Enabling Multiprocessing

By default, Odoo is working in multithreading mode. For production deployments, it is recommended to change to the multiprocessing server as it increases stability, and make better usage of the system resources.

To enable multiprocessing you need to edit the Odoo configuration and set a non-zero number of worker processes. The number of workers is calculated based on the number of CPU cores in the system and the available RAM memory.

According to the official Odoo documentation to calculate the workers’ number and required RAM memory size, you can use the following formulas and assumptions:

Worker number calculation

Theoretical maximal number of worker = (system_cpus * 2) + 1

1 worker can serve ~= 6 concurrent users

Cron workers also require CPU

RAM memory size calculation

We will consider that 20% of all requests are heavy requests, and 80% are lighter ones. Heavy requests are using around 1 GB of RAM while the lighter ones are using around 150 MB of RAM

Needed RAM = number_of_workers * ( (light_worker_ratio * light_worker_ram_estimation) + (heavy_worker_ratio * heavy_worker_ram_estimation) )

If you do not know how many CPUs you have on your system, use the following grep command:

grep -c ^processor /proc/cpuinfo

Let’s say you have a system with 4 CPU cores, 8 GB of RAM memory, and 30 concurrent Odoo users.

30 users / 6 = **5** (5 is theoretical number of workers needed )

(4 * 2) + 1 = **9** ( 9 is the theoretical maximum number of workers)

Based on the calculation above, you can use 5 workers + 1 worker for the cron worker that is a total of 6 workers.

Calculate the RAM memory consumption based on the number of workers:

RAM = 6 * ((0.8*150) + (0.2*1024)) ~= 2 GB of RAM

The calculation shows that the Odoo installation will need around 2GB of RAM.

To switch to multiprocessing mode, open the configuration file and append the calculated values:

etc/odoo.conf or etc/odoo-server.conf then add

limit_memory_hard = 2684354560

limit_memory_soft = 2147483648

limit_request = 8192

limit_time_cpu = 600

limit_time_real = 1200

max_cron_threads = 1

workers = 5

sudo /etc/init.d/odoo-server restart

Try this :    in the Odoo config, I changed only two parameters .. 

proxy_mode = True
workers = 3

Ed,

​

I have 28 workers on odoo 15 

48GB RAM, 16Core

all config done based on documentation and i keep getting disconnection errors

im a bit lost with this issue

- My fix was to disable redis.

You probably no longer need this relationship but for anyone who needs it at this precise moment here it is:

Fisrt Step

proxy_mode = True
limit_memory_hard = # Calculate it method in official documentation
limit_memory_soft = # Calculate it method in official documentation
limit_request = 8192
limit_time_cpu = 600
limit_time_real = 1200
max_cron_threads = 2
workers = 2

If you are using reverse proxy, check if your server is generating an HTTP 413 error (occurs when the request is larger than the server allows). Here's how you can fix it, depending on your web server:

• Apache: Set the LimitRequestBody directive in either your httpd.conf file or a local .htaccess file. (https://stackoverflow.com/a/3719358/1688568)

• Nginx: Set the client_max_body_size directive in nginx.conf (http://www.cyberciti.biz/faq/linux-unix-bsd-nginx-413-request-entity-too-large/)

• IIS: Set the uploadreadaheadsize config setting (https://web.archive.org/web/20160204040121/http://blogs.msdn.com:80/b/jiruss/archive/2007/04/13/http-413-request-entity-too-large-can-t-upload-large-files-using-iis6.aspx)

Hi,

You can check out this video explaining the same problem with steps to solve it:  https://www.youtube.com/watch?v=Q1c5XpG85OE

Nginx: https://www.youtube.com/watch?v=-hVYQd7A7PQ&t=138s

Odoo Worker:  https://www.youtube.com/watch?v=dQtIKmNdVgA&t=73s

Thanks

For me, the problem is solved by increasing the number of workers (were 0 and changed to 2), and changed the nginx configuration to have:

client_max_body_size 30M;

Same here. I've just set up a new Odoo 13 (CE) server on Ubuntu 18.04 and Nginx as https proxy.