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The queue lengths were chosen based on simulation studies. [9] An exception is encountered when the execution unit encounters a branch instruction i.e. either a jump or a call instruction. In this case, the entire queue must be dumped and the contents pointed to by the instruction pointer must be fetched from memory.
A queue has two ends, the top, which is the only position at which the push operation may occur, and the bottom, which is the only position at which the pop operation may occur. A queue may be implemented as circular buffers and linked lists, or by using both the stack pointer and the base pointer.
Retrieve the next instruction from the head of the instruction queue. If the instruction operands are currently in the registers, then If a matching functional unit is available, issue the instruction. Else, as there is no available functional unit, stall the instruction until a station or buffer is free.
Cycle i + 1: an instruction from thread B is issued. Cycle i + 2: an instruction from thread C is issued. This type of multithreading was first called barrel processing, in which the staves of a barrel represent the pipeline stages and their executing threads. Interleaved, preemptive, fine-grained or time-sliced multithreading are more modern ...
Instruction dispatch to an instruction queue (also called instruction buffer or reservation stations). The instruction waits in the queue until its input operands are available. The instruction can leave the queue before older instructions. The instruction is issued to the appropriate functional unit and executed by that unit. The results are ...
Cache prefetching can be accomplished either by hardware or by software. [3]Hardware based prefetching is typically accomplished by having a dedicated hardware mechanism in the processor that watches the stream of instructions or data being requested by the executing program, recognizes the next few elements that the program might need based on this stream and prefetches into the processor's ...
The java.util.Queue interface defines the queue data structure, which stores elements in the order in which they are inserted. New additions go to the end of the line, and elements are removed from the front. It creates a first-in first-out system. This interface is implemented by java.util.LinkedList, java.util.ArrayDeque, and java.util ...
In computer science, yield is an action that occurs in a computer program during multithreading, of forcing a processor to relinquish control of the current running thread, and sending it to the end of the running queue, of the same scheduling priority.