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

     2 .. include:: HEADER.rst

     3 

     4 =============

     5  Development

     6 =============

     7 .. contents::

     8    :local:

     9 

    10 Numbers everyone should know

    11 ============================

    12 

    13  * L1 cache reference 0.5 ns

    14  * Branch mispredict 5 ns

    15  * L2 cache reference 7 ns

    16  * Mutex lock/unlock 100 ns

    17  * Main memory reference 100 ns

    18  * Compress 1K bytes with Zippy 10,000 ns

    19  * Send 2K bytes over 1 Gbps network 20,000 ns

    20  * Read 1 MB sequentially from memory 250,000 ns

    21  * Round trip within same datacenter 500,000 ns

    22  * Disk seek 10,000,000 ns

    23  * Read 1 MB sequentially from network 10,000,000 ns

    24  * Read 1 MB sequentially from disk 30,000,000 ns

    25  * Send packet CA->Netherlands->CA 150,000,000 ns

    26