PerformanceEngineer.com » Tips & Tricks

Extract Transaction Data From LoadRunner Analysis

charlie — Sun, 15 Jun 2008 19:38:27 +0000

I had a need to extract transaction response time data from a bunch of LoadRunner Analysis files, and I really didn’t want to do endless cut and paste operations from within the LoadRunner Analysis tool. I created this Python script to extract transaction response time data from the LoadRunner Analysis mdb file and output [...]

Customize size of images in LoadRunner HTML reports

charlie — Fri, 30 May 2008 01:57:33 +0000

Quick tip: With prevalence of larger monitors these days, it is nice to have charts and graphs that take advantage of the extra space. If you want to customize the size of the charts in the LoadRunner HTML reports, change these settings in C:\Program Files\Mercury\LoadRunner\bin\dat\GeneralSettings.txt: [HTML report] ChartWidth=1024 ChartHeight=576

Adding dates to vmstat logs

charlie — Wed, 23 Apr 2008 15:07:52 +0000

One of the problems I have with vmstat is that it doesn't have the option to output timestamps (the way iostat does). As a result, if you have vmstat logs and you don't know exactly when it was run or at what interval it was collecting data, then it makes the data less meaningful or makes it a hassle to track down the information. It is easy enough to add the date, using a simple shell script. Create a file, add_date.sh, containing the following:

#!/bin/bash

while read data; do
        echo `date '+%m/%d/%Y %H:%M:%S'` $data
done

Java Memory Leaks

charlie — Fri, 18 Apr 2008 03:20:53 +0000

Finding (and fixing) memory leaks in java can sometimes be a tricky process. I recently had to do some analysis on a leaking application and hit a snag. My game plan was to do the following:

Capture heap dumps with jmap
Analyze dump with jhat

Along the way, I ran into a problem with jmap and discovered a couple new tools.

Regular Expressions in LoadRunner

charlie — Wed, 16 Apr 2008 03:24:03 +0000

Dmitry Motevich posted a challenge for getting regular expressions working in LoadRunner. Regular expressions in C isn't pretty, but here it is:

Edit LoadRunner scripts in Eclipse

charlie — Fri, 06 Jul 2007 03:25:10 +0000

LoadRunner Vugen can hardly be described as a true IDE, since it is missing a lot of features you would expect, such as: outline of functions, search for references and declarations, code formatting, etc.

It is possible to edit scripts using a real IDE (e.g. Eclipse) with some significant advantages and disadvantages. Here's how...

LoadRunner: Anatomy of a Script

charlie — Wed, 28 Mar 2007 03:32:46 +0000

When you record and save a LoadRunner script in Vugen, there are a number of files that are created. Here's what they are, and what they do and identification of the files you can safely delete..

LoadRunner: Creating a custom dll

charlie — Mon, 19 Mar 2007 01:30:48 +0000

Using LoadRunner's lr_load_dll() function, it is possible to roll your own dll's and use custom functions in your LoadRunner scripts. Here's how.