HP Vectra XU 6/XXX HP Vectra XU 6/xxx, Guide to Optimizing performance - Page 19

1 Your PC's Performance Features Advantages of Dual Processor Configurations The following table summarizes the benefits of installing a second Pentium Pro processor according to the operating system and applications you use. Single-threaded operating system Multithreaded operating system Multiple applications None Performance improvement for all applications (even single-threaded) One multithreaded application None Greatest benefit from multiprocessing Other Benefits of Dual Processing One of the most important functions that a processor performs is handling interrupts. An interrupt is a request for attention or service from another area of the PC. The processor's ability to respond to interrupts is an essential part of your PC's operation. Interrupts allow your PC to respond to unexpected events. To handle an interrupt, your processor must first suspend its current activity. This means that your PC's operation will be slowed temporarily while the interrupt is being handled. With two Pentium Pro processors installed the responsibility of handling interrupts is shared between them. When an interrupt request is received, the two processors arbitrate between themselves to see which processor is performing the lowest priority work. The selected processor will be allocated to handle the interrupt, leaving the other processor free to continue with its work. English 13