Phpredis: PHP 7.1 response time

[btrazzini]

Did you notice that php-redis is taking about 3ms in get or set operations? (PHP 7.1)

Expected behaviour

$redis->set();
PHP 5.6 -> 1ms

Actual behaviour

$redis->set();
PHP 7.1 -> 3ms

I'm seeing this behaviour on

• OS: amazon-linux-ami/2018.03
• Redis: 3.1.1
• PHP: PHP 7.1.17

[yatsukhnenko]

Are you sure it is depends on PHP version and not environment?

[michael-grunder]

I agree with @yatsukhnenko that it seems more related to environment than PHP version. I did a very simple test with a few versions of PHP and don't see any real difference between 5.x and 7.x. My results are far faster than 1ms per call, but I'm doing all tests locally.

[btrazzini]

First of all, thank you for your attention.

I did the tests using the same environment.
Just change the php version installed I could see very different times.

My test was in production (aws):

• EC2 t2.small
• ElasticCache Redis cache.m3.medium

Both using nginx + php-fpm

PS. correcting the versions:

• Redis: 2.8.24
• PHP-Redis: 3.1.1

[yatsukhnenko]

@btrazzini 3.1.1 was released more than year ago. Could you test the latest stable version?

[michael-grunder]

Testing a newer version is a good idea, but I don't think this is really a bug:

Here's averaged GET timings across a bunch of versions of PHP:

PHP 5.6.30 : Sent 5000 GET commands in 95.88 ms
PHP 7.0.17 : Sent 5000 GET commands in 84.61 ms
PHP 7.0.18 : Sent 5000 GET commands in 86.72 ms
PHP 7.1.3  : Sent 5000 GET commands in 87.52 ms
PHP 7.1.5  : Sent 5000 GET commands in 83.53 ms
PHP 7.1.7  : Sent 5000 GET commands in 86.45 ms
PHP 7.1.10 : Sent 5000 GET commands in 99.99 ms
PHP 7.2.6  : Sent 5000 GET commands in 82.65 ms

These are average timings and will still vary a bit run to run, depending on what else is happening on my system. That said, I don't see anything like a 3x difference between any version of php.

[yatsukhnenko]

@btrazzini 3ms is really good result comparing to @michael-grunder's ~90ms :smile: