Answer a computer Architecture question

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about 10 years ago

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Suppose that you are designing a game system that responds to players' pressing buttons and toggling joysticks. The prototype system is failing to react in time to these input events, causing noticeable annoyance to the gamers. You have calculated that you need to improve overall system performance by 50%. This is to say that the entire system needs to be 50% faster than it is now. You know that these I/O events account for 75% of the system workload. You figure that a new I/O interface card should do the trick. If the system's existing I/O card runs at 10 kHz (pulses per second), what is the speed of the I/O card that you need to order from the supplier?

Software Architecture

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@jasonwilczak

I'm bidding because this is intriguing to me. So, the idea is that the current i/o card accounts for 75% of the workload and we want this workload to be 50% faster. We also want the other 25% of the system workload to be 50% faster, but we have no control over that in this scenario. That means, I believe, that we need to increase the card pulses by 50%, of course, which takes care of the card workload. We also need to account for the remainder of the system, to achieve our total 50% increase. That means that we need to add, at least, another 25% more pulses to the card. Therefore, it would be 5kHz(50%) + 2.5kHz(25%) = 7.5 kHz + 10kHz (current card) => 17.5kHz rounded to 18kHz.

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