Check Linux Load

If Mysql causing the load so you can use following commands to check it
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    mysqladmin pr

    mysqladmin -u root processlist

    mysqladmin version

    watch mysqladmin proc

If Apache causing the load so check using following commands
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    netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort –n

    netstat -an |grep :80 |wc –l

    netstat -n | grep :80 | wc -l;uptime ; netstat -n | wc –l

    netstat –tupl

    pidof httpd

    history | netstat

    lsof -p pid

If mysql is causing load so you can check it using following commands
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    mysqladmin -u root processlist

    mysqladmin version

    watch mysqladmin proc

    mysqladmin -u root processlist

To check ipd of php
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lsof  -p pid

netstat -an |grep :80 |wc –l

netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n

netstat -na |grep :80 |sort