Reduce number of processes

I have 6 processes “python2.7 /home/seafile/seafile-server-6.1.2/seahub/manage.py runfcgi” running, using 50% of available main memory.
Is there a config option to reduce the number of these processes?

https://manual.seafile.com/config/seafile-conf.html#seafile-fileserver-configuration

I think you cannost setup it on your version, but you can try it or upgrade server version

Ok, I can upgrade to 6.2.2. Which one of the config options is responsible for these processes? Is it worker_threads?

Yes, it is