diegopacheco

wget http://central.maven.org/maven2/org/eclipse/jetty/jetty-distribution/9.4.5.v20170502/jetty-distribution-9.4.5.v20170502.zip
tar -xzvf jetty-distribution-9.4.5.v20170502.zip
rm -rf jetty-distribution-9.4.5.v20170502.zip

cd jetty-distribution-9.4.5.v20170502/
wget webapps/http://mirrors.jenkins.io/war-stable/latest/jenkins.war

sudo mkdir /home/jetty
sudo chown diego:diego /home/jetty

teknoraver

package main

import (
	"context"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"

ehdez73

package com.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

dalegaspi

Installing Python 2.7 on Centos 6.5

Centos 6.* comes with Python 2.6, but we can't just replace it with v2.7 because it's used by the OS internally (apparently) so you will need to install v2.7 (or 3.x, for that matter) along with it. Fortunately, CentOS made this quite painless with their Software Collections Repository

sudo yum update # update yum
sudo yum install centos-release-scl # install SCL 
sudo yum install python27 # install Python 2.7

To use it, you essentially spawn another shell (or script) while enabling the newer version of Python:

awidegreen

# systemd service spec for pulseaudio running in system mode -- not recommended though!
# on arch, put it under /etc/systemd/system/pulseaudio.service
# start with: systemctl start pulseaudio.service
# enable on boot: systemctl enable pulseaudio.service 
[Unit]
Description=Pulseaudio sound server
After=avahi-daemon.service network.target

[Service]
ExecStart=/usr/bin/pulseaudio --system --disallow-exit --disallow-module-loading

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs