Any suggestions for significant performance boost under high load?

[m0onspell]

What steps will reproduce the problem?

Writing a basic API ping action, like

class PingAction extends BaseApiAction
{
	public function run()
	{
		return null;
	}
}

with token-authentication filter behind it. MySQL and Redis involved in proccess, typical User model.
That doesn't really matter, everything is quite basic.

What is the expected result?

I want to be able to serve as much requests per second as possible. At least 10k rps.

What do you get instead?

I am getting closely to 5k rps.
If I'll try to increase the load, response times become slower and slower, giving me even less count of succesfully handled requests.

Additional info

It must be a REST API, so no assets factor. My machine is quite powerful with 16 CPU cores. I've spent a lot of time tunning configurations for nginx, PHP-FPM, MySQL and Redis. Also made some Linux kernel settings optimization. I've also read this tutorial: enableSchemaCache helped a LOT, really. Dumping composer autoload also helped. Opcache is enabled. I haven't had a chance to upgrade to php 7.1, I know that will give a slight performance boost, and I also know, that it won't help significantly. But I'll do it.

Otherwise, I am pretty sure that everything is well-configured and optimized.

I've then built a Node.js/Express application with similar action and authentication step on each request. And I have to say, that node app was much-much faster, serving a lot more times of requests, almost out of the box, without any optimizations.

MySQL (after schema caching enabled) and Redis are definitely not the source of the problem - from the monitoring, I can see that they use a very small amount of resources under high load. I think that problem is framework bootstraping on every request. So I found this concept of using bootstraped daemons listening for new requests, like in
https://github.com/php-pm/php-pm
https://github.com/PHPFastCGI/FastCGIDaemon
But I am not sure if those libraries could be integrated easily with Yii2. I think they could really help. What do you guys think?

P.S. Sorry for posting a question here.

Q	A
Yii version	2.0.10
PHP version	7.0
Operating system	Ubuntu Server

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[samdark]

PHP has to initialize everything on each request so 5000 rps sounds OK. phpdaemon and php-pm could be used with Yii but I can't say it's easy.

[samdark]

https://github.com/nizsheanez/yii2-websocket-application

[m0onspell]

@samdark I see. Well, then I'll just go with node/express for this project.
But it's quite interesting to make a research on integration with php-pm, just for fun, I'll investigate that.
I also will look at WebSockets approach instead of REST.
Thanks.

[samdark]

I've linked to websocket ext. not because it's about websockets but because it uses PhpDaemon.