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<script src="https://editoy.com/posts/1997.js"></script><noscript>https://editoy.com/posts/1997 Programmers should know numbers<p>Jeff Dean, a brilliant engineer at Google, gave a talk a while ago listing the numbers every engineer should know. I copied these from;here.L1 cache reference 0.5 nsBranch mispredict 5 nsL2 cache reference 7 nsMutex lock/unlock 100 nsMain memory reference 100 nsCompress 1K bytes with Zippy 10,000 nsSend 2K bytes over 1 Gbps network 20,000 nsRead 1 MB sequentially from memory 250,000 nsRound trip within same datacenter 500,000 nsDisk seek 10,000,000 nsRead 1 MB sequentially from network 10,000,000 nsRead 1 MB sequentially from disk 30,000,000 nsSend packet CA->Netherlands->CA 150,000,000 ns</noscript>
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<div class="curation-body"><link href="https://editoy.com/static/media/style/curate.css" rel="stylesheet" type="text/css" /><p style="background-color: rgb(255, 255, 255); font-size: 1.05em; color: rgb(51, 51, 51); font-family: 'Lucida Grande', Verdana, Arial, sans-serif; line-height: 16.787878036499023px; text-align: justify;">Jeff Dean, a brilliant engineer at Google, gave a talk a while ago listing the numbers every engineer should know. I copied these from <a href="http://moderator.appspot.com/#15/e=c9&t=10c" style="color: rgb(184, 91, 90);">here</a>.</p><ul style="margin: 1em 10px 1em 0px; padding: 0px 0px 0px 10px; font-size: 11.818181991577148px; background-color: rgb(255, 255, 255); list-style: none; text-indent: -10px; color: rgb(51, 51, 51); font-family: 'Lucida Grande', Verdana, Arial, sans-serif; line-height: 16.787878036499023px; text-align: justify;"><li style="margin: 7px 0px 8px 10px;">L1 cache reference 0.5 ns</li><li style="margin: 7px 0px 8px 10px;">Branch mispredict 5 ns</li><li style="margin: 7px 0px 8px 10px;">L2 cache reference 7 ns</li><li style="margin: 7px 0px 8px 10px;">Mutex lock/unlock 100 ns</li><li style="margin: 7px 0px 8px 10px;">Main memory reference 100 ns</li><li style="margin: 7px 0px 8px 10px;">Compress 1K bytes with Zippy 10,000 ns</li><li style="margin: 7px 0px 8px 10px;">Send 2K bytes over 1 Gbps network 20,000 ns</li><li style="margin: 7px 0px 8px 10px;">Read 1 MB sequentially from memory 250,000 ns</li><li style="margin: 7px 0px 8px 10px;">Round trip within same datacenter 500,000 ns</li><li style="margin: 7px 0px 8px 10px;">Disk seek 10,000,000 ns</li><li style="margin: 7px 0px 8px 10px;">Read 1 MB sequentially from network 10,000,000 ns</li><li style="margin: 7px 0px 8px 10px;">Read 1 MB sequentially from disk 30,000,000 ns</li><li style="margin: 7px 0px 8px 10px;">Send packet CA->Netherlands->CA 150,000,000 ns</li></ul><p style="background-color: rgb(255, 255, 255); font-size: 1.05em; color: rgb(51, 51, 51); font-family: 'Lucida Grande', Verdana, Arial, sans-serif; line-height: 16.787878036499023px; text-align: justify;"></p><div class="editedby-logo"><a href="https://editoy.com/ruony"><img src="https://editoy.com/static/media/images/editoywith.png">ruony <img class="userthumb" width="32" src="http://graph.facebook.com/1185909836/picture" alt="ruony's image" /></a></div></div>