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SUMMARY
This article describes what the Microsoft Exchange Server Load Simulation
Tool, LoadSim.exe, was designed to do and what its software and hardware
requirements are. For more information, please see the documentation on the
Microsoft Exchange Server CD, Support\LoadSim\LoadSim.doc, the Microsoft
Exchange Performance: Concurrent Users Per Server white paper available on
the Microsoft TechNet CD. Q196404 XADM: Load Simulator Missing in Exchange Server 5.5 MORE INFORMATION
TestsYou can use LoadSim to specify and run three kinds of tests:
You can specify many different test configuration options in LoadSim to simulate the type of activity you expect to see in production and you can save each configuration to a separate .SIM file. This allows you to run a particular configuration multiple times and to use LoadSim in automated mode from the command-line. Software RequirementsLoadSim should be run on Windows NT 3.51 or later. For demonstration purposes, you can run LoadSim on Windows 95. However, if you are going to run large tests, gather performance timing results, or perform directory import, you need to use Windows NT. In addition, you must have a Microsoft Exchange client installed on the computer running LoadSim.Hardware RequirementsIf you use LoadSim for performance analysis, you need to make sure that your client hardware doesn't adversely affect performance results. The response times reported by LoadSim for user actions should be based primarily on server load, not client hardware bottlenecks. To gather accurate performance timing data, your client computer should have at least 32 MB of physical RAM. The number of simulated clients that can be reasonably supported on one physical computer vary with the nature of users chosen. If, for example, you use the Medium default user setting, a 32 MB client computer should support 100 simulated users with little or no degradation in client response time.There are several limiting factors that affect the capability of a particular computer to support a particular type and number of LoadSim users, the effects of these factors vary depending on your topology, your hardware, and your user definitions. Some important considerations are:
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