading a thread does any one knows?



Thank you.

[Zhana]

I mean how much code is compiled each time?

[Zhana]

Ok installed, and it seems to be working. For stats check your apc.php file.

[Zhana]

Owdy what happened bro, is it working on your end?

[Owdy]

APC is working, but IPB doesnt load any faster. Its useless with IPB. My SMF flyes with that, so its working allright.

[Owdy]

Waite, apc.php says uptime 4 minutes, then its start all over. It boots all the time. is that normal?

[Ryan H.]

Waite, apc.php says uptime 4 minutes, then its start all over. It boots all the time. is that normal?

APC is apparently tied to a PHP process; if that process is regularly being killed, it's not going to build up a decent cache. There are probably quite a few things which could cause that to happen. Two I came across in a search are Apache restarting every 15 minutes, and a 'Max Idle Time' setting [Litespeed server] not letting processes survive.

[Owdy]

I increased max_execution_time from 30 to 60, now its been up 17 minutes. Lets see what happends. But, same old thing, pages doesnt load any faster.



My site: http://hoitajat.net/foorumi/

[Owdy]

Nah, it boots under 20 minutes :(

[Zhana]

100% Fragmentation.... mine is 0.08%


And regarding the apache issue, do you have too much load on your server?

[Zhana]

BTW update your version to the latest one, 3.1.4. See if it fixes the issue.

[Owdy]

Ah darn, i remove it. Is there any other cache i could try?

[Zhana]

Memcached. That's what I used before.

[Owdy]

Hmm, that seems slowing things. Is this correct?

$INFO['use_memcache'] = '1';
$INFO['memcache_server_1'] = 'localhost';
$INFO['memcache_port_1'] = '11211';

# netstat -tap | grep memcached

tcp        0      0 localhost:11211         *:*                     LISTEN      15239/memcached 

[Zhana]

Seems to be correct, try changing localhost to 127.0.0.1.

[phinsup]

Figured I would throw my results up here. I tried memcache, APC and eaccellerator.

memcache: I noticed very little improvement if any at all in page loads execution times. Load times .15xx before install .1487 after, not impressive.

APC: Absolutely no difference, doesn't seem to do anything, verified that it was set up and running, just no improvement.

eaccellerator: main page was loading .15xxx seconds before install, after install .100xx to .11xx, not a bad improvement.

My biggest improvement however came from switching from suPHP to fcgi and suhosin, pages loaded in about 1/3rd the time they did under suphp.

[Owdy]

I confirm that, APC doesnt make IPB any faster. It works great with other scripts. FCGI, i confrim that too. However, i cant use it because it creates tons of errors in my IPB site.

[warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function
[warn] (104)Connection reset by peer: mod_fcgid: read data from fastcgi server error.
[error] [client 88.115.*****] Premature end of script headers: index.php, referer: http://hoitajat.net/foorumi/topic/5615-lopputili/
[warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function