TweetFollow Us on Twitter

Web Benchmarking 101

Volume Number: 22 (2006)
Issue Number: 4
Column Tag: Web Performance Testing

Web Benchmarking 101

A guide to stress testing your website with ApacheBench and JMeter

by Jin Lin and Emmanuel Stein


Web performance testing can be a daunting subject for the uninitiated. With the sheer number of tools available and their various feature sets, it can be hard to know where to begin. In this article we will explore the use of two popular open source tools, ApacheBench (aka ab) and JMeter, to perform simple benchmarking tests. Rather than going through the extensive feature set offered by these applications, particularly JMeter, we will focus on measuring the response time and the effective throughput of your web application across different user load scenarios. Whether serving a few static pages or a fully dynamic site, the tools discussed will offer invaluable insight into the overall performance of your web applications, and serve as a basis for isolating system bottlenecks and conducting capacity planning for your web applications.

Benchmarking Considerations

Although, the tests and tools that we will use in this article represent integral components used in the testing process, it is equally important to consider the environment in which such tests are performed. If you are running a popular website with significant traffic, you may consider performing benchmarks during non-peak hours to obtain more accurate results and avoid rendering your server unusable to users. If possible, you should test your web server in a staged environment and before actual deployment. This will enable you to adjust server parameters, install cache mechanisms, and otherwise assess your site's performance without interrupting service.


ApacheBench, a default component of the Apache Server distribution, is a simple command line tool, designed to measure the performance of Apache server. Preinstalled on Mac OS X, it is able to supply information such as elapsed time, requests per second, time per request, compression rate, transfer rate, and connection time under different concurrence scenarios.

Though not an exhaustive list (see the ab man page for more details), the following represents the most commonly used switches employed when testing typical usage scenarios with ab.

  • -n: Specifies the number of requests to perform for a given test. Use this option to measure the time required to process a given number of client requests. When used alone, without the -c option, ab does not process requests concurrently.

  • -t: Specifies a timeframe, in seconds, to spend benchmarking. This option is useful in determining the number of requests that your server is able to process in a given amount of time.

  • -c: Specifies number of simultaneous connections. Of use in testing how your server performs when multiple clients are hitting a given page at the same time. This switch may be used with either -n or -t, to measure the total elapsed time required to process a given number of client requests simultaneously, and the number of concurrent requests that may be processed over a set amount of time, respectively.

  • -g: Exports a TSV (Tab Separated Values) file, which can be imported into applications like Excel, GNUplot, and Mathematica for further analysis and/or graphic visualization.

  • -A: Used to supply username and password information for sites that require authentication. This enables you to conduct testing on password-protected sites.

Having covered some of the basic parameters of ab, we will now explore its use in the context of simple web benchmarking scenarios.

For our first example, we will be measuring the time it takes to process 1000 requests (i.e. -n 1000), from 10 simultaneous user connections (i.e. -c 10) against OS X's default user website. Make sure Apache is running by launching System Preferences and enabling personal web sharing from the sharing preference pane. Once Apache is running, launch the Terminal application and enter the following command: ab -n 1000 -c 10 http://localhost/~username to begin the benchmark. When the command is executed the terminal will display the progress of the benchmark run, as well as, a series of metrics (Figure 1).

Figure 1. Output of ab -n 1000 -c 10 http://localhost/~estein

Be aware that when you run the ab command against a domain or IP address the benchmark defaults to the site's home page; in this case, index.html. To specify a particular page, simply point to its full path (e.g. http://localhost/~estein/MyDynamicContent.php). This will allow you to test the performance of specific pages hosted by your site in terms of the amount of stress they each place on the server. This is particularly important when dealing with sites that have both static and dynamic content. When testing dynamic pages keep in mind that ab reports a failed request when it encounters content that changes over time (e.g. dynamic data). As such, when running ab against dynamic portions of your site, you can safely ignore the "failed requests" messages.

For our next example, we will be measuring the number of requests that can be completed within 60 seconds (-t 60) with 10 concurrent connections (-c 10). Enter the following command in the Terminal to execute this benchmark: ab -t 60 -c 10 http://localhost/~username The output of this command, seen in Figure 2, differs from the first example in that -n is not specified. When -n is not specified, ab sets the number of requests to a default value of 50,000. It is important to realize that, when using the -t switch, it is possible for the benchmark to complete, before the specified time period has elapsed, thus rendering the time variable irrelevant. Therefore, when using the -t and -n switches in tandem, it is important to consider whether your time variable exceeds the time it takes to process n requests.

Figure 2. Output of ab -t 60 -c 10 http://localhost/~estein


JMeter is a pure Java application, developed under the purview of the Apache Jakarta project, which offers a wide array of tools for benchmarking all manner of client-serverbased applications. JMeter's modular architecture allows it to simulate a variety of load scenarios across multiple servers, networks, and objects. For the purposes of this article, however, we will only be using a subset of JMeter's capabilities to perform basic load testing. For information on using JMeter to perform detailed performance measures on more complex web applications you may refer to the user guide at

Before we begin, it is instructive to go over the major architectural components that constitute JMeter.

  • Test Plan: Defines the test sequence that JMeter will carry out during benchmarking.

  • Thread Group: Used to delineate specific testing conditions, such as number of concurrent users, the Thread Group plays host to all other elements that comprise a test sequence.

  • Config Element: Responsible for defining configuration information for the Sampler and Logic Controller elements.

  • Sampler: A type of controller that designates both the protocol type and nature of requests within a given test plan.

  • Logic Controller: A controller element that determines the sequence logic used by JMeter to initiate protocol requests.

  • Timer: Used to manage the latency across queued user requests.

  • Listener: Responsible for recording and visualizing of test sequence data.

Getting Started

JMeter requires JDK 1.4 or higher to run properly. Type java -version in the Terminal application to discover which version of JDK is installed on your machine. Currently Apple supplies Java 1.3.1-1.4.2 Release 2 and J2SE 5.0 release 3 through regular software updates, as well as, at the following links:

In our tests, both JDK versions were able to run JMeter without a hitch. However, you will likely notice some performance improvement when using the J2SE 5.0 release 3. To specify this version as your system default or to change the precedence settings for your installed Java Virtual Machines (JVMs), use the Java Preferences utility located in /Applications/Utilities/Java/Java2SE 5.0.

The latest version of JMeter is available as a free download at Depending on your preferences, you can download the application as source code or binary as either .zip or .tgz archives. The easiest option for most OS X users will be to download the binary in zip format, which can be easily uncompressed in the GUI by double clicking the archive. The resulting jakarta-jmeter-2.1.1 folder can be placed in your Applications folder or other location within the filesystem. You can launch JMeter by either double clicking the ApacheJMeter.jar file, located in the bin directory of the Jakarta-jmeter-2.1.1 folder, or by executing the jmeter shell script located in the same directory. Please note, that if you wish to run jmeter from the command line you will need to make the script executable using the chmod command. For command line interactive use, please refer to the "Getting Started" section of the JMeter user manual:

Figure 3. JMeter's main window

JMeter in Action

In this example, we will create a test plan that simulates 10 users initiating simultaneous requests to 2 different URLs and which repeats the test 100 times. Begin with the addition of a new Thread Group by right clicking (or control clicking) the Test Plan element in the left pane and selecting Add >Thread Group. Next, select the Thread Group element to display its configuration window and set the Number of Threads to 10 (representing users), the Ramp-Up Period to 0 (to initiate all users at once), and the Loop Count to 100.

Figure 4. Configuring Thread Group element

To add the next element of our test plan, HTTP Request Defaults, right click on the Thread Group element, and select Add > Config Element > HTTP Request Defaults (Figure 5).

Figure 5. Add HTTP Request Defaults

Select the HTTP Request Defaults icon under Thread Group and enter a server name (e.g. localhost or FQDN) in the configuration window (Figure 6).

Figure 6. Configuring HTTP Request Defaults element

Right click on the Thread Group element and then select Add>Sampler>HTTP Request twice, to create two HTTP Request elements, one for each web page. The Name and Path fields for each of the HTTP Request elements should be set to appropriate values. For the purpose of this example, we will name the first HTTP Request element home, and set its path to ~username/index.html and name the second HTTP Request another and set its path to ~username/another.html (figure 7).

Figure 7. Configuring the "another" HTTP Request element

Now we need to add a timer to pause each request for a random period of time. Right click on the Thread Group and then select Add>Timer>Gaussian Random Time.

For the last element, we will add listeners by right clicking on the Thread Group element, then selecting Add>Listener>Aggregate Report. This particular listener lists, in tabular form, the response time, request count, min, max, average, error rate, and approximate number of request processes in seconds (e.g. Throughput), as well as, throughput in terms of Kilobytes per second. You may add additional listeners, such as Graph Results, View Results in Table, and View Results Tree, depending on your requirements.

To begin the test plan, simply select Run>Start from within the JMeter menu bar. You will be prompted to save the test plan, if you haven't already done so. During a successful run of your test plan, you may click on the Aggregate Report listener element (figure 8), or any other listener types you may have added, to view your dynamically updated test results. Figure 9, for example, demonstrates some of the graphing functions of JMeter's Graph Results listener element.

Figure 8. Aggregate Report listener view

Figure 9. Graph Results listener view


In this article, we employed both ab and JMeter to "stress test" a locally hosted site via simple load scenarios. The amount of time a server takes to respond to clients' requests across different load levels, is one of the most important metrics for evaluating web performance. Through the manipulation of load test variables, such as the number of concurrent requests, and with reference to tool-specific data visualization processes, we are better able to ascertain the extent to which these variables impact a server's maximum sustainable load. Such information is critical for proper website management, planning and eventual performance tuning.

Jin Lin and Emmanuel Stein are partners in the consulting firm MacVerse, Corp, which offers implementation, system administration, and development services geared towards the enterprise market. You may reach them at


Community Search:
MacTech Search:

Software Updates via MacUpdate

Warhammer 40,000: Freeblade guide - How...
Warhammer 40,000: Freebladejust launched in the App Store and it lets you live your childhood dream of blowing up and slashing a bunch of enemies as a massive, hulking Space Marine. It's not easy being a Space Marine though - and particularly if... | Read more »
Gopogo guide - How to bounce like the be...
Nitrome just launched a new game and, as to be expected, it's a lot of addictive fun. It's called Gopogo, and it challenges you to hoparound a bunch of platforms, avoiding enemies and picking up shiny stuff. It's not easy though - just like the... | Read more »
Sago Mini Superhero (Education)
Sago Mini Superhero 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: KAPOW! Jack the rabbit bursts into the sky as the Sago Mini Superhero! Fly with Jack as he lifts impossible weights,... | Read more »
Star Wars: Galaxy of Heroes guide - How...
Star Wars: Galaxy of Heroes is all about collecting heroes, powering them up, and using them together to defeat your foes. It's pretty straightforward stuff for the most part, but increasing your characters' stats can be a bit confusing because it... | Read more »
The best cooking apps (just in time for...
It’s that time of year again, where you’ll be gathering around the dinner table with your family and a huge feast in front of you. [Read more] | Read more »
Square Rave guide - How to grab those te...
Square Rave is an awesome little music-oriented puzzle game that smacks of games like Lumines, but with its own unique sense of gameplay. To help wrap your head around the game, keep the following tips and tricks in mind. [Read more] | Read more »
Snowboard Party 2 (Games)
Snowboard Party 2 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Crowned the best snowboarding game available on the market, Snowboard Party is back to fulfill all your adrenaline needs in... | Read more »
One Button Travel (Games)
One Button Travel 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: “To cut a long story short, If you like interactive fiction, just go buy this one.” - “Oozes the polish that... | Read more »
Light Apprentice Volume 1 (Games)
Light Apprentice Volume 1 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Light Apprentice Volume 1 includes Chapters 1 to 4, all gathered in a new exclusive game. When life in the world of... | Read more »
The best games like Animal Crossing on m...
Animal Crossing amiibo Festival is out right now for the Wii U, reminding us of just how much fun that world can be. Or at least to go back and check in on our villages once in a while. [Read more] | Read more »

Price Scanner via

iMobie Releases its Ace iOS Cleaner PhoneClea...
iMobie Inc. has announced the new update of PhoneClean 4, its iOS cleaner designed to reclaim wasted space on iPhone/iPad for use and keep the device fast. Alongside, iMobie hosts a 3-day giveaway of... Read more
U.S. Cellular Offering iPad Pro
U.S. Cellular today announced that it is offering the new iPad Pro with Wi-Fi + Cellular, featuring a 12.9-inch Retina display with 5.6 million pixels — the most ever in an iOS device. U.S. Cellular... Read more
Newegg Canada Unveils Black Friday Deals for...
Newegg Canada is offering more than 1,000 deep discounts to Canadian customers this Black Friday, available now through Cyber Monday, with new deals posted throughout the week. “Black Friday is... Read more
Black Friday: Macs on sale for up to $500 off...
BLACK FRIDAY B&H Photo has all new Macs on sale for up to $500 off MSRP as part of their early Black Friday sale including free shipping plus NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $... Read more
Black Friday: Up to $125 off iPad Air 2s at B...
BLACK FRIDAY Walmart has the 16GB iPad Air 2 WiFi on sale for $100 off MSRP on their online store. Choose free shipping or free local store pickup (if available): - 16GB iPad Air 2 WiFi: $399, save $... Read more
Black Friday: iPad mini 4s on sale for $100 o...
BLACK FRIDAY Best Buy has iPad mini 4s on sale for $100 off MSRP on their online store for Black Friday. Choose free shipping or free local store pickup (if available): - 16GB iPad mini 4 WiFi: $299.... Read more
Black Friday: Apple Watch for up to $100 off...
BLACK FRIDAY Apple resellers are offering discounts and bundles with the purchase of an Apple Watch this Black Friday. Below is a roundup of the deals being offered by authorized Watch resellers:... Read more
Black Friday: Target offers 6th Generation iP...
BLACK FRIDAY Save $40 to $60 on a 6th generation iPod touch at Target with free shipping or free local store pickup (if available). Sale prices for online orders only, in-store prices may vary: -... Read more
Black Friday: Walmart and Target offer iPod n...
BLACK FRIDAY Walmart has the 16GB iPod nano (various colors) on sale for $119.20 on their online store for a limited time. That’s $30 off MSRP. Choose free shipping or free local store pickup (if... Read more
Black Friday deals on the Apple Watch and App...
Apple resellers are offering discounts and bundles with the purchase of an Apple Watch this Black Friday weekend. Below is a roundup of the deals being offered by authorized Watch resellers: Apple... Read more

Jobs Board

Storefront Operations Coordinator, *Apple* -...
# Storefront Operations Coordinator, Apple -Latin America Job Number: 43587750 Miami, Florida, United States Posted: Oct. 16, 2015 Weekly Hours: 40.00 **Job Summary** The Read more
*Apple* Enterprise / Government Professional...
# Apple Enterprise / Gove ment Professional Services Engineer Job Number: 42292976 Reston, Virginia, United States Posted: Aug. 18, 2015 Weekly Hours: 40.00 **Job Read more
iOS Wallet & *Apple* Pay Engineer - App...
# iOS Wallet & Apple Pay Engineer Job Number: 40586801 Santa Clara Valley, Califo ia, United States Posted: Nov. 16, 2015 Weekly Hours: 40.00 **Job Summary** The iOS Read more
Software Engineer, *Apple* Watch - Clock Fa...
# Software Engineer, Apple Watch - Clock Face Team Job Number: 44368761 Santa Clara Valley, Califo ia, United States Posted: Nov. 14, 2015 Weekly Hours: 40.00 **Job Read more
Administrative Assistant, *Apple* Online St...
# Administrative Assistant, Apple Online Store Job Number: 43992352 Santa Clara Valley, Califo ia, United States Posted: Nov. 9, 2015 Weekly Hours: 40.00 **Job Summary** Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.