Iotop is undoubtedly a good tool for Linux IO detection, but in the kernel version and Python version, many friends give up, and so am I. Accidentally found Iopp, written in C, this with iotop is a role, nice! For everyone to share the nextThe
Vector: Included in namespace StdVector name (N_elem);//Create a vector object named name, which can store n_elem elements of type TypeNamefunction is more powerful than arrays, but inefficientArrayArray name;//creates an array object named name
An SQL statement that can be used to track execution. After installing SQL Server, Sqlservermanagementstudio comes with a sqlprofiler, but if the sqlexpress is installed, it will be gone.The main page of the project is in
more than 30 years of good alternatives. In general, these alternatives have been called "NoSQL databases." ” The fundamental problem is that the relational database cannot handle many modern workloads. There are three specific questions: expand to (3TB Green badge) or Facebook (search in 50TB Inbox) or ebay (whole 2PB) to the website like the Digg News review site, Per-server performance and rigorous arch
-a powerful and popular spam filter that uses a variety of detection techniques.
Service discovery
Consul-consule is an Igor service discovery, monitoring and Configuration tool
Doozerd-doozer is a highly available, fully consistent storage for a small amount of very important data
Zookeeper-zookeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization and group services
SmtpSMTP server
Exim-The Mes
an Igor service discovery, monitoring and Configuration tool
Doozerd–doozer is a highly available, fully consistent storage for a small amount of very important data
Zookeeper–zookeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization and group services
SmtpSMTP server
Exim-The Message transfer agent (MTA) developed by Cambridge University
haraka– high-performance, pluggable SMTP server written with JAVAS
Exim-The Message transfer agent (MTA) developed by Cambridge University
Haraka-high-performance, pluggable SMTP server written with JAVASCIRPT
Mailcatcher-ruby Gem deploys a simple SMTP MTA gateway that receives all messages and displays them on the Web interface. Useful for debugging and development.
Maildrop-Open Source one-time mail server, also useful for development
OPENSMTPD-Secure SMTP server implemented from the OpenBSD project
Postfix-Fast, easy to manage a
alternative for more than 30 years. Overall. These alternatives have been called "NoSQL databases." ”The fundamental problem is that relational databases cannot handle very much modern workloads. There are three detailed questions: expand to the website like Digg News Review (3TB green badge) or Facebook (search in 50TB Inbox) or ebay (overall 2PB),Per server performance and rigorous architecture design.Note: (Digg's concept comes from Digg, USA.) It
Basic laravel tutorial-file system/cloud storage overview
Laravel provides a powerful file system abstraction, thanks to the Flyststem PHP package developed by Frank de Jonge. Laravel's file system provides support for some storage drivers, including local file systems, Amazon S3, and Rackspace cloud storage. What's more, it can switch these storage systems through the storage configuration option, because laravel provides a unified API interface for
Build the Android Application Development Environment and system compilation environment on Ubuntu14.10, and ubuntu14.10androidBuild an android Application Development Environment
Install and configure Java JDK.
Download and install Android NDK.
Android ADT downloads and installs the configuration.
Download the Android SDK.
Android Elicpse installation configuration.
Android Studio installation configuration.
# Download and install Oracle JDK ##
JDK 6:Http://www.oracle.com/technetwork/
OpenStack is a free software and open source project, developed and launched by NASA and Rackspace, in collaboration with the Apache license.
OpenStack is an open source cloud computing management Platform project, composed of several major components to accomplish specific tasks. OpenStack supports almost all types of cloud environments, and the project aims to provide a simple, scalable, rich, standard, unified cloud management platform. OpenStack
1. Introduction to OpenStack is a free software and open source code project jointly developed by NASA and Rackspace with Apache license authorization. OpenStack is a cloud platform management project. It is not a software. This project is composed of several major components to complete some specific work. OpenStack is an open-source project designed to provide software for the construction and management of public and private clouds. Its community h
smoothly through mirantis and cloudscaling, and the business model is not clear enough. The crowbar of Dell is a good tool. I have done it to support rhel6.x, which is not complicated, unfortunately, due to restrictions, Juju did not contribute back. Juju itself was positioned to be bigger than openstack. It had a good idea and found a small blue ocean;
Contents [hide]
1 fuel
2 devstack
3 Diablo installation script
4 stackops
5 crowbar
6 Maas + juju
7
. Enter the following command on the terminal:
Sudo update-alternatives -- install/usr/bin/gcc/usr/bin/gcc-4.4 40
Sudo update-alternatives -- install/usr/bin/gcc/usr/bin/gcc-4.1 30
Set the default GCC version. Run the following command:
Sudo update-alternatives -- config gcc
Result:
There are 2 choices for the alternative gcc (providing/usr/bin/gcc ).Se
……Totaldownloadsize:44MIsthisok[y/N]:y3. After the installation is complete, verify that[[emailprotected]~]#java-versionjavaversion"1.6.0_37"OpenJDKRuntimeEnvironment(IcedTea61.13.9)(rhel-1.13.9.4.el5_11-x86_64)OpenJDK64-BitServerVM(build23.25-b01,mixedmode)4. The path to the default installation via Yum is/usr/lib/jvm[[emailprotected]~]#cd/usr/lib/jvm[[emailprotected]jvm]#lltotal24drwxr-xr-x3rootroot4096Jan1220:01java-1.6.0-openjdk-1.6.0.37.x86_64lrwxrwxrwx1rootroot21Jan1220:01jre->/etc/
Check the current Python version.
$ python --versionPython 3.4.2
2. modify the Python version at the system level.
We can use update-alternatives to change the Python version for the entire system. Log on as a root user. first, list all available python alternative versions:
# update-alternatives --list pythonupdate-alternatives: error: no
Ubuntu GNU/Linux 12.04 lts (precise pangolin) released. I wanted to manually install the Sun JDK 6 and 7 on Ubuntu.
Installing Sun JDK 6 on Ubuntu 12.04:
Download the Sun JDK 6 BinFrom here.
Make the BIN file executeable:
chmod +x jdk-6u32-linux-x64.bin
Extract the BIN file:
./jdk-6u32-linux-x64.bin
Move extracted folder to this location:
sudo mv jdk1.6.0_32 /usr/lib/jvm/
Install new Java source in system:
sudo update-alternatives --ins
->/etc/alternatives/java*
Alternatives is a multiple version management software under Linux, which can be used to achieve version switching of JDK, which is described later. First come to the alternatives directory to see what's on the ground.
fordreamxin@compiler207:/etc/alternatives$ ls java*
Java java.1.gz javac
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