TCP Optimizer Free program for Windows designed to optimize your internet connection. Go Programs and Apps. Here are links to some of the code people have written in Go so far, for libraries see the list of libraries written in Go and for Go. GPX, the GPS Exchange Format, is supported by hundreds of software applications and Web sites, making it the standard format for interchanging GPS data between GPS. Optimization of Computer Programs in C. Optimization of Computer Programs in C. Michael E. Lee. Senior ProgrammerAnalyst. D0%92%D1%8B%D0%B1%D0%BE%D1%80-%D1%81%D0%BA%D0%BE%D1%80%D0%BE%D1%81%D1%82%D0%B8-%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D0%BD%D0%B5%D1%82%D0%B0-%D0%B2-TCP-Optimizer1.png' alt='Programs Like Tcp Optimizer' title='Programs Like Tcp Optimizer' />
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Ontek Corporation. Mill Creek Road. Laguna Hills, CA 9. USA. Abstract A substantial portion of a knowledge workers life may. Users and organizations control their wait time by purchasing. Developers of application programs have a responsibility to design their. This document describes techniques for optimizing improving the speed. C. It focuses on minimizing time. CPU and gives sample source code transformations that. Memory and IO speed improvements are. CONTENTS. Contents. Introduction. Compute bound. Choose a Better Algorithm. Write Clear, Simple Code. Perspective. Understand your Compiler Options. Inlining. Loop Unrolling. Loop Jamming. Loop Inversion. Strength Reduction. Loop Invariant Computations. Code for Common Case. Tail Recursion Elimination. Table Lookup. Sorting. Variables. Function Calls. Digestibility. String Operations. FP Parallelism. Get a Better Compiler. Stack Usage. Code it in Assembly. Shared Library Overhead. Machine Specific Optimization. Memory bound. Locality of Reference. Column major Accessing. Dont Copy Large Things. Split or Merge Arrays. Reduce Padding. Increase Padding. March Forward. Beware the Power of Two. Memory Leaks. Be Stringy. Hinting. Fix the Problem in Hardware. Cache Profilers. IO bound. Sequential Access. Random Access. Terminals. Sockets. SFIOGotchas. Glossary. References. Acknowledgements. INTRODUCTION. The single most effective optimization technique is to use a profiler to. Its often difficult to guess what part. Once you have identified a bottleneck, for example a loop that is executed. This is more effective than making the loop run 1. Optimization is simply waste of programmer time if any of. Also take into account how the program will be used. If its a. report generator program which only needs to be run once a day, the user. If its being invoked from. But if it handles mouse tracking events for a GUI. Given that optimizing is reasonable, compile in full optimize mode and run. If you dont have access to real. Use the time1 command to see if your program is compute bound, memory. IO bound, or for that matter if its bound at all even if your. CPU time. You may have more time commands on your system than you. Sun. OS csh for example and. You can also get performance information from. COMPUTE BOUND. Recompile your program with profiling enabled and whatever optimization. Run your program, again on real world. Figure out which function uses. CPU time, then look it over very carefully and see if any of. Make one change at a time, then run the. The first four are quite important the rest are in no particular. CHOOSE A BETTER ALGORITHM. Think about what the code is really doing. Become familiar with the. You should be familiar with On notation, which is defined. Some of the obvious replacements. Also choose an appropriate data structure. If youll be doing a lot. If youll be doing some binary searching, an array would be. WRITE CLEAR, SIMPLE CODE. Some of the very things that make code clear and readable to humans. Complicated expressions. Ive seen one compiler that has. Part of the clarity is making hunks of code into functions when. The cost of a function call is extremely small on modern. NOT a valid excuse for writing ten page. If you write clean, portable code you can quickly port to the. Get a sense for how long certain operations take. Among the the. slowest are opening a file, reading or writing significant amounts of. The fastest. operations are basic elements of the language like assigning to a. None of. these operations take very long in and of themselves a few. If you perform even the fastest operation 1. In real. programs, various things happen various numbers of times and having. A sure sign of misunderstanding is this fragment. The intent is to save time by not initializing x if its already. In reality, the test to see whether its zero or not will take. For the intrepid hacker, there is no substitute for examining the. If you do this, dont forget to include wait states in. Also keep in mind that some optimization and instruction. I have a small, fairly portable program that prints out the. C operators and. library functions, speed. Its not. a benchmark the measurements are not weighted or averaged in. C. Note a I have no anonymous ftp server. Be sure to compile it with optimization off. Most of the code is trivial and would be eliminated