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why one application pool has 4 worker processes in IIS

this application pool for Performancepoint service running in sharepoint application server enter image description here

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An 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:

  • Provides better application availability by sharing requests between multiple worker process.
  • Web garden uses processor affinity where application can be swapped out based on preference and tag setting.
  • Less consumption of physical space for web garden configuration.

Reference: What is the difference between Web Farm and Web Garden?

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