yodermk

# The general procedure here is adapted from the 7->8 guide here. https://www.tecmint.com/upgrade-centos-7-to-centos-8/
#
# It is a curated list of my bash history. I entered other commands so hopefully I got the right ones here.

yum upgrade
reboot
dnf install epel-release
dnf install rpmconf
dnf install yum-utils
rpmconf -a  # answer "n" to both things

andrey-legayev

<?php

/**
 * Binary search - search element in sorted array of values and return true/false
 *
 * @param $value
 * @param $array array
 * @return bool
 */
function in_array_binary($value, array &$array)

Nihhaar

Linux simple performance tweaks

Change the I/O Scheduler

Open $ vim /etc/default/grub then add elevator=noop next to GRUB_CMDLINE_LINUX_DEFAULT. Run $ update-grub and $ cat /sys/block/sda/queue/scheduler to be sure that noop is being used:

$ vim /etc/default/grub
$ update-grub
$ cat /sys/block/sda/queue/scheduler

[noop] deadline cfq

sergey-dryabzhinsky

###
# Proxmox or other server kernel params cheap tune and secure.
# Try it if you have heavy load on server - network or memory / disk.
# No harm assumed but keep your eyes open.
#
# @updated: 2020-02-06 - more params used, adjust some params values, more comments on params
#

### NETWORK ###

mcastelino

The netfilter hooks in the kernel and where they hook in the packet flow

The figure below calls out

• The netfilter hooks
• The order of table traversal

flibitijibibo

A week ago I was CC'd in on a thread about Linux packaging, and how to avoid doing it the wrong way (i.e. RPM, Deb, etc.). I've always used MojoSetup and I've never forced distributions to do any additional work, but this is still a new concept to a lot of people. Additionally, Amos suggested that I expand on Itch's FNA appendix, so here's a guide on how I package my games.

This is a bit of an expansion on my MAGFest 2016 presentation, which you can find here:

http://www.flibitijibibo.com/magfest2016/

https://www.youtube.com/watch?v=B83CWUh0Log

I would recommend looking at that first! After that, read on...

josh-padnick

#!/bin/bash
#
# Convert ssh-agent output to fish shell
#

eval "$(ssh-agent)" >/dev/null

echo "set SSH_AUTH_SOCK \"$SSH_AUTH_SOCK\"; export SSH_AUTH_SOCK"
echo "set SSH_AGENT_PID \"$SSH_AGENT_PID\"; export SSH_AGENT_PID"

nkt

wrk -t4 -c400 -d10s http://127.0.0.1:1337/

PHP

Running 10s test @ http://127.0.0.1:1337/
  4 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
 Latency 7.02ms 6.94ms 82.86ms 85.27%

Luthaf

#include "Foo.hpp"
#include <iostream>
using namespace std;


Foo::Foo(int _a, int _b): a(_a), b(_b){
    cout << "C++ side, constructor" << endl;
}

Foo::~Foo(){

nunoveloso

/**
 * Home mande method to do array_diff ~10x faster that PHP built-in.
 *
 * @param The array to compare from
 * @param An array to compare against
 *
 * @return an array containing all the entries from array1 that are not present in array2.
 */
function nuno_array_diff($array1, $array2) {
  $diff = array();