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This month
April 2008
March 2008
Linear Programming: Foundations and Extensions
by ogrisel
(via)
# Balanced treatment of the simplex method and interior-point methods.
# Efficient source code (in C) for all the algorithms presented in the text.
# Thorough discussion of several interior-point methods including primal-dual path-following, affine-scaling, and homogeneous self dual methods.
# Extensive coverage of applications including traditional topics such as network flows and game theory as well as less familiar ones such as structural optimization, L^1 regression, and the Markowitz portfolio optimization model.
# Over 200 class-tested exercises.
# A dynamically expanding collection of exercises.
Sponsorised links
February 2008
Simple SSE optimized sin, cos, log and exp
by ogrisel
I chose to write them in pure SSE1 MMX so that they run on the pentium III of your grand mother, and also on my brave athlon-xp, since thoses beast are not SSE2 aware. Intel AMath showed me that the performance gain for using SSE2 for that purpose was not large enough (10%) to consider providing an SSE2 version (but it can be done very quickly).
The functions use only the _mm_ intrinsics , there is no inline assembly in the code. Advantage: easier to debug, works out of the box on 64 bit setups, let the compiler choose what should be stored in a register, and what is stored in memory. Inconvenient: some versions of gcc 3.x are badly broken with certain intrinsic functions ( _mm_movehl_ps , _mm_cmpeq_ps etc). Mingw's gcc for example -- beware that the brokeness is dependent on the optimization level. A workaround is provided (inline asm replacement for the braindead intrinsics), it is not nice but robust, and broken compilers are detected by the validation program below.
January 2008
November 2007
SAP Memory analyzer
by Regis
SAP Memory Analyzer is a fast and feature-rich heap analyzer that helps you easily find big chunks of memory and identify who is keeping these objects alive.
The Memory Analyzer was developed to analyze productive heap dumps with hundreds of millions of objects. Once the heap dump is parsed, you can re-open it instantly, immediately get the retained size of single objects and quickly approximate the retained size of a set of objects. The Analyzer is (relatively) low on resource consumption, so you can analyze multi-GB heap dumps on 32 bit boxes.
October 2007
Web Page Analyzer - free website optimization tool website speed test check website performance report from web site optimization
by lukeslytalker
& 13 others
Try our free web site speed test to improve website performance. Enter a URL below to calculate page size, composition, and download time. The script calculates the size of individual elements and sums up each type of web page component.
August 2007
July 2007
Yslow
by Hiéroglyphe
& 15 others
YSlow analyzes web pages and tells you why they're slow based on the rules for high performance web sites. YSlow is a Firefox add-on integrated with the popular Firebug web development tool.
How To Speed Up Firefox
by decembre
& 1 other
There are a few tricks to speed up Firefox. Check them out below:
