Redis各种数据结构内存占用测试

启动时：（redis为空）

插入数据量都为100W（100W个key或者list中100W个值，或者1000个key，每个key中1000个值）

String

Key value

# Memory

used_memory:121763808

used_memory_human:116.12M

used_memory_rss:124956672

used_memory_peak:121762584

used_memory_peak_human:116.12M

used_memory_lua:31744

mem_fragmentation_ratio:1.03

mem_allocator:jemalloc-3.2.0

List

Key value如下

# Memory

used_memory:81375240

used_memory_human:77.61M

used_memory_rss:84156416

used_memory_peak:121762496

used_memory_peak_human:116.12M

used_memory_lua:31744

mem_fragmentation_ratio:1.03

mem_allocator:jemalloc-3.2.0

Set

Key value

# Memory

used_memory:89764296

used_memory_human:85.61M

used_memory_rss:94650368

used_memory_peak:153269416

used_memory_peak_human:146.17M

used_memory_lua:31744

mem_fragmentation_ratio:1.05

mem_allocator:jemalloc-3.2.0

ZSET

# Memory

used_memory:143119144

used_memory_human:136.49M

used_memory_rss:146919424

used_memory_peak:165802136

used_memory_peak_human:158.12M

used_memory_lua:31744

mem_fragmentation_ratio:1.03

mem_allocator:jemalloc-3.2.0

Hash

# Memory

used_memory:137763776

used_memory_human:131.38M

used_memory_rss:157798400

used_memory_peak:183714248

used_memory_peak_human:175.20M

used_memory_lua:31744

mem_fragmentation_ratio:1.15

mem_allocator:jemalloc-3.2.0

设置：

##ziplist中允许的条目个数

hash-max-ziplist-entries 512

##ziplist中每个条目(K-V)的V允许的最大字节数

hash-max-ziplist-value 64

##如果达到阀值，则重构为hashtable

# Memory

used_memory:21946472

used_memory_human:20.93M

used_memory_rss:25464832

used_memory_peak:183714248

used_memory_peak_human:175.20M

used_memory_lua:31744

mem_fragmentation_ratio:1.16

mem_allocator:jemalloc-3.2.0

结论：100W数据在key和value都在10Byte左右时，占用空间100M左右，若使用Hash的压缩列表特性，内存占用减少到1/5.