Redis内存预估

参考博客Redis 相关数据结构的容量评估_程序员掉头发的博客-CSDN博客_redis容量评估的计算方式，写了个python脚本进行计算。

def calculateBucketCount(cap):
    n = cap - 1;
    n |= n >> 1;
    n |= n >> 2;
    n |= n >> 4;
    n |= n >> 8;
    n |= n >> 16;
    return 1 if n < 0 else n+1

def calculateRedisStringSize(keyLength, valueLength, keyCount):
    keyBucketCount = calculateBucketCount(keyCount)
    return (24 + 16 + (keyLength + 9) + (valueLength + 9) * keyCount) + keyBucketCount * 8;

def calculateRedisHashSize(keyLength, fieldLength, valueLength, keyCount, fieldCount):
        keyBucketCount = calculateBucketCount(keyCount);
        fieldBucketCount = calculateBucketCount(fieldCount);
        return ((16 * 2 + (fieldLength + 9) + (valueLength + 9) + 24) * fieldCount + fieldBucketCount * 8 + 88 + 16 + (keyLength + 9) + 24) * keyCount + keyBucketCount * 8;