Using Engines and CPUs

Adaptive Server's multithreaded architecture is designed for high performance in both uniprocessor and multiprocessor systems. This chapter describes how Adaptive Server uses engines and CPUs to fulfill client requests and manage internal operations. It introduces Adaptive Server's use of CPU resources, describes the Adaptive Server Symmetric MultiProcessing (SMP) model, and illustrates task scheduling with a processing scenario.

This chapter also gives guidelines for multiprocessor application design and describes how to measure and tune CPU- and engine-related features.

Background concepts

How Adaptive Server processes client requests

Client task implementation

Single-CPU process model

Scheduling engines to the CPU

Scheduling tasks to the engine

Execution task scheduling

Adaptive Server SMP process model

Scheduling engines to CPUs

Scheduling Adaptive Server tasks to engines

Multiple network engines

Task priorities and run queues

Processing scenario

Housekeeper task improves CPU utilization

Side effects of the housekeeper task

Configuring the housekeeper task

Measuring CPU usage

Single-CPU machines

Determining when to configure additional engines

Taking engines offline

Enabling engine-to-CPU affinity

Multiprocessor application design guidelines


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