Php-Cgi processes made the reporting server extremely slow

Hi,

I have a big environment of 1000+ secondary servers and lot many clients and using 10.1.7.7000 reporting server with SQL 2005. Problem is my reporting server memory utilization is almost 100% and approx 300 + php-cgi instances in task manager. not able to generate the report. Has someone faced this issue. Plz help.