redis - 如何找到分配给redis实例的内存？

Question

使用 Redisinfo命令，我可以获得 redis 服务器的所有统计信息。我还能够获得使用的内存指标。

如何获取分配给 Redis 实例的总内存，以便获取已使用内存的百分比？

Answer 1

You could do something like:

$ ps aux -m | grep redis-server | head -n1 |  awk '{printf "VSZ: %dMB, RSS: %dMB\n", $5/1024, $6/1024}'

This will display the rounded Virtual and Real memory sizes of the redis-server process in MB (to see actual numbers remove the /1024 from both parameters).

Answer 2

Redis 默认获取所有可用内存（根据需要和所有可用物理内存）。maxmemory不过，您可以使用文件中的参数来限制分配给 Redis 的内存量redis.conf。

这是该文件的摘录：

# Don't use more memory than the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys with an
# EXPIRE set. It will try to start freeing keys that are going to expire
# in little time and preserve keys with a longer time to live.
# Redis will also try to remove objects from free lists if possible.
#
# If all this fails, Redis will start to reply with errors to commands
# that will use more memory, like SET, LPUSH, and so on, and will continue
# to reply to most read-only commands like GET.
#
# WARNING: maxmemory can be a good idea mainly if you want to use Redis as a
# 'state' server or cache, not as a real DB. When Redis is used as a real
# database the memory usage will grow over the weeks, it will be obvious if
# it is going to use too much memory in the long run, and you'll have the time
# to upgrade. With maxmemory after the limit is reached you'll start to get
# errors for write operations, and this may even lead to DB inconsistency.
#
# maxmemory <bytes>