Electronics

Basic Electronics – 1

Posted on

Introduction Electronic component can be divided into 2 types: Active and Passive components Resistors and Capacitors etc. are known as passive components because they can only attenuate the electrical voltage and signals and cannot amplify. Devices like transistors and operational amplifier(op Amps)can amplify or increase the amplitude and energy associated with the signals and so are […]

Software Testing

Solving software performance problems

Posted on

How to solve software performance problems ? 1.  Define your Objective -where you need to be? It is surprising that many projects do not have well-defined performance objectives. When we ask what the performance objectives are, we very often get a response like “as fast as possible.” An objective such as this is not useful […]

How-To

Compiling and Installing Custom Linux Kernel

Posted on

Compiling and Installing Custom Linux Kernel The below mentioned steps will work in Ubuntu or debian like systems. I have tested it on Ubuntu 10.10. Download and unzip(preparing) sudo apt-get update sudo apt-get install kernel-package libncurses5-dev fakeroot wget bzip2 Download the kernel sources and unzip as shown below. sudo tar xjf linux-2.6.18.1.tar.bz2sudo ln -s linux-2.6.18.1 […]

How-To

No Sound from Ubuntu linux or Mint

Posted on

No Sound from Ubuntu linux or Mint Searched google for possible answer to the problem but solution mentioned was not sufficient to solve my issues. I wasted couple of weekends resolving this issue.Finally I solved by removing PulseAudio and ALSA packages and installing OSS(Open Sound System) What is OSS?OSS provides low -level audio drivers for […]

Software Testing

Statistical Principals for the Performance Tester

Posted on

Over the years I found that members of software development teams, developers, testers, administrators and managers alike have an insufficient grasp on how to apply mathematics or interpret statistical data on the job. As performance testers, we must know and be able to apply certain mathematical and statistical concepts. Exemplar Data Sets This section refers […]

Software Testing

Economics of test automation

Posted on

How to calculate the cost of test automation: Cost of test automation = Cost of tool(s) + Labor costs of script creation + Labor costs of script maintenance   If a test script will be run every week for the next two years, automate the test if the cost of automation is less than the […]

Software Testing

Monitoring Windows server using Nagios

Posted on

Monitoring windows server require installation on NSClient ++ on windows host. How it works? For example disk space usage needs to be monitored on windows host. 1. Nagios will execute check_nt command on nagios-server and request it to monitor disk usage on windows machine. 2. Check_nt on nagios-server will contact the NSClient++ service on remote windows host […]