Clarification on “Test Connection” in Object Cache Settings for Redis

it is for connection test only

?informed me that the server doesn’t support the LSCache extension

I am not sure what is meaning of this , the LSCache and object cache are 2 different components , they work independent from each other

a simplest way to verify object cache usage is 1) connect to redis , check info stats or keys , see if any keys in it

or use debug log , once debug log is enabled , at bottom of html source code , you should see things like

<!-- Page cached by LiteSpeed Cache 6.5.1 on 2024-10-07 19:29:44 -->
<!-- X-LiteSpeed-Cache-Control: public,max-age=604800 -->
<!-- X-LiteSpeed-Tag: 499_HTTP.200,499_home,499_URL./,499_F,499_guest,499_ -->
<!-- Object Cache  [total] 2828 [hit_incall] 2468 [hit] 0 [miss_incall] 168 [miss] 192 [set] 198 -->

Thank You for respond.

So maybe i will describe how it is on my case.

In LiteSpeed Cache plugin settings Redis is “Enabled”, connection test is “Passed”.
But here is the only comment code from HTML source of my page.

<!-- Page optimized by LiteSpeed Cache @2024-10-07 13:45:25 -->
<!-- Page supported by LiteSpeed Cache 6.5.1 on 2024-10-07 13:45:24 -->
<!-- QUIC.cloud UCSS in queue -->

As you see there is not comment <!-- Object Cache (...) --> so it seems even if in Object Cache tab the connection type is “Passed” in reality object cache seems not working on my site.

Where I can enable debug log? I should do this on server side or in plugins settings?

On my hosting server I found application .log file. Here is the part of logs from running Redis app

1913145:M 07 Oct 11:59:59.593 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
1913145:M 07 Oct 11:59:59.593 # Server started, Redis version 3.2.12
1913145:M 07 Oct 11:59:59.593 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
1913145:M 07 Oct 11:59:59.597 * DB loaded from disk: 0.004 seconds
1913145:M 07 Oct 11:59:59.597 * The server is now ready to accept connections on port 6905
1913145:M 07 Oct 12:05:00.028 * 10 changes in 300 seconds. Saving…
1913145:M 07 Oct 12:05:00.028 * Background saving started by pid 1931502
1931502:C 07 Oct 12:05:00.032 * DB saved on disk
1931502:C 07 Oct 12:05:00.032 * RDB: 0 MB of memory used by copy-on-write
1913145:M 07 Oct 12:05:00.128 * Background saving terminated with success
1913145:M 07 Oct 12:30:03.125 * 1 changes in 900 seconds. Saving…
1913145:M 07 Oct 12:30:03.125 * Background saving started by pid 2020437
2020437:C 07 Oct 12:30:03.130 * DB saved on disk
2020437:C 07 Oct 12:30:03.130 * RDB: 0 MB of memory used by copy-on-write
1913145:M 07 Oct 12:30:03.225 * Background saving terminated with success
1913145:M 07 Oct 12:35:04.052 * 10 changes in 300 seconds. Saving…
1913145:M 07 Oct 12:35:04.052 * Background saving started by pid 2040723

Here is info about my hosting server:

Server Architecture Linux 3.10.0-962.3.2.lve1.5.85.el7.x86_64 x86_64
Web Server Apache
PHP Version 8.0.30 (Supports 64-bit values)
PHP SAPI litespeed

Here is the quote from technical support of my hosting provider

Redis is available, but object cache will not work because it requires the LSCache module. Therefore, we recommend not using the Litespeed Cache plugin.

I’m a bit confused now.

• This reply was modified 1 month, 2 weeks ago by xninedesign.

eh? did you purge all after you enable debug log ?

Here’s what I put into the wp-config.php file.

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

In Object setting tab Redis is Enabled, Test connection is “Passed”, Purge all was used and still same in HTML source.

<!-- Page optimized by LiteSpeed Cache @2024-10-07 14:38:35 -->

<!-- Page supported by LiteSpeed Cache 6.5.1 on 2024-10-07 14:38:35 -->
<!-- QUIC.cloud UCSS in queue -->

eh , no , I was meant in LiteSpeed Cache -> Toolbox -> Debug setting -> set debug log to ON , purge all , then open any front page and check comment at foot

Thank You.

I got this!

<!-- Page optimized by LiteSpeed Cache @2024-10-07 14:50:48 --> 
<!-- Page supported by LiteSpeed Cache 6.5.1 on 2024-10-07 14:50:48 --> 
<!-- Object Cache [total] 4643 [hit_incall] 4153 [hit] 386 [miss_incall] 23 [miss] 81 [set] 76 --> 
<!-- QUIC.cloud UCSS in queue -->

So it seems the Object Cache working on my site.
I really don’t understand why the technical support wrote me that Object Cache need LSChache module to work when I am using your plugin.

yeah … maybe they misunderstood something…

Please explain something else.

On another account of my hosting provider I successfully run Redis app in my hosting panel, but even when i use a good port number in port field at settings page of your plugin, Redis is Disabled and Test connection is “Not available”.

I know that something is wrong with my hosting server so I try to get help from technical support.

But here is what I get in the html source code with the above effects:

<!-- Object Cache [total] 11923 [hit_incall] 10914 [hit] 0 [miss_incall] 132 [miss] 877 [set] 881 -->

Please explain to me, when [hit] is 0 it means that Object Cache is not working?

yes , hit 0 means it didn’t get anything from redis

Redis is Disabled?

this means your PHP exntesion for redis is not enabled

But how does it relate to Object Cache?
Does [hit] refer to Object Cache as well?
In other words, if [hit] > 0, does that mean both Redis and Object Cache are working fine?

From what I read on the internet, it is possible for Redis to be enabled on the server without Object Cache working. That’s why I need to know is a [hit] value above 0 indicates that Redis is working or if it also means Object Cache is functioning.

But how does it relate to Object Cache?

the PHP extension for Redis , is the bridge , connects between PHP and Redis server , so without this bridge, your PHP can not communicate to Redis server , without communication , how can you save into it or get data from it ?

• total?is the total number of objects the page requested.
• hit_incall?is the number of objects that did not hit Redis but hit the runtime data from above.
• hit?is the number of objects retrieved from Redis.
• miss_incall?is the number of objects not set in runtime. That is to say, when php ran into the current line, no data was set before.
• miss?is the number of objects not found in Redis.
• set?is the number of objects set in Redis.

Object cache relies on PHP exntesion for Redis, and Redis server

object cache feature provides the API for wordpress , your wp, plugin or theme utilize such API to call object cache , then object cache , through redis extension , save data into or get data from Redis server.