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AIX 5L Practical Performance Tools and Tuning Guide by IBM Redbooks

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10.2. System Performance Measurement Interface

The System Performance Measurement Interface (SPMI) is an API that provides standardized access to local system resource statistics. In AIX 5L, SPMI mainly uses the perfstat kernel extension (kex) to obtain statistics. SPMI and Remote Statistics Interface (RSi) are utilized by the Performance Toolbox and Performance Aide Products.

By developing SPMI application programs, an user can retrieve information about system performance with minimum system overhead. The SPMI API is supported on both AIX 4.3 and AIX 5L, it has more metrics than the Perfstat API and data is more refined as it provides rates and percentages for some statistics. It also enables user-created data suppliers to export data for ...

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