devel.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Fri, 18 Dec 2020 17:33:30 +0200
changeset 2470 6815c2cba7a1
parent 2228 837f1337c59b
permissions -rw-r--r--
URL map API.
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.. -*- coding: utf-8; -*-
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=============
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 Development
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=============
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.. contents::
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   :local:
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Numbers everyone should know
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============================
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* L1 cache reference 0.5 ns
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* Branch mispredict 5 ns
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* L2 cache reference 7 ns
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* Mutex lock/unlock 100 ns
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* Main memory reference 100 ns
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* Compress 1K bytes with Zippy 10,000 ns
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* Send 2K bytes over 1 Gbps network 20,000 ns
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* Read 1 MB sequentially from memory 250,000 ns
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* Round trip within same datacenter 500,000 ns
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* Disk seek 10,000,000 ns
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* Read 1 MB sequentially from network 10,000,000 ns
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* Read 1 MB sequentially from disk 30,000,000 ns
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* Send packet CA->Netherlands->CA 150,000,000 ns
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