Memory optimization of redis-server in an embedded Linux distribution

Question

I'm trying to optimize a redis-server version 6.0.5 installed in an embedded Linux distribution with 2 GByte of RAM.
At the moment there aren't particular failure of the redis-server.

The output of the top command regarding redis-server is showed below:

Mem: 1539492K used, 342412K free, 80900K shrd, 21288K buff, 412440K cached
CPU:   9% usr   4% sys   0% nic  85% idle   0% io   0% irq   0% sirq
Load average: 1.24 1.32 1.30 1/132 89546
---------------------------------------------------------------------
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
---------------------------------------------------------------------
  248     1 redis    S    1079m  58%   0% /usr/bin/redis-server 127.0.0.1:6379

I would like to highlight the following values:

• for redis-server the higher value in top output is %VSZ = 58%.
• used Memory is 1539492 K (of 2 GB = 2097152 K that is the total RAM)
• only 342412 K of memory is free

---

Without redis-server

Without the process redis-server (I have execute the command systemctl stop redis) the output of the command top become:

Mem: 605764K used, 1276140K free, 81576K shrd, 26832K buff, 417608K cached
CPU:   0% usr   0% sys   0% nic  98% idle   0% io   0% irq   0% sirq
Load average: 0.27 0.15 0.37 2/126 97764

In this context the values relative to the memory are:

• used Memory is 605764 K (of 2 GB = 2097152 K that is the total RAM)
• now 1276140 K of memory is free

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QUESTION: When redis-server is running on my system:

1. the %VSZ value is a too high value?
2. the memory used is too much?