Limiting the number of MySQL instance

Is it possible to limit the number of MySQL process that run? for example i want to limit only 5 process each time. i want it fix 5 each time, if an process dies the a new process will be created.

because i have a problem that a mysql process grows big, from 5 to up to 15 process and that causing the server go slow.

i already follow some tunning MySQL tips on WHT, installing PHP cache and tunning Apache also.. but it doesn't help

thanks

 

 

 

 

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