Questions tagged [high-performance-computing]

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Explanation of roofline model

I am currently studying the roofline model. Wikipedia [2] shows the following example graph: The diagonal line shows $\beta * I$. But I do not understand why this line does not go through the zero ...
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How fast we can run 128-bit LCG generator?

Let's consider some 128-bit LCG generator mod $2^{128}$, with some random 128-bit multiplier and increment. How fast we can run it using the same tricks like in AES: https://crypto.stackexchange.com/...
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Is it possible to generate a better random number generator algorithm from an algorithm that use N computers with one that uses N+1 computers?

Is it possible to generate a better random number generator algorithm from an algorithm that use N number of computers with an algorithm that uses N+1 number of computers? I use the word computer here,...
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Can a classical supercomputer solve a large Max-Cut Problem?

The Fugaku is the most powerful computer. Its performance is 442,010 TFlop/s. That number does not mean much to a layman like me. I want to know how fast it can solve a hard problem. For example, can ...
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Why is it not a good idea to branch a thread outside of a parallel region while other threads are still executing?

Say I have $n$ threads executing in a parallel region and one of them leaves the parallel region when others are still continuing to execute in the parallel region. Why this is a $BAD$ idea? For ...