devel.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Thu, 03 Jan 2019 22:13:18 +0200
changeset 2334 c44e4331713c
parent 2228 837f1337c59b
permissions -rw-r--r--
merged

.. -*- coding: utf-8; -*-

=============
 Development
=============
.. contents::
   :local:

Numbers everyone should know
============================

* L1 cache reference 0.5 ns
* Branch mispredict 5 ns
* L2 cache reference 7 ns
* Mutex lock/unlock 100 ns
* Main memory reference 100 ns
* Compress 1K bytes with Zippy 10,000 ns
* Send 2K bytes over 1 Gbps network 20,000 ns
* Read 1 MB sequentially from memory 250,000 ns
* Round trip within same datacenter 500,000 ns
* Disk seek 10,000,000 ns
* Read 1 MB sequentially from network 10,000,000 ns
* Read 1 MB sequentially from disk 30,000,000 ns
* Send packet CA->Netherlands->CA 150,000,000 ns