14. Maxclients Setting in Apache Whats a good way to find the maxclients number? MaxClients ≈ (Ram - size of all other processes) / (size of the apache process) We are making an educated guess based on dividing the system memory (our physical RAM) by the maximum size of an apache process, with enough wiggle room to have the operating system run smoothly. To find the size of a running process; ps -ylC apache2 --sort:rss Divide the size by 1024 to get the process size in meg. You can also use pmap, use top to find the pid, then use; pmap -x <pid id> Another handy way of seeing how your memory is doing. free -m and good old VMSTAT to see if your memory is being paged vmstat 5 60