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ApacheBench
ApacheBench (ab is the real program file name) is a single-threaded command line computer program used for benchmarking (measuring the performance of) HTTP web servers. Originally it was used to test the Apache HTTP Server but it is generic enough to test any web server supporting HTTP/1.0 or HTTP/1.1 protocol versions. The ab tool is written in C and it comes bundled with the standard Apache source distribution, and like the Apache web server itself, is free, open source software and distributed under the terms of the Apache License. History The original program was named zb "ZeusBench V1.0" and it was written by Adam Twiss (Zeus Technology), in 1996, in order to test performance of Zeus Web Server. Soon later Twiss licensed (donated) that program to the Apache Group so that the derived program was renamed ab "ApacheBench". Since 1997, 1998 ab has been further developed and maintained, as a support program included in Apache HTTP server, from version 1.0 (1997,1998) to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeus Web Server
Zeus Web Server is a discontinued proprietary high-performance web server for Unix and Unix-like platforms (including Solaris, FreeBSD, HP-UX and Linux). It was developed by Zeus Technology, a software company located in Cambridge, England that was founded in 1995 by University of Cambridge graduates Damian Reeves and Adam Twiss. History Zeus was designed