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Showing posts tagged “caching”

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 »

Drupal: Caching and Database Scalability

Note: This is Part 4 of an ongoing series on Drupal performance and load testing. If you haven’t already, read the introduction.
Summary
We measured Drupal’s performance with respect to database size, demonstrating flat performance regardless of the size of the database.  We also got some good data demonstrating Drupal’s behavior with caching.
Procedure
We re-created our previous test platform: a stock Drupal installation on an Amazon Elastic Cloud m1.large instance with both the Alternative PHP Cache (APC) and Drupal’s built-in caching capabilities.  In this test, however, instead of scaling the number of simultaneous users, we instead held the test at 400 … Continue reading »

Optimizing Drupal: From Baseline Drupal to the Pantheon Drupal Platform

Note: This is Part 2 of an ongoing series on Drupal performance and load testing. If you haven’t already, read the introduction.
Summary
We measured Drupal’s performance with a naive and recommended configuration, and again using the Pantheon Drupal Platform, demonstrating a better than 15x improvement in performance.
Procedure
We created a Drupal installation on the Amazon Elastic Cloud, which allows us to start and customize Drupal in a matter of minutes.  For these tests we used Amazon’s “Large” 64bit instance, which corresponds roughly to a dual-core machine with 7.5 GB of memory.
Our baseline platform consisted of a stock Fedora Core 8 with … Continue reading »

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