Aliaksandr Belik aliesbelik

Install tsung centos 7

yum -y install erlang perl perl-RRD-Simple.noarch perl-Log-Log4perl-RRDs.noarch gnuplot perl-Template-Toolkit
wget http://tsung.erlang-projects.org/dist/tsung-1.6.0.tar.gz
tar xfz tsung-1.6.0.tar.gz
cd tsung-1.6.0
./configure && make && make install

mkdir /root/.tsung

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400,000 to 500,000 requests per second (clustered), most what i saw is 50,000 to 80,000 (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Step by step guide to setting up IDEA to write gatling simulations

Prerequisites:

Have [SBT plugin][sbt-plugin] installed

Begin

[Create a new project][create-project] in IDEA ( File > New Project ...)
- Make sure you select a maven module

Dockerized JMeter - A Distributed Load Testing Workflow

Supported Cloud Providers:

Images used:

JMeter Server aka "Slave"
JMeter Client non-GUI aka "Master"

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

Writing a Tsung plugin

This is a simple tutorial on writing a tsung plugin and a repost of our ProcessOne tutorial.

Since tsung is used to test servers lets define a simple server for testing. myserver.erl provides 3 operations: echo, add and subtract.

myserver.erl assumes the first byte to be a control instruction followed by 2 or more byte data. The echo operation merely returns the byte data while add and subtract performs these operations on the 2 byte data before returning the results. See the code of myserver.erl for details.

We assume the source files for tsung-1.2.1 are available. This example was compiled using Erlang OTP R11B-3.

	#!/usr/bin/perl
	use strict;
	use warnings;

	print "Processing ${ARGV[0]}, filtering domain ${ARGV[1]}\n";
	open INPUT, ${ARGV[0]} or die $!;
	open OUTPUT, ">${ARGV[0]}.filtered.xml" or die $!;

	my $skip = 0;
	while (my $line = <INPUT>) {

	yum -y install erlang perl perl-RRD-Simple.noarch perl-Log-Log4perl-RRDs.noarch gnuplot perl-Template-Toolkit firefox

	wget http://tsung.erlang-projects.org/dist/tsung-x.x.x.tar.gz

	tar zxfv tsung-1.4.2.tar.gz
	cd tsung-1.4.2
	./configure && make && make install

	cp /usr/share/doc/tsung/examples/http_simple.xml /root/.tsung/tsung.xml

	#!/bin/bash
	# To create in [.babun/]cygwin/usr/local/bin/subl with chmod +x

	ARGS=""
	while test $# -gt 0
	do
	ARGS="$ARGS ${1#/cygdrive/[a-zA-Z]}"; # Remove /cygdrive and disk letter from the path
	shift
	done