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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...> D[图表显示]
C --> E[报警系统]
end
subgraph "MQTT云平台"
F[MQTT Broker]
G[主题路由]
H[消息持久化]
end
subgraph "温室设备"
I[温湿度传感器]
J[水泵控制器]
K[通风扇控制器]
L[光照...
Clang vs GCC - which produces faster binaries? [closed]
...DATE: GCC 4.8.2 v clang 3.4 comparison is appended to that.
I maintain an OSS tool that is built for Linux with both GCC and Clang,
and with Microsoft's compiler for Windows. The tool, coan, is a preprocessor
and analyser of C/C++ source files and codelines of such: its
computational profile majo...
Context switches much slower in new linux kernels
...f you want your modern Linux OS to have the lowest context switch latency possible, add the following kernel boot parameters to disable all of these power saving features:
On Ubuntu 12.04, you can do this by adding them to the GRUB_CMDLINE_LINUX_DEFAULT entry in /etc/default/grub and then running u...
Difference between GIT and CVS
...t in CVS is easy to do partial checkouts, while it is currently next to impossible in Git. The fact that changes are per-file, grouped together led to invention of GNU Changelog format for commit messages in CVS; Git users use (and some Git tools expect) different convention, with single line descri...
Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...。
随后，不断增长的智能手机用户、日益强劲的大数据云计算能力，以及移动支付技术的发展，使得利用智能手机平台有效调配资源、并完成交易成为可能。卡兰尼克选择车辆作为他的“共享”事业。这满足了共享经济的多个...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...ttp://search.cpan.org
搜索:Time::HiRes和File::Tail：并下载
http://oss.oetiker.ch/rrdtool/pub/?M=D 下载rrdtool-1.2.23.tar.gz
1、安装Time::HiRes
tar zxvf Time-HiRes-1.9707.tar.gz
cd Time-HiRes-1.9707
perl Makefile.PL
make
make test
make install
2、安装File::Tail
tar z...
Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...:
http://www.crackmes.de/users/veneta/crackmes/linux_crackme_v2 。古人云“工欲善其事，必先利其器”，本文中所用到的工具及操作平台罗列如下:
操作平台: gentoo 2004.3 # kernel 2.6.9
逆向工具:
反汇编 -- objdump （这个工具基本上每个LINU...
动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...得非常缓慢，但我们并不知道为什么。现在大家都在拥抱云计算和大数据，这种大规模的生产环境中的诡异问题只会越来越多，很容易占据工程师大部分的时间和精力。大部分问题其实是线上才有的问题，很难复现，或者几乎无...