by an optimizer. UNDERSTAND YOUR COMPILER OPTIONS. Most compilers have several levels of optimization. Make sure youre. One popular compiler, gcc, has an incredible. Some compilers have. High levels of optimization can make poorly written but compilable. Less often, optimizers mangle perfectly correct code. Problems with side effects and evaluation order tend to screw things. Signal handlers activated at inopportune times may. K R C compilers that Ive seen wont do it at all or will only do it. C compilers almost universally support inline. If necessary, C functions can be recoded as macros to obtain similar. This should be done. All debuggers Ive seen are. An example of inlining via macros. The extra parentheses are necessary to preserve grouping in case. Comma expressions and. The. do while macros. The opposite is true for macros using comma expressions. Gratuitously making every function in sight into a macro leads to. The larger a program is, the less likely it is to. Macros in C evaluate their arguments each time the argument is. If the actual argument passed to the. CPU time. Performing multiple. Because these macros can contain complicated statements. Also. dont forget that theres a limit on how many characters a macro can. Profilers dont see macros so its hard to optimize any further. Many compilers e. This way the test for i lt 1. Loop unrolling. works best when the loop is executed a fixed non prime number of times. If dostuff didnt make use of. Re arranging the. If the loop. only went to, say, five rather than 1. For computations which converge on some result, compilers will often. If the application is not sensitive to excess precision you. This is especially useful if the test for. An unrolled loop is larger than the rolled version and so may no. This will make the unrolled version slower. Also, in this example. If you happen to be using a vectorizing compiler, loop unrolling can. The idea is to combine adjacent loops which loop over the same range. Assuming nothing in the second loop indexes. MAX i initialize 2d array to 0s. MAX j. aij 0. MAX i put 1s along the diagonal. MAX i. for j 0 j lt MAX j. And now the incrementing and testing of i is done only. Under some circumstances, locality of reference may be. The example above was lifted. Aho Ullman. Some machines have a special instruction for decrement and compare. Assuming the loop is insensitive to direction, try this. MAX i. while i. Though watch out for problems with lookahead caches as noted below in. MARCH FORWARD. If you plan on doing this in combination with pointer. ANSI C has a special rule that allows you. STRENGTH REDUCTION. Strength reduction is the replacement of an expression by a different. Many. compilers will do this for you automatically. The classic examples. MAX i. h 1. MAX i. Also note that array indexing in C is basically a multiply and an. The multiply part can be subjected to strength reduction under. LOOP INVARIANT COMPUTATIONS. Go Programs and Apps. Here are links to some of the code people have written in Go so far, for libraries see the list of libraries written in Go and for Go programming tools see the Go utils page. DistributedGrid Computingmalus A Kademlia compatible DHTDistributed Hash Table written in Go by Michael Meier. Cloud Backups Small Go utilities to backup data from the cloud, to the cloud. By Yves Junqueira. Tonika A distributed framework for building secure social networks. By Petar Maymounkov. A lockservice in Go. By Blake Mizerany and Keith Rarick. A HPC cluster management tool. By Ron Minnich, Noah Evans, Jason Dreisbach, and John Floren. SSH client modeled after Plan 9s cpu1 command. By Taru Karttunen. Distributed services framework. By Brian Ketelsen. Termite Generic distributed compilation system. By Han Wen Nienhuys. Orchestra System for managing the reliable execution of tasks over a number of hosts. By Anchor. noeqd Fault tolerant network service for GUID generation. By Blake Mizerany at Heroku. Databases and Structured Storagediskv Disk backed key value store. By Peter Bourgon. Implementation of Riaks Bitcask key value store. By Andr Moraes. DBGo Light weight relational database engine. By Houzuo Guo. cbfs Distributed Blobstore using Couchbase Server. By Couchbase Labs. No. SQL database using JSON for document storage and queries. By Huozuo Guo. Gamesamberfell Steampunk Minecraft like game. By Ian Davis. Gongo A program written in Go that plays Go. By Brian Slesinsky. A rogue like game using SDL by Risto Saarelma. Flex. Bot A flexible bot for the Spring RTS engine implementing the lobby protocol. By Marcel Hauf. http gist. A simple game of Pong. By Michael Fellingerat. A shooter game based on Raptor. By Michael Fellingerat. Tetris Depends on the latest Go SDL. By nsf. a. Bridge Webapp to analyze bridge bidding, a demo installation can be found here. By David Roundy. Apollo Prototype Go based game using websockets and HTML5 Canvas. By Jason Del Ponte. A Go backend for Rumpetroll. By Andrew Gerrand. Minecraft. Chunky Monkey A multiplayer server for Minecraft Alpha. By Stefan Hajnoczi updated by Huin. Minecraft server wrappermod that acts as a Twitter gateway. By Yves Junqueira. Emulatorsgospeccy A ZX Spectrum Emulator with an SDL backend. By Andrea Fazzi. gb Minimalist Gameboy emulator. By aiju. Musicgoplayer Web based music player. By Andrew Gerrand. A client interface for the MPD Music Player Daemon, by fshahriar. Sleeping https github. MPD like music player daemon. By Viacheslav Chumushuk. Caches. Virtual Machines and Languages. Go. Lightly A flexible and lightweight virtual machine with runtime configurable instruction set. By Eleanor Mc. Hugh. Ruby. Go. Lightly An experimental port of Tiny. Rb to Go by Eleanor Mc. Hugh. brainfuck A brainfuck virtual machine in Go by yiyus. An experimental Post. Script like scripting language. By Jim Teeuwen. Tinyscript Post. Script like language interpreter. By Jim Teeuwen. gotcl Tcl like language interpreter designed for embedding. By Kyle Consalus aka consalus. Lispsschemes. golisp Primitive lisp dialect implemented in Go. By Bob Appleyard. Another simple Lisp implementaiton in Go. By westhood. kakapo Embedded Lisp Interpreter. By Scott Lawrence. GONE http github. Scheme implementation in Go. By Chris Lloyd. droscheme Another Scheme implementation. By Andrew Robbins. Gelo A Go extension language. By James Frasche. Small concatenative scripting language with a Syntax that is a mix of Go and Factor. By jimt. Forth. ngaro A ngaro virtual machine to run retro. Forth images by yiyus. Go. Forth A simple Forth parser. By Artem Titoulenko. Another Forth VM in Go. By unixdj. HTTP Servers and Toolstwister An HTTP server and web framework, including OAuth support. By Gary Burd. rest. RESTful HTTP server and client. By Nathan Kerr. go rproxy Basic reverse HTTP proxy. By Corey Thomasson. TCP tunneling over HTTP. By nf. http gonsole A simple and intuitive HTTP console. Depends on go readline. By mattn. gb HTTP benchmarking and stress testing tool modeled after Apache Benchmark. By Paulo Suzart. Optimus Cache Prime 2 Smart cache preloader for websites with XML sitemaps. By Patrick Mylund Nielsen. Simple, fast, and flexible web font server. By Robert Dinu. file. Spray a line oriented file at an HTTP endpoint. By bitly. goresize An image resizing proxy. By Arnaud Le Blanc. Web Appsgoplot A graphing utility with some curve fitting features, includes a web interface. Web app to graphical visualization of twitter timelines using the HTML5 lt canvas tag by Anthony Starks aka ajstarksgoals calendar A web based Seinfeld calendar implemented in Go. By Bruno Michel. Go. URLShortener A frontend for the http is. URL shortener by Nick Presta. A simple wiki in Go using web. By Andrew Gerrand. A php like web framework that allows embedding Go code in web pages. By Abiola Ibrahim. A web image gallery. Mathieu Lonjaret. A web app that displays photos from recent tweets. By Gary Burd. gopaste http github. Currently unavailable The code that runs the gopaste. By Alex Suraci. bloggo A lightweight blogging engine. Beijing Express Email Address Extractor Outlook here. By Brian Ketelsen. Blosxom like blog server, using web. By Yasuhiro Matsumoto. Static website generator using Gos standard template system. By William Roe. Blogging Enginesfettemama Blog system with a telnet interface. By Leon Szpilewski. Simple blog system with a CRUD interface, using web. By The. Only. 92. How To Install Cgi Proxy. Light Weight Blogging, a siple blogging platform. By Steve Lacey. Clients for Web Appskontl Client for the URL shortening service kon. By Jim Geovedi. wu Fast command line weather app that uses the Weather Underground API. By Stephen Ramsay. Web Toolsgocrawl Polite, slim and concurrent web crawler. By Martin Angers. P2. P and File Sharinggobit Bittorrent Client in Go by jessta. Taipei Torrent Another BT client. By jackpal. Taipei Torrent More uptodate fork of Taipei Torrent. By Yves Junqueira. A simple p. 2p app to learn Go, by nacmartin. Donkey. 20. 00 link crawler by Kevin Watt. A simple Bit. Torrent client based in part on the Taipei Torrent and gobit code. By Roger Pau Monn. IRCgo bot aka rndbot An irc bot that executes Go code sent to it and print its output, by Gracenotes. You can play with it in the go run channel in irc. A standards compliant irc daemon in Go. By kylelemons. rbot IRC bot based on the ideas of MPU and the code of goirc. By raylu. hatcog IRC client for tmux addicts. By Graham King. Networking Tools and Serversgrong Small authoritative DNS name server by Stphane Bortzmeyer aka bortzmeyernetsnail A low bandwidth simulator by Per Arneng. Gopher server written in Go. By Samuel Alexander Baldwin. Squid authenticator that consults multiple sources. By Jos Dinuncio. Collection of download tools that tries to follow the Unix philosophy. By Exiquio Cooper Anderson. RRD Round Robin Database statistics collector in Go. By Dmytro Shteflyuk. Package for throttling application IO such as bandwidth. By Evan Farrer. Emaildeliverd Simple SMTP server. By Sam Thorogood. An experimental multi node ESMTP server. By Gary Sims. Graphics and 3. DArclight Arclight is a tool for rendering images, for more details see this blog post. By hackborn. smallpt. A port of the smallpt global illumination renderer to Go. By Maurice Gilden. Dead An implementation of Post. Script using draw. By Legoff Laurent. Raytracer based on Yafaray.