redis object cache major bug

[zoddshop]

I have been speaking with Till from your team and there is a bug in Redis Object Cache My redis is using 6gigabytes and memory. Your plugin is only 2 mb..

Memory

used_memory:5773951216 used_memory_human:5.38G used_memory_rss:5945475072 used_memory_rss_human:5.54G used_memory_peak:5804663688 used_memory_peak_human:5.41G used_memory_peak_perc:99.47% used_memory_overhead:319616504 used_memory_startup:809640 used_memory_dataset:5454334712 used_memory_dataset_perc:94.48% allocator_allocated:5774381592 allocator_active:5910495232 allocator_resident:5996994560 total_system_memory:134891732992 total_system_memory_human:125.63G used_memory_lua:41984 used_memory_lua_human:41.00K used_memory_scripts:0 used_memory_scripts_human:0B number_of_cached_scripts:0 maxmemory:17179869184 maxmemory_human:16.00G maxmemory_policy:allkeys-lfu

[zoddshop]

Your plugin is the only one accessing redis.. It seem redis object cache is ineffective because it wont use over 2mb. I've tested it on several servers already.

[tillkruss]

Please post the plugin's diagnostics.

[zoddshop]

Status: Connected Client: PhpRedis (v5.3.7) Drop-in: Valid Disabled: No Ping: 1 Errors: [] PhpRedis: 5.3.7 Relay: Not loaded Predis: Not loaded Credis: Not loaded PHP Version: 8.1.14 Plugin Version: 2.3.0 Redis Version: 6.0.16 Multisite: No Metrics: Enabled Metrics recorded: 1847 Filesystem: Working Global Prefix: "wp" Blog Prefix: "wp" WP_REDIS_PLUGIN_PATH: "/usr/local/lsws/Example/html/wordpress/wp-content/plugins/redis-cache" Global Groups: [ "blog-details", "blog-id-cache", "blog-lookup", "global-posts", "networks", "rss", "sites", "site-details", "site-lookup", "site-options", "site-transient", "users", "useremail", "userlogins", "usermeta", "user_meta", "userslugs", "redis-cache", "blog_meta" ] Ignored Groups: [ "counts", "plugins", "themes", "theme_json" ] Unflushable Groups: [] Groups Types: { "blog-details": "global", "blog-id-cache": "global", "blog-lookup": "global", "global-posts": "global", "networks": "global", "rss": "global", "sites": "global", "site-details": "global", "site-lookup": "global", "site-options": "global", "site-transient": "global", "users": "global", "useremail": "global", "userlogins": "global", "usermeta": "global", "user_meta": "global", "userslugs": "global", "redis-cache": "global", "counts": "ignored", "plugins": "ignored", "themes": "ignored", "blog_meta": "global", "theme_json": "ignored" } Drop-ins: [ "Redis Object Cache Drop-In v2.3.0 by Till Krüss" ]

[tillkruss]

You don't seem to have defined any WP_REDIS_* constants.

Please make sure Redis Object Cache is pointed to the correct Redis instance by following the installation instructions in the README.

[zoddshop]

still did not change anything with constants defined. the plugin maxes out at 1.75mb... yet my redis info shows it is using 6gb

Status: Connected Client: PhpRedis (v5.3.7) Drop-in: Valid Disabled: No Ping: 1 Errors: [] PhpRedis: 5.3.7 Relay: Not loaded Predis: Not loaded Credis: Not loaded PHP Version: 8.1.14 Plugin Version: 2.3.0 Redis Version: 6.0.16 Multisite: No Metrics: Enabled Metrics recorded: 2089 Filesystem: Working Global Prefix: "wp" Blog Prefix: "wp" WP_REDIS_HOST: "127.0.0.1" WP_REDIS_PORT: 6379 WP_REDIS_DATABASE: 0 WP_REDIS_TIMEOUT: 1 WP_REDIS_READ_TIMEOUT: 1 WP_REDIS_PREFIX: "btc" WP_REDIS_PLUGIN_PATH: "/usr/local/lsws/Example/html/wordpress/wp-content/plugins/redis-cache" Global Groups: [ "blog-details", "blog-id-cache", "blog-lookup", "global-posts", "networks", "rss", "sites", "site-details", "site-lookup", "site-options", "site-transient", "users", "useremail", "userlogins", "usermeta", "user_meta", "userslugs", "redis-cache", "blog_meta" ] Ignored Groups: [ "counts", "plugins", "themes", "theme_json" ] Unflushable Groups: [] Groups Types: { "blog-details": "global", "blog-id-cache": "global", "blog-lookup": "global", "global-posts": "global", "networks": "global", "rss": "global", "sites": "global", "site-details": "global", "site-lookup": "global", "site-options": "global", "site-transient": "global", "users": "global", "useremail": "global", "userlogins": "global", "usermeta": "global", "user_meta": "global", "userslugs": "global", "redis-cache": "global", "counts": "ignored", "plugins": "ignored", "themes": "ignored", "blog_meta": "global", "theme_json": "ignored" } Drop-ins: [ "Redis Object Cache Drop-In v2.3.0 by Till Krüss" ]

[tillkruss]

No that we have the correct server host and port. What does this show:

redis-cli -h 127.0.0.1 -p 6379 INFO MEMORY | grep 'used_memory'

This must be executed on the server running WordPress.

[zoddshop]

used_memory:4914199080 used_memory_human:4.58G used_memory_rss:5016317952 used_memory_rss_human:4.67G used_memory_peak:4997724152 used_memory_peak_human:4.65G used_memory_peak_perc:98.33% used_memory_overhead:180364400 used_memory_startup:809640 used_memory_dataset:4733834680 used_memory_dataset_perc:96.35% used_memory_lua:41984 used_memory_lua_human:41.00K used_memory_scripts:0 used_memory_scripts_human:0B

[tillkruss]

Aha. the 2MB is for the current page. Not the entire cache.

[tillkruss]

Clarified in f6501c60fc405926ab5cf05c2e8f82de47d855a0.