Around IT In 256 Seconds By Tomasz Nurkiewicz

Podcast for developers, testers, SREs… and their managers. I explain complex and convoluted technologies in a clear way, avoiding buzzwords and hype. Never longer than 4 minutes and 16 seconds.

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7 July 2020

#7: Speed of light

by Tomasz Nurkiewicz

Speed of light is not as abstract to us, software engineers, as you might think. If you are deploying to the cloud or if you want to squeeze every bit of performance in your app, speed of light holds you back

Distance the light travels during one CPU cycle at 5 GHz

\begin{align} c = 3 \cdot 10^8 \mathrm{m \over s} \\ f = 5 \mathrm{GHz} = 5 \cdot 10^9 \mathrm{Hz}\\ t = {1 \over f} \\ s = c \cdot t = {c \over f} \\ s = { {3 \cdot 10^8 \mathrm{m \over s}} \over 5 \cdot 10^9 \mathrm{1 \over s}} = \\ = {3 \over {5 \cdot 10}} \mathrm{m} = {30 \over 5} \mathrm{cm} = \\ 6 \mathrm{cm} \end{align}

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tags: moore - cpu - cdn - ping