https://slow-is-smooth.io/tags/performance/Recent content in Performance on Shai AsherHugoen-gbSun, 06 Sep 2026 09:00:00 +0300https://slow-is-smooth.io/blog/cache-stampede-war-story/Sun, 06 Sep 2026 09:00:00 +0300https://slow-is-smooth.io/blog/cache-stampede-war-story/<h2 id="0247">02:47</h2> <p>Falafel Corp runs a one-person on-call rotation, which is a staffing decision that looks efficient right up until the night it isn&rsquo;t. Tonight it is your turn, and the phone goes off on the nightstand, and you are awake before you are conscious.</p>https://slow-is-smooth.io/blog/finding-errors-in-log-streams/Sat, 05 Sep 2026 12:00:00 +0300https://slow-is-smooth.io/blog/finding-errors-in-log-streams/<p>Two questions come up constantly when processing large log files:</p> <blockquote> <p><strong>Where is the 1000th error?</strong></p> <p><strong>How many errors happened before this timestamp?</strong></p> </blockquote> <p>They look trivial. At scale they are not. The obvious implementation scans the whole dataset for every question, and with ten million entries that is ten million comparisons to answer one of them.</p>