Performance comparison between PhpRedis and Predis (example)

The discussion about the performance comparison between PhpRedis and Predis has been around for a long time. In this article, I will introduce to you how to measure the performance of these libraries based on the most popular framework Laravel.

PhpRedis is a PHP extension for communicating with Redis storage. (Related recommendations: Redis Tutorial)

Predis is an alternative to PhpRedis on pure PHP and does not require any additional C extensions by default, but can optionally be paired with phpiredis.

I tested these two libraries using high-load project code, with about 10K online users.

Test environment:

Operating system: Ubuntu 18.04.2 LTS x86_64

CPU: Intel i7-6820HQ (8) @ 3.600GHz

Memory: 32 gb

PHP: v7.2.15

Laravel: v5.7.25

MySQL: MySQL v5.7

Redis: v5.0.3

PhpRedis: v4.2.0

Predis: v1.1.1

The script generates a cache from the database and stores the convincing model in Redis.

By default, Laravel does not support custom serializers for Redis, but I used the Laravel Lodash package to achieve this.

Result:

Predis (serializer: php)
Execution time: 00:05:53.0355
Cache storage used: 936.92MB
— — — — — — — — — — — — — — — — — — 
Predis (serializer: igbinary)Execution time: 00:07:45.2460
Cache storage used: 342.66MB
— — — — — — — — — — — — — — — — — 
Predis (serializer: igbinary, with ext-phpiredis)Execution time: 00:07:51.9046
Cache storage used: 342.66MB
— — — — — — — — — — — — — — — — — 
PhpRedis (serializer: php)Execution time: 00:01:36.9863
Cache storage used: 936.75MB
— — — — — — — — — — — — — — — — — 
PhpRedis (serializer: igbinary)Execution time: 00:01:37.3176
Cache storage used: 342.66MB

Note:

Execution time：执行时间
Cache storage used：缓存存储

Conclusion:

The speed of PhpRedis is about x6 times. Using the igbinary serializer can reduce the size of stored data by about 3 times. If you install Redis on a different machine, reducing network traffic will speed things up significantly.

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