What are the optimal settings for vBOptimize?

[baseballslant]

Hi,

I purchased vBOptimize a few months ago and each and every time I use it, my server crashes due to insufficient memory.

Initially, after enabling the product, it works. The forum is faster, it is caching, there are no errors (that I have seen or have been reported at least), and all looks good. After awhile though, typically 12-24 hours, the site goes down. I ping our host and they get it back up and running.

We have plenty of memory and the site never crashes when vBo is disabled. I use APC and I also have vBSEO (which can hog a lot of memory), but whenever I run the settings test, it says all is fine.

Any thoughts on what could be the issue? Should the cache be flushed more often automatically?

Thanks!

 

[Deceptor]

Hi baseballslant,

I'll presume you're running the latest version which does have measures to combat insufficient memory. If you take a look into "Misc Settings" under the vBO menu then the setting "Global Cache TTL", what is it set to? By default it should be "3600" which means all cache has a lifetime of 1 hour, this system uses the internal operators TTL feature so memory/space is free'd because flushing (like on Memcache) doesn't always delete data - just marks it as expired.

Also, what's your current memory limit on APC?

 

[baseballslant]

Hi Deceptor, thanks for the help.

Currently that is set to 2400, but it was at 3600 for quite some time with the same results.

Our APC limit is 30M

 

[Deceptor]

30MB is a fair bit, however Guest Caching does take its chunk too for active sites. I'd recommend changing the setting to 1800, all cache (from vB Optimise) should clear within 30 minutes then, if you can run for a few hours like this then vB Optimise is not pushing the limitation, if you get an error several hours after it's probably because something else is filling up the cache (possibly vBSEO?).

Ofcourse you can always increase APC cache limit

 

[baseballslant]

Thanks! I'll give it a shot and will let you know.

 

[baseballslant]

Fatal error: Out of memory (allocated 786432) (tried to allocate 1245184 bytes) in .../forums/vbseo.php on line 1211

It seemed like it took longer to go down, but yeah, it just doesn't want to play nice with the way things are setup. Thanks anyway for the help, I think I'll just disable it for now.

 

[Deceptor]

baseballslant - That error relates to runtime memory, not exactly cache or anything. I know your APC is at 30MB, but what about php memory limit in php.ini?

 

[baseballslant]

64M

My host and I reduced APC's cache time too so I am leaving it on for another day.

Thanks!

 

[Deceptor]

Well 64MB memory for PHP should be enough for vBulletin but as you're aware vBSEO does use a lot of resources - it wouldn't hurt increasing that, I doubt it's the cache size allocated in APC causing the issue. Let me know how it goes though

 

[baseballslant]

We increased memory to 128M and it took a bit longer, but we still went down. For now, I am just going to disable as it seems like it is just a bit too taxing for us and vBSEO is more important right now than vBOptimize

Thank you however for your support and I will keep an eye out on future upgrades.

 

[Deceptor]

baseballslant - Seems odd that the error would still occur, though APC isn't something I've used in a long time as it's been surpassed by XCache. Not really much more I can do here unfortunately. Let me know if you have any further questions