Prashant Shahi prashant-shahi

GNU Make Cheatsheet

Based on https://www.gnu.org/software/make/manual/html_node/Quick-Reference.html

Directives

Directive	Description
`define variable` `define variable =` `define variable :=` `define variable ::=` `define variable +=` `define variable ?=` `endef`	Define multi-line variables.
`undefine variable`	Undefining variables.

In experience to get a proper working multiple wan configuration using mwan3 starting from scratch you should:

Important: this works well on OpenWRT 15.05.1, on newer versions there was some breaking changes, for example, the wan ifaces have ipv6 capability and now are named with letters ("wan, wanb... , wanc" instead of "wan, wan2... wan3" so wanb6 means 2nd wan ipv6.): https://github.com/openwrt/packages/blob/master/net/mwan3/files/etc/config/mwan3

The official documentation seems to be very detailed and up to date, I recommend reading those first: https://openwrt.org/docs/guide-user/network/wan/multiwan/mwan3 but I recommend to give a look at my config file below, since my approach for policyes is very nice.

First of all: Activate conntrack, docs says that is important and neccesary to get MWAN3 work properly, and it is needed to reboot:

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

Optimizing postgresql table for more than 100K inserts per second

Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
Add synchronous_commit = off to postgresql.conf.
Use table inheritance for fast removal of old data:

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Translations: (No guarantee that the translations are up-to-date)

🇫🇷 Cette liste en français

	/*
	Small demo to show chaining of API calls. We're using these APIs:
	https://weathers.co for current weather in 3 cities, and
	https://api.github.com/search/repositories?q=<term> to search GitHub repos for
	the 'hottest' city. For example, we'll grab weather for 3 cities, pick the hottest one,
	then hit GitHub with a search for repos that have that city's name. A bit nonsensical
	but I just wanted to demonstrate using the results of one API call to populate a second.

	The problem we're trying to solve is that the API calls are asynch, and one of them
	(getCityTemperatures) loops through several asynch calls (one for each city), and they

	pragma solidity ^0.4.11;
	contract BikramSamvat{

	/*
	* Unix timestamp to Bikram Samvat (Date Time Library)
	* @NepalBitcoin
	*/

	address Bikram;
	enum DaysInWeek{SUN,MON,TUE,WED,THU,FRI,SAT}

	Originall From: Posted 2015-05-29 http://ubwg.net/b/full-list-of-ffmpeg-flags-and-options

	This is the complete list that’s outputted by ffmpeg when running ffmpeg -h full.

	usage: ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…

	Getting help:
	-h — print basic options
	-h long — print more options
	-h full — print all options (including all format and codec specific options, very long)

	package main

	import (
	"bytes"
	"html/template"
	"log"

	gomail "gopkg.in/gomail.v2"
	)

	const convertToKebabCase = (string) => {
	return string.replace(/\s+/g, '-').toLowerCase();
	}