How to automatically clean up memory fragments in Redis4.0

This article introduces you how to automatically clean up memory fragments in Redis4.0, the content is very detailed, interested friends can refer to, I hope it can be helpful to you.

By setting up config set activedefrag yes

# redis-cli info memory

# Memory

Used_memory:94924567648

Used_memory_human:88.41G

Used_memory_rss:122715869184

Used_memory_rss_human:114.29G

Used_memory_peak:138010337568

Used_memory_peak_human:128.53G

Used_memory_peak_perc:68.78%

Used_memory_overhead:21483503188

Used_memory_startup:6123112

Used_memory_dataset:73441064460

Used_memory_dataset_perc:77.37%

Total_system_memory:202987839488

Total_system_memory_human:189.05G

Used_memory_lua:37888

Used_memory_lua_human:37.00K

Maxmemory:128849018880

Maxmemory_human:120.00G

Maxmemory_policy:noeviction

Mem_fragmentation_ratio:1.29

Mem_allocator:jemalloc-4.0.3

Active_defrag_running:0

Lazyfree_pending_objects:0

The value of retio is 1.29, indicating that there are a lot of memory fragments.

Execute the following command to start sorting:

[root@redis-cache-225 conf] # redis-cli-p 6379 config set activedefrag yes

OK

It is found that the value of ratio is getting smaller and smaller, indicating that the automatic cleanup feature takes effect:

# redis-cli info memory | grep ratio

Mem_fragmentation_ratio:1.16

# redis-cli info memory | grep ratio

Mem_fragmentation_ratio:1.12

# redis-cli info memory | grep ratio

Mem_fragmentation_ratio:1.09

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