Hello Everybody,
I am using linux(RHEL4) OS(intel pentium4 3GHz,512MB RAM,40GB HDD) and apache1 web server.Mine is adserving server and it is running normally till yesterday before,but unexpectedly i got "error :maxclient reached " from apache then my apache got hang up.It was happening continously.Then i do seach on this error and got suggestion to increase my maxclient(NOTE:now i had 256 maxclients).
I was advised to increase HARD_SERVER_LIMIT in src/include/httpd.h.
Now i got lot of doubts in my way that is,
1)what are the procedure and constrains to increase maxclient?how many max client i can have as per the above configuration?
2)Is there any command to check out the number of users on our web server?
3)Is there any tool to check the load of apache in easy way?

how come i do make my apache to percieve heavy load?

Please help me.
Thanks in advance.

the maxclients depends on the resources you have. Every new connection might occupy some space out of memory.So you can have some calculation like memoru usage= MaxCoonection*sizeper connection.

Number of users can no be predicted like this . just check nu. of process threads httpd has created with something like this.

ps -elf |grep httpd.