redis zmap

gistfile1.txt

ruby redis_keys.rb zipmap
redis-cli  info | grep used_memory_human
used_memory_human:18.54M

ruby redis_keys.rb hash
redis-cli  info | grep used_memory_human
used_memory_human:69.92M

ruby redis_keys.rb plain
redis-cli  info | grep used_memory_human
used_memory_human:69.92M


http://redis.io/topics/memory-optimization
http://download.redis.io/redis-stable/src/zipmap.c

redis_keys.rb

require 'redis'

modi = ARGV[0] || 'hash'

NUMBER_OF_KEYS = 1_000_000
KEYS_PER_ZIPMAP = 512

OFFSET = 1_000_000

redis = Redis.new
modulo_zmap = (NUMBER_OF_KEYS / KEYS_PER_ZIPMAP).ceil

NUMBER_OF_KEYS.times do |i|
  key = OFFSET + i
  if modi == 'hash'
    redis.hset("hash", key.to_s, 10_000.to_s)
  elsif modi == 'zipmap'
    hash_key = key % modulo_zmap
    redis.hset("z#{hash_key}", key.to_s, 10_000.to_s)
  elsif modi == 'plain'
    redis.set(key, 10_000.to_s)
  end
end