SQL Server 2005 Analysis Services Load Testing...

Summary: Microsoft Visual Studio 2005 Team System includes a Load Test tool that you can use for performance and stress testing of a Microsoft SQL Server 2005 Analysis Services deployment. The Load Test tool runs the tests that you create, and optionally logs the data into a SQL Server database. You can monitor tests as they progress, review performance data after the tests complete, and precisely determine what the threshold is for a specific report server deployment. This article contains step-by-step instructions for installing, creating a unit test, and best practices around stress test methodologies for stress testing Analysis Services. Instructions are also provided for setting up the load test that you use to specify load patterns. The article assumes that you have the AdventureWorks Data Warehouse sample SSAS database so that you can try these steps on your computer.

https://www.codeplex.com/SQLSrvAnalysisSrvcs

and doc here : SSAS Load Testing Best Practices