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<?xml version="1.0" encoding="UTF-8"?>
<opml version="1.0">
<head>
<title>fnord0 subscriptions in Google Reader</title>
</head>
<body>
<outline text="(title unknown)" title="(title unknown)"
type="rss"
xmlUrl="http://showmetheco.de/articles/2011/6/%3C%=%20href_to_rss%20%%3E" htmlUrl="http://www.google.com/reader/view/feed%2Fhttp%3A%2F%2Fshowmetheco.de%2Farticles%2F2011%2F6%2F%253C%25%3D%2520href_to_rss%2520%25%253E"/>

本文基本上这为两篇文章的翻译和整合 -- Scalable networking And Why are event-driven server so great

OPPC模型瓶颈

传统服务器模型如Apache为每一个请求生成一个子进程。当用户连接到服务器的一个子进程就产生,并处理连接。每个连接获得一个单独的线程和子进程。当用户请求数据返回时,子进程开始等待数据库操作返回。如果此时另一个用户也请求返回数据,这时就产生了阻塞。

这种模式在非常小的工作负荷是表现良好,当请求的数量变得太大是服务器会压力过于巨大。 当Apache达到进程的最大数量,所有进程都变得缓慢。每个请求都有自己的线程,如果服务代码使用PHP编写时,每个进程所需要的内存量是相当大的[1]。

fork()操作延时

title description date categories slug
QQ协议分析
QQ协议分析
2014-04-16
protocol
qq-protocol

一. 文字聊天协议族(TCPF, Text Chatting Protocol Family)

@pon13y
pon13y / readme.md
Created September 18, 2018 15:38 — forked from max-mapper/readme.md
ffmpeg youtube live event rtmp stream from raspberry pi with raspi camera (raspivid)
  1. compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
  2. create youtube 'live event'. get rtmp url + session id
  3. run this:
raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<SESSION>

you can tweak -b and -fps to your liking. the settings above work well for 1080p. by not specifying width or height we get the full 1920x1080 resolution from the raspi camera