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The was essentially made up of four s in a box with an additional special mode that allowed them to operate lock-step in a SIMD fashion. Unlike the 's brute-force approach to performance, the STAR took an entirely different route.
In fact the main processor of the STAR had less performance than thebut added additional hardware and instructions to speed up particularly common supercomputer tasks.
Bythe had reached a dead end; the machine was so incredibly complex that it was impossible to get one working properly.
Even a single faulty component would render the machine non-operational. At the time the company was in serious financial trouble, and with the STAR in the pipeline as well, Norris could not invest the money. In the back yard of the land he purchased in Chippewa FallsCray and a group of former CDC employees started looking for ideas.
At first the concept of building another supercomputer seemed impossible, but after Cray Research's Chief Technology Officer traveled to Wall Street and found a lineup of investors willing to back Cray, all that was needed was a design.
For four years Cray Research designed its first computer. Excitement was so high that a bidding war for the first machine broke out between Lawrence Livermore National Laboratory and Los Alamos National Laboratorythe latter eventually winning and receiving serial number in for a six-month trial.
The NCAR machine was decommissioned in The machine made Seymour Cray a celebrity and his company a success, lasting until the supercomputer crash in the early s. Based on a recommendation by William Perry 's study, the NSA purchased a Cray-1 for theoretical research in cryptanalysis.
In the very advanced Cray-2capable of 1. Normally the transformations being applied are identical across all of the data points in the set. For instance, the program might add 5 to every number in a set of a million numbers.
Internally the computer solves this instruction in several steps. First it reads the instruction from memory and decodes it, then it collects any additional information it needs, in this case the numbers b and c, and then finally runs the operation and stores the results.
The end result is that the computer requires tens or hundreds of millions of cycles to carry out these operations. The user told the machine where in memory the list of numbers was stored, then fed in a single instruction a At first glance it appears the savings are limited; in this case the machine fetches and decodes only a single instruction instead of 1,, thereby saving 1, fetches and decodes, perhaps one-fourth of the overall time.
The real savings are not so obvious. Internally, the CPU of the computer is built up from a number of separate parts dedicated to a single task, for instance, adding a number, or fetching from memory.
Normally, as the instruction flows through the machine, only one part is active at any given time. This means that each sequential step of the entire process must complete before a result can be saved. The addition of an instruction pipeline changes this.
In such machines the CPU will "look ahead" and begin fetching succeeding instructions while the current instruction is still being processed.
In this assembly line fashion any one instruction still requires as long to complete, but as soon as it finishes executing, the next instruction is right behind it, with most of the steps required for its execution already completed.
Vector processors use this technique with one additional trick. On the receipt of a vector instruction, special hardware sets up the memory access for the arrays and stuffs the data into the processor as fast as possible.Here is a list of top ten Computer and Technology magazines that will give you great edge on current Trends and happenings around the Tech torosgazete.com from news these magazines provides Gadget Reviews,How to Tips and solutions to common encountered problem in their Niche.
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