Big-O Algorithm Complexity Cheat Sheet (Know Thy Complexities!) @ericdrowell
Hi there! This webpage covers the space and time Big-O complexities of common algorithms used in Computer Science. When preparing for technical interviews in the past, I found myself spending hours crawling the internet putting together the best, average, and worst case complexities for search and sorting algorithms so that I wouldn't be stumped when asked about them. Over the last few years, I
Munin Monitoring
What is Munin? Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work. In Norse mythology Hugin and Munin are the ravens of the god king Odin. They flew all over Midgard for him, seeing and remembering,
You’re Doing It Wrong - ACM Queue
The Bike Shed June 11, 2010 Volume 8, issue 6 PDF You're Doing It Wrong Think you've mastered the art of server performance? Think again. Poul-Henning Kamp Would you believe me if I claimed that an algorithm that has been on the books as "optimal" for 46 years, which has been analyzed in excruciating detail by geniuses like Knuth and taught in all computer science courses in the world, can be opti
ReferenceProperty prefetching in App Engine - Nick's Blog
Posted by Nick Johnson | Filed under python, tech, app-engine, cookbook, coding This post is a brief interlude in the webapps on App Engine series. Fear not, it'll be back! Frequently, we need to do a datastore query for a set of records, then do something with a property referenced by each of those records. For example, supposing we are writing a blogging system, and we want to display a list of
Yahoo! Smush.it™
Smush.it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality. After Smush.it runs on a web page it reports how many bytes would be saved by optimizing the page's images and provides a downloadable zip file with the minimized image files. Do not
Linux performance basics
I want to write about Cassandra performance tuning, but first I need to cover some basics: how to use vmstat, iostat, and top to understand what part of your system is the bottleneck -- not just for Cassandra but for any system. vmstat You will typically run vmstat with "vmstat sampling-period", e.g., "vmstat 5." The output looks like this: procs -----------memory---------- ---swap-- -----io---- -
Video: John Resig — Testing, Performance Analysis, and jQuery 1.4 (YUI Theater)
Video: John Resig — Testing, Performance Analysis, and jQuery 1.4 Video published 2009-12-14. Download iPhone/iPod-compatible video file (320x240, .m4v) Slides Transcript: John Resig: I really appreciate you having me here. I wanted to talk about a few different topics today, all things I'm thinking about at the moment and working on. I wanted to talk a little bit about JavaScript testing, I wante
MySQL
MySQL HeatWave MySQL HeatWave is a fully managed database service for transactions, real- time analytics across data warehouses and data lakes, and machine learning services, without the complexity, latency, and cost of ETL duplication. It is available on OCI, AWS, and Azure. Learn More » MySQL Enterprise Edition The most comprehensive set of advanced features, management tools and technical suppo
Tornado Web Server — Tornado 6.4 documentation
¶ Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user. Quick links¶ Current version: 6.4 (download from PyPI, release notes) Source
Finding and fixing memory leaks in Python - amix blog
Finding and fixing memory leaks can be a real challenge, but luckily Python has some pretty good tools for spotting these things. I have already written about this issue and this post will go into more details on how to spot and debug a memory leak in MySQLdb, which is the standard Python wrapper for MySQL.Introducing Dozer Dozer is a WSGI middleware that displays sparklines of Python object count
Google Code Blog: Introducing Page Speed
At Google, we focus constantly on speed; we believe that making our websites load and display faster improves the user's experience and helps them become more productive. Today, we want to share with the web community some of the best practices we've used and developed over the years, by open-sourcing Page Speed. Page Speed is a tool we've been using internally to improve the performance of our we
Django tip: Caching and two-phased template rendering | Holovaty.com
We've launched user accounts at EveryBlock, and we faced the interesting problem of needing to cache entire pages except for the "You're logged in as [username]" bit at the top of the page. For example, the Chicago homepage takes a nontrivial amount of time to generate and doesn't change often -- which means we want to cache it -- but at the same time, we need to display the dynamic bit in the upp
TaskSpeed - Library Task Test Suite
TaskSlickSpeed basic task test for frameworks. This is not SlickSpeed, though uses the same framework. Tests are run against a local copy of this document. They add, remove, append, connect and otherwise mangle the DOM as defined by the sample-tests.js file. These results are [optionally] reported back. There are Charts being generated from this data selectors jQuery 1.2.6Dojo 1.2.3jQuery 1.3.2Pr
Project Voldemort
Voldemort is a distributed key-value storage system Data is automatically replicated over multiple servers. Data is automatically partitioned so each server contains only a subset of the total data Server failure is handled transparently Pluggable serialization is supported to allow rich keys and values including lists and tuples with named fields, as well as to integrate with common serialization
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Diagnose and Prevent AJAX Performance Issues - dynaTrace software
Google Code Archive - Long-term storage for Google Code Project Hosting.
Percona Toolkit
cmemcache — Roidelapatate
Google Code Archive - Long-term storage for Google Code Project Hosting.
Google Code Archive - Long-term storage for Google Code Project Hosting.