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Cache for Redis

Performance whitepaper

This topic describes the detailed method and test results of stress testing on Cache for Redis instances using the Memtier-benchmark stress testing tool. You can conduct your own tests and comparisons according to the instructions in this article to quickly understand the performance of the database system.

Test environment

Both the ECS instance and Cache for Redis instances to be tested are in the same region and availability zone. For this test, it was availability zone A in China(Beijing).

The network types are both Virtual Private Cloud (VPC).

tip

Ensure that the ECS instance and Cache for Redis instance are in the same VPC.

Cache for Redis instances used for testing

The database version is Redis 5.0.

The instance type is primary-secondary.

The test object determines the instance specification. Test instances with 16-sharding clusters enabled and instances with 32 sharding clusters enabled respectively. Each shard has 2 GiB of memory.

ECS instances used for testing

Operating system: Debian 10, 64-bit.

During testing, the number of shards enabled in Redis instances varied, and the corresponding ECS configurations also differed:

When testing Redis instances with 16-sharding clusters enabled, the ECS configuration was:

8 general-purpose ECS instances with 32 vCPUs and 128 GiB memory (specification code ecs.g1.8xlarge).

When testing Redis instances with 32-sharding clusters enabled, the ECS configuration was:

12 general-purpose ECS instances with 32 vCPUs and 128 GiB memory (specification code ecs.g1.8xlarge).

Testing tools

Memtier-benchmark is used in this test. Memtier-benchmark is the command line tool developed by Redis Labs. It can be used for load generation and benchmark testing of non-relational, key-value databases. It is the official benchmark tool provided by Redis.Memtier-benchmark is a command-line tool developed by Redis Labs for load generation and benchmarking of non-relational key-value databases, and is the official benchmarking tool provided by Redis.

For information on how to download and install Memtier-benchmark tools, refer to Memtier-benchmark.

Test commands

The following commands are used for stress testing in this test:

memtier_benchmark -s <server-url> -p 6379 -c 20 -t 10 --ratio=1:1 --select-db=0 --test-time=1800 -d 32 -a <password>​

Parameters	Description
-s	Connection address of the Redis database.
-a	Password for the Redis database.
-c	Number of clients simulated to connect per thread during the test.
-d	Size of the object data used for testing. Unit: Byte.
-t	Number of threads used in the test.
--ratio	Read/write ratio of test commands, which is the ratio of SET to GET.
--test-time	Test duration. Unit: seconds.
--select-db	DB number used for testing.

tip

In actual stress testing, Redis instances with different specifications use different max connections. When executing the above stress test commands in an actual test, continuously adjust the number of max connections to achieve higher throughput.

Test results

Single shard memory	Number of shards	Total instance memory	Total concurrent connections	QPS
2 GiB	16	32 GiB	3,200	1,885,000
2 GiB	32	64 GiB	6,400	3,371,000

tip

The metric used for the test results is QPS (Query Per Second), which refers to the number of operations executed by the database per second. Unit: ops/second.

For performance reference values of different Cache for Redis specifications, refer to Instance specifications.

Last updated: 2025.12.17 20:00:42