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.
