Reduce Rails Passenger Thread Counts

Question

My account is limited to 300 process. As I turn on my rail app it ate up 100ps. Does anyone know how to reduce "Passenger Core" and PassengerAgent count?

This is my nginx config:

env GEM_HOME=/home/user/gems;
worker_processes  1;

events {
    worker_connections  256;        # default 1024
}

http {
    access_log  /home/user/logs/user/access_myapp.log  combined;
    error_log   /home/user/logs/user/error_myapp.log   crit;

    include         mime.types;
    passenger_root  /home/user/gems/gems/passenger-5.0.30;
    passenger_ruby  /home/user/bin/ruby;
    sendfile        on;

    passenger_max_instances_per_app  1;
    rails_spawn_method               conservative;
    passenger_max_pool_size 1;      # default 2

    server {
        listen             xxx;
        passenger_enabled  on;
        root               /home/user/myapp/public;
        server_name        localhost;
        rails_env          production;

        location ~* ^/assets/ {
            gzip_static on;
            expires max;
            add_header Cache-Control public;

            add_header Last-Modified "";
            add_header ETag "";
            break;
        }

    }
}

This is output of the ps list: http://pastebin.com/0DcrmxC4

Thanks

Answer 1

Unfortunately, this is the default behavior for Passenger. It spawns a certain number of threads per CPU core on the server, and your server has 40 CPU cores, so it means a lot of threads are spawned.

The thread count can't be adjusted on the free version of Passenger that our installer uses, so if the high number of threads is causing you to bump up against the thread limit, then you can try deploying with a custom server stack, perhaps with Puma.

You can install Puma with the following commands:

cd ~/webapps/your_app
export GEM_HOME=$PWD/gems
export PATH=$PWD/bin:$PATH
gem install puma
gem install therubyracer

Next, edit your project's Gemfile to enable the therubyracer gem, eg:

gem 'therubyracer', platforms: :ruby

Then, stop your Nginx server:

~/webapps/your_app/bin/stop

Then, start Puma on your app's assigned port (eg 12345):

puma -d --port=12345 --dir=~/webapps/your_app/your_project

In my testing, the Puma process used only 18 threads.

I hope this helps! Please let us know if you need anything else.

Answer 2

0

The configuration options are outlined here. Some debugging will have to show what those processes are, but it is possible they are open files.

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answered 23 Feb '17, 22:23

johns ♦♦
5.3k●2●12
accept rate: 23%

I captured the process list after restart and once more after a few hours the result look similar.

(24 Feb '17, 13:49) bliz20

Reduce Rails Passenger Thread Counts

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