edis authentication memory usage

[Peidong Hu]

I have found additional 400MiB memory size for 'used_memory_rss_human' in my test on Redis when enable the password authentication in Redis.

This the redis-cli 'info memory' command result before and after I turned off the password authentication,

Anybody has an idea if it's expected or unexpected? Any explanation about what is exactly 'used_memory_rss' and how the 400Mib is calculated by Redis?

Thanks, Peidong

============================ Before turned off password authentication==============

Memory

used_memory:8533117760 used_memory_human:7.95G used_memory_rss:9197273088 used_memory_rss_human:8.57G used_memory_peak:8847161832 used_memory_peak_human:8.24G used_memory_peak_perc:96.45% used_memory_overhead:348789144 used_memory_startup:1458832 used_memory_dataset:8184328616 used_memory_dataset_perc:95.93% total_system_memory:135084605440 total_system_memory_human:125.81G used_memory_lua:37888 used_memory_lua_human:37.00K maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction mem_fragmentation_ratio:1.08 mem_allocator:jemalloc-4.0.3 active_defrag_running:0 lazyfree_pending_objects:0 ============================ After turned off password authentication==============

Memory

used_memory:8535654496 used_memory_human:7.95G used_memory_rss:8767234048 used_memory_rss_human:8.17G used_memory_peak:8546810984 used_memory_peak_human:7.96G used_memory_peak_perc:99.87% used_memory_overhead:348628960 used_memory_startup:1458720 used_memory_dataset:8187025536 used_memory_dataset_perc:95.93% total_system_memory:135084605440 total_system_memory_human:125.81G used_memory_lua:37888 used_memory_lua_human:37.00K maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction mem_fragmentation_ratio:1.03 mem_allocator:jemalloc-4.0.3 active_defrag_running:0 lazyfree_pending_objects:0

[Itamar Haber]

Hello Peidong,

I suspect this isn't related to disabling the password, but rather due to the fact that you've restarted the server and reloaded the data.

xref: https://stackoverflow.com/questions/53709773/redis-authentication-memory-usage

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Itamar Haber Technicalist Evangely Phone: +972.54.567.9692