"A tool for exploring a docker image, layer contents, and discovering ways to shrink your Docker image size.

"

The MariaDB Corporation MaxScale is an intelligent proxy that allows forwarding of database statements to one or more database servers using complex rules, a semantic understanding of the database statements and the roles of the various servers within the backend cluster of databases.

MaxScale is designed to provide load balancing and high availability functionality transparently to the applications. In addition it provides a highly scalable and flexibile architecture, with plugin components to support different protocols and routing decissions.

"Helps front-end developers to reach a good quality and good performances, based on phantomas and grunt-phantomas.

Day after day, while working on your project, keep an eye on performance metrics and get warnings for things you should optimize."

"grunt-perfbudget is a Grunt.js task for enforcing a performance budget (more on performance budgets). It uses the wonderful webpagetest.org and the WebPagetest API Wrapper for NodeJS created by Marcel Duran.

grunt-perfbudget uses either a public or private instance of WebPagetest to perform tests on a specified URL. It compares test results to budgets you specify. If the budget is met, the tasks successfully completes. If it the page exceeds your performance budgets, the task fails and informs you why."

"PHP cache slam defense using (memcached) semaphore to prevent dogpile effect (aka clobbering updates, stampending herd or Slashdot effect).

Problem: too many requests hit your website at the same time to regenerate same content slamming your database. It might happen after the cache was expired.

Solution: first request generates new content while all the subsequent requests get (stale) content from cache until it's refreshed by the first request."

" Code Issues 3 Pull Requests 0 Wiki Pulse Graphs Network SSH clone URL

You can clone with HTTPS, SSH, or Subversion.

Download ZIP InstantClick makes following links in your website instant."

"Sitespeed.io is an open source tool that helps you analyze your website speed and performance based on performance best practices and metrics. It collects data from multiple pages on your website, analyze the pages using the rules and output the result as HTML or JUnit XML.

You can analyze one site, analyze & compare multiple sites or let it run in you CI tool to make sure that your site is always built the best way for speed."

To that end Aesop consists of three main functions and goals:

Pre-compile and package HPHP - The idea here is simple. To get us up and running as quickly as possible I’ve packaged the HPHP binaries in the full download version of Aesop. This means we no longer have to worry about compiling HPHP, which saves time and possible headache. We needn’t use this version though, we can still download a minimal, Aesop only version complete with full source code.

Compile – Compiling HPHP applications from the command line means well, using a command line, setting environmental variables, and so on. Thus, we remove this burden and instead focus on making sure our code-base is acceptable to HPHP.

Aesop builds the file lists HPHP requires for code-compilation, sets environment variables, displays errors, and also manages the results of HPHP for the other main function of Aesop…

Manage Servers – Compiling code is only half the story. Once compiled HPHP has literally created a server-in-a-box for us. It’s a single executable that contains your source converted to C++, a web server, and the full PHP run-time. Aesop manages these executable for us in a nice list format, allowing us to start, stop and delete them at will. Of course setting their properties using GUI controls or a more advanced interface to a so-called HDF file is included as well.

Graphic stand-alone administration for memcached to monitor and debug purpose This program allows to see in real-time (top-like) or from the start of the server, stats for get, set, delete, increment, decrement, evictions, reclaimed, cas command, as well as server stats (network, items, server version) with googlecharts

You can go further to see each server slabs, occupation, memory wasted and items (key & value).

"boomerang is a piece of javascript that you add to your web pages, where it measures the performance of your website from your end user's point of view. It has the ability to send this data back to your server for further analysis. With boomerang, you find out exactly how fast your users think your site is.

boomerang is opensource and released under the BSD license, and we have a whole bunch of documentation about it. "

Silverline is a lightweight, application-centric virtualization solution for Linux and Windows that enables you to systematically monitor and control all your disparate applications and workloads in both cloud and physical data center environments. Through Silverline's monitoring and workload management you can:

Consolidate different applications on the same shared machines, increasing overall resource utilization and reducing total cost of ownership (TCO). Guarantee service level agreements (SLAs) for consolidated applications by ensuring that specified minimum resource allocations are dedicated to each application. Improve machine utilization by dynamically sharing out unused resources to applications that can benefit from additional capacity. Provide fine-grained tracking of machine utilization to accurately understand which of your customers impact your infrastructure the most and bill business unit customers for IT-managed resources.

Apdex is a numerical measure of user satisfaction with the performance of enterprise applications. It converts many measurements into one number on a uniform scale of 0-to-1 (0 = no users satisfied, 1 = all users satisfied). This metric can be applied to any source of end-user performance measurements. If you have a measurement tool that gathers timing data similar to what a motivated end-user could gather with a stopwatch, then you can use this metric. Apdex fills the gap between timing data and insight by specifying a uniform way to measure and report on the user experience.

The index translates many individual response times, measured at the user-task level, into a single number. A Task is an individual interaction with the system, within a larger process. Task response time is defined as the elapsed time between when a user does something (mouse click, hits enter or return, etc) and when the system (client, network, servers) responds such that the user can proceed with the process. This is the time during which the human is waiting for the system. These individual waiting periods are what define the "responsiveness" of the application to the user.

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase. OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating systems, applications) at a large scale, and make this data easily accessible and graphable. Thanks to HBase's scalability, OpenTSDB allows you to collect many thousands of metrics from thousands of hosts and applications, at a high rate (every few seconds). OpenTSDB will never delete or downsample data and can easily store billions of data points. As a matter of fact, StumbleUpon uses it to keep track of hundred of thousands of time series and collects over 100 million data points per day in their main production cluster.

Imagine having the ability to quickly plot a graph showing the number of active worker threads in your web servers, the number of threads used by your database, and correlate this with your service's latency (example below). OpenTSDB makes generating such graphs on the fly a trivial operation, while manipulating millions of data point for very fine grained, real-time monitoring.