why one application pool has 4 worker processes in IIS
this application pool for Performancepoint service running in sharepoint application server
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Sign up to join this communityAn application pool that contains multiple worker processes is called a Web Garden.
Now, I am not sure if those 4 worker processes were set up during the installation of PerformancePoint or if someone else set them up after the installation. Either way, a web garden is good because:
Reference: What is the difference between Web Farm and Web Garden?