C++问题--Reis连接redisContext *pRedisContext = redisConnectWithTimeout("127.0.0.1", 6379, tv);pRedisContext->errstr返回错误磁盘空间不足

一、问题

使用C++连接Redis的时候出错，错误String为磁盘空间不足，连接代码如下：

//reids默认监听端口6387
    int iTimeout = 10000;
    struct timeval tv;
    tv.tv_sec = iTimeout / 1000;
    tv.tv_usec = iTimeout * 1000;

    redisContext *pRedisContext = redisConnectWithTimeout("127.0.0.1", 6379, tv);
    if (NULL == pRedisContext || pRedisContext->err)
    {
        printf("%s \r\n", pRedisContext->errstr);
        printf("Connect to redis server failed \n");
        return -1;
    }

　　返回错误值打印：

二、原因

　　出现这个问题的原因是：　　

　　　　1. redis的设置的占用内存太大，例如, 电脑的内存是物理内存是8GB,最大的文件设置内存是 (8)+(2*8) GB为24GB.

　　　　2.也可能是 maxheap 标识有问题,  这个是因为位置文件中少了maxheap的配置　　

　　这个问题已经在Redis.windows.conf里面说明：

# WARNING: not setting maxmemory will cause Redis to terminate with an
# out-of-memory exception if the heap limit is reached.
#

 三、解决办法

　　去除 redis.windows.conf 中# maxmemory <bytes>前的#号，并写上bytes为10240000,如下：

# WARNING: not setting maxmemory will cause Redis to terminate with an
# out-of-memory exception if the heap limit is reached.
#
# NOTE: since Redis uses the system paging file to allocate the heap memory,
# the Working Set memory usage showed by the Windows Task Manager or by other
# tools such as ProcessExplorer will not always be accurate. For example, right
# after a background save of the RDB or the AOF files, the working set value
# may drop significantly. In order to check the correct amount of memory used
# by the redis-server to store the data, use the INFO client command. The INFO
# command shows only the memory used to store the redis data, not the extra
# memory used by the Windows process for its own requirements. Th3 extra amount
# of memory not reported by the INFO command can be calculated subtracting the
# Peak Working Set reported by the Windows Task Manager and the used_memory_peak
# reported by the INFO command.
#
 maxmemory 10240000