OwnCloud Server PHP configuration

I need to increase the php and MaxRequestWorkers Value in our owncloud server.

The current value is

PHP Memory Limit - 128M

MaxRequestWorkers value is - 150

for eg: consider we have 600 clients what is to be our server configuration and php values ?

Our server configuration is

OS - ubuntu 16.04 LTS

RAM - 10 gb

Processor - Intel Core i5

Graphics - Intel@iron lake

Storage - 3 TB

PHP Configuration

Max_input_time = 60

Memory_limit = 128m

Max_execution_time = 30

Upload_max_filesize = 400m

Post_max_size = 400m

please help us

Dupe of https://central.owncloud.org/t/php-fatal-error-and-server-reached-maxrequestworkers-error-owncloud-9-1-4-stable/9317