The Performance Counter DLL Host (PerfHost) service enables remote users and 64-bit applications to query the performance counters that are provided by 32-bit applications. If this service is stopped, only local users and 32-bit applications will be able to query the performance counters provided by 32-bit applications.

This service is installed by default on computers running the 64-bit version of Windows 7, and its startup type is Manual.

When the Performance Counter DLL Host service is started in its default configuration, it logs on by using the Local Service account.

The Performance Counter DLL Host service is dependent upon the following system components:

• Remote Procedure Call (RPC)
• DCOM Server Process Launcher
• RPC Endpoint Mapper