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Showing posts tagged “Apache”

IE 11 Support Added in Latest Load Tester 5.5 patch

Earlier last month, Microsoft began rolling out IE 11 updates for Windows 7 users. Now, with the most recent release of Load Tester 5.5, you can rest assured that Load Tester will continue to allow you to record your testcases using the upgraded IE 11.
IE 11 includes a number of new enhancements (many of which are reserved for Windows 8.1 customers). However, on Windows 7, users can still benefit from improved performance and standards support.
One of the interesting modifications of note is a new change to IE’s user agent header. Starting with IE 11, the browser … Continue reading »

Google Pagespeed 1.1 Performance with PHP

For the past week I’ve been testing out the performance of the new Google Pagespeed module for Apache, mod_pagespeed, and with the memory locking option turned on, the performance was a definite improvement for static pages. The fact is, though, there are much faster web servers for static content, and CDNs make scaling static pages very, every easy. Standard testing procedure, though, is to start as simple as possible, and test every variation separately. The next step, then is to test how Pagespeed works on dynamic pages.
As before, this new test uses our own corporate … Continue reading »

The Fastest Webserver?

Looking for the snappiest, fastest web server software available on this here internet?  So were we.  Valid, independent, non-synthetic benchmarks can be difficult to find.  Of course, we all know that benchmarks don’t tell us everything we need to know about real-world performance; but what’s the fun of having choices if we can’t pick the best?
Exactly.  I decided to do a little research project of my own.
Test Plan
I selected for this exercise recent (as of October 2011) versions of Apache, Nginx, Lighttpd, G-WAN, and IIS — a list that includes the most popular web servers as well as web servers … Continue reading »

Internet Explorer Static File Caching Defect

In going through cases we have with some customers, we’ve seen a few instances where Internet Explorer does not cache shared static resources. Within Load Tester, this problem becomes immediately apparent:

Note that the shared CSS, Javascript, and images are re-requested again on the About page and every other recorded page that uses them. Note also, these files don’t come back with a 304 (Not Modified), but instead the full content of the file is sent over and over again through a HTTP 200. Normally, the browser should load these files once, and not need to request them again within the … Continue reading »

Load Testing Back to Basics: Avoiding the KeepAliveTimeout Race Condition

You’ve recorded your test case, configured your datasets, and run your replays.  You start up the load test and … you see numerous errors like this:
“The connection with the server was unexpectedly closed before starting the response.”
What’s going on?  Well, one common reason for this error is a connection-related race condition between Load Tester and the web server due to the server’s configured persistent connection timeout.
Persistent connections are an HTTP mechanism for minimizing network connection overhead between the browser and the web server.  If the client has the Connection request header set to Keep-Alive, and the server responds with the … Continue reading »

Measuring the Performance Effects of mod_deflate in Apache 2.2

Enabling mod_deflate can reduce the bandwidth usage on a particular file by up to 70%, but also reduces the maximum load a server can handle and may actually reduce site performance if the site compresses large dynamic files. Read the full report for a complete analysis.

Tomcat Performance Best on Linux

Durham, N.C. (PRWEB) – Web Performance, Inc. announces the release of two articles describing how the performance of the popular open source application server Tomcat differs on Windows and Linux.

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