Reference From Linuxise.com

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:

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

Restart the ODOO server to take effect.

sudo systemctl restart odoo13

Reference Links:

https://linuxize.com/post/how-to-install-odoo-13-on-ubuntu-18-04/

https://www.odoo.com/documentation/13.0/setup/deploy.html