Redis in the info command in the # memory what does everything mean: __redis

Redis in the info command in the # Memory what does everything mean: Memory

used_memory:22587235376
used_memory_human:21.04g
used_memory_rss:24482635776
Used_memory_rss_human : 22.80G
used_memory_peak:22587235376
used_memory_peak_human:21.04g
total_system_memory : 270921863168
total_system_memory_human:252.32g
used_memory_lua:37888
used_memory_lua_human:37.00k
maxmemory:32212254720
maxmemory_human:30.00g
maxmemory_policy:noeviction
mem_ fragmentation_ratio:1.08
mem_allocator:jemalloc-4.0.3

Reference: http://redisdoc.com/server/info.html