Redis各類數據結構內存佔用測試

啓動時：（redis爲空）

 

插入數據量都爲100W（100W個key或者list中100W個值，或者1000個key，每一個key中1000個值）

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以下

# 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

 

設置：

##ziplist中容許的條目個數

hash-max-ziplist-entries 512

##ziplist中每一個條目(K-V)的V容許的最大字節數

hash-max-ziplist-value 64

##若是達到閥值，則重構爲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

 

結論：100W數據在key和value都在10Byte左右時，佔用空間100M左右，若使用Hash的壓縮列表特性，內存佔用減小到1/5.