Redis cache - worth it?

[Jon12345]

I already have litespeed installed on my server, which caches the guest visitors. Unfortunately, it does not cache logged in users.

If I add a Redis cache, will that speed up the experience of logged in users? Would it cache anything that litespeed doesn't cache for guests?

 

[m1ne]

Database queries can be cached. Whether you notice a difference depends on the size of your forum.
I've always used Redis regardless of the forum size.
You can also use Xon's addons to cache view counters and flood checking in Redis.

 

[Jon12345]

Does litespeed not cache the database queries, presenting them as straight html? Are you not just having Redis cache but then litespeed does it anyway at the server level?

Not sure what Xon's addons are. I've got so much to learn!

 

[m1ne]

Does litespeed not cache the database queries, presenting them as straight html? Are you not just having Redis cache but then litespeed does it anyway at the server level?

Not sure what Xon's addons are. I've got so much to learn!

Litespeed caches web pages.
Redis can be a database cache and an object cache.

https://blog.litespeedtech.com/2017/07/12/wpw-caching-101/

 

[Jon12345]

I was thinking litespeed caches pages so that dynamic content doesn't need a mysql call. i.e. it is a database cache. Or are you saying that litespeed is effectively a database cache, but Redis will take care of the objects too?

Good to have someone who knows what they are talking about. I've found it a bit tricky to get the answers to these sorts of things. I love trying to make my site faster, it is good fun!

 

[m1ne]

As I understand it, Litespeed will store and cache HTML pages for guests. Database queries are not cached and still may need to be performed if there is something new to grab.
Redis is primarily an object cache but it can cache database queries. To what extent in Xenforo, I'm not sure.

 

[Jon12345]

I read someone that litespeed caches stuff server site, so redis is duplicating some stuff. I will see if I can find the link to where I saw it.

 

[Jon12345]

In any case, I have just come across this: https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:cache:redis

Redis is an open source, in-memory data structure store, used as a database, cache and message broker. LSCache is the world's fastest full page caching. So it's useful for you to have both of them setup on your server.

So I gotta go there anyway.

 

[m1ne]

I don't believe there is any duplication. Redis would be faster anyway since it caches to memory.
The best solution I think is a page cache (LSCache), object cache (Redis) and an opcode cache (PHP Opcache).
You can also configure XF to cache guest pages in Redis.

 

[Jon12345]

I was assuming that if I install Redis on the server, I have to update the config.php anyway for it to work?

Doesn't litespeed cache to memory too?

 

[m1ne]

I was assuming that if I install Redis on the server, I have to update the config.php anyway for it to work?

Doesn't litespeed cache to memory too?

Yes, config.php needs to be updated.
Litespeed can cache to a ramdisk if you set it up.

 

[Jon12345]

I pay for litespeed and LSCache. I presume that LSCache is the caching to memory.

 

[Anatoliy]

Litespeed caches web pages.
Redis can be a database cache and an object cache.

So even I have a LiteSpeed server with LScache, I better install & enable Redis. Correct?

 

[Jon12345]

According to the litespeed site, yes!

@Anatoliy If you do it, let me know how you get on. Really interested to hear if it speeds things up or not.

 

[Anatoliy]

According to the litespeed site, yes!

@Anatoliy If you do it, let me know how you get on. Really interested to hear if it speeds things up or not.

cool

 

[Anatoliy]

well then I should also enable PHP Opcache for complete package )

 

[Jon12345]

I don't know if PHP Opcache helps additionally or not. I have no info on it.

 

[Anatoliy]

Yes, config.php needs to be updated.

so how to check that Redis is working? I can see that LScache is working by 'x-litespeed-cache: hit' in headers. what about Redis?

 

[m1ne]

so how to check that Redis is working? I can see that LScache is working by 'x-litespeed-cache: hit' in headers. what about Redis?

redis-cli monitor in SSH session.

 

[Anatoliy]

redis-cli monitor in SSH session.

thanks! I have no idea what it means, but I'll ask my hosting provider to look into that monitor. )