# Questions tagged [high-performance-computing]

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### Explanation of roofline model

I am currently studying the roofline model. Wikipedia  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,...
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 ...