1. Rule of thumb:

workers = [ 1 + number of cores * 2]

1 woker = 6 concurrent user

Odoo need crone workers. So we divide above worker into worker + crone worker

The worker become

worker? = worker -1 \\ worker - Max_cron_threads

max_cron_threads? = 1

memory calculations use total workers

limit-memory-soft? = 640 x workers \ \ Bytes (in binary)memory-hard? = 768MB x workers \ \ Bytes (in binary)

Eg: Core=2, RAM = 2

workers = 1+2*2 = 5

Max_cron_threads = 1

Worker = 4

memory calculations use total workers.

limit-memory-soft = 5*640 = 3200 MB = 3355443200 Bytes

memory-hard = 768 x 5 = 3840 MB = 4026531840 Bytes

2. Max_connection rule [used in postgres conf file]

(1 + workers + max_cron_threads) * db_maxconn ? < ? max_connections

For example, if you have following values:

workers = 1 (minimal value to make long polling work)

max_cron_threads = 2 (default)

db_maxconn = 64 (default)

max_connections = 100 (default)

then (1 + 1 + 2) * 64 = 256 > 100, i.e. the condition is not satisfied and such

deployment may face the error described above.