Linux Blog

How to Measure the Throughput of a Network- Iperf

Iperf is a commonly used network testing tool for measuring maximum TCP and UDP bandwidth performance (throughput) of a network. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.

Iperf allows the user to set various parameters that can be used for testing a network, or alternately for optimizing or tuning a network. Iperf has a client and server functionality, and can measure the throughput between the two ends, either unidirectonally or bi-directionally. It is open source software and runs on various platforms including Linux, Unix and Windows.

Typical Iperf output contains a timestamped report of the amount of data transferred and the throughput measured. Iperf is significant as it is a cross-platform tool that can be run over any network and output standardized performance measurements. Thus it can be used for comparison of wired and wireless networking equipment and technologies in an unbiased way.

How to Create ISO-9660 CD-ROM filesystem images - genisoimage

genisoimage is a pre-mastering program to generate ISO9660/Joliet/HFS hybrid filesystems. genisoimage takes a snapshot of a given directory tree, and generates a binary image which will correspond to an ISO9660 and/or HFS filesystem when written to a block device.

Install genisoimage using command:

sudo apt-get install genisoimage

Scan for Potential Security flaws in source code - Graudit

Graudit is a little script and signature sets that allows you to find potential security flaws in source code using the GNU utility grep. It's comparable to other static analysis applications like RATS, SWAAT and flaw-finder while keeping the technical requirements to a minimum and being very flexible.

Graudit supports scanning code written in several languages; asp, jsp, perl, php and python.

Graudit Usage:
Graudit supports several options and tries to follow good shell practices. For a list of the options you can run graudit -h or see below. The simplest way to use graudit is;

Opensource Profiling and performance tunning for .Net Applications - SlimTune

SlimTune is a free profiler and performance analysis/tuning tool for .NET based applications, including C#, VB.NET, and more. It provides many powerful features, such as remote profiling, real time results, multiple plugin-based visualizations, and much more. The source code is available under the terms of the MIT License.

SlimTune is currently an early beta, but it is fully functional and considered ready for use in most cases. Both x86 and x64 targets are supported, but only sampling based profiling is available in the current release.

SlimTune Features
Live Profiling - Why should you have to wait until your program has ended to see results? SlimTune reports results almost immediately, while your code is still running. See your bottlenecks in real-time, not after the fact.

How to Upgrade Ubuntu Using an Alternate ISO Image

If your computer is not able to run the standard Desktop installation CD, you can use an Alternate installation CD instead. The Alternate CD also allows more advanced installation options which are not available with the Standard LiveCD.

To upgrade Ubuntu from an ISO file, you need the Alternate version CD, NOT the regular Ubuntu Desktop CD. Alternate CD ISO image file of any release can be found here: http://releases.ubuntu.com/.