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Editorial Team
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Asked: 2026-06-14T06:57:52+00:00

I’ve quoted the following from the configuration file of Redis: … maxmemory MAXMEMORY POLICY:

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I’ve quoted the following from the configuration file of Redis:

...
maxmemory

MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
is reached? You can select among five behavior:
...

And here my question goes: What is the correct condition to check when maxmemory is reached?

First, I thought the answer is [used_memory >= maxmemory], where used_memory is showed by the INFO command.

But, now I am confusing that the answer maybe [used_memory_rss >= maxmemory].

What is the correct answer?

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1 Answer

  1. Editorial Team

    The maxmemory parameter is compared to a value calculated from used_memory, not used_memory_rss.

    Now, the exact behavior is not trivial, because Redis tries to estimate the amount of memory taking in account master/slave replication, and AOF buffering. The value is used_memory (as calculated by the allocator wrapper) minus the size of slaves output buffers, minus the size of AOF buffers. Then this value is compared to maxmemory.

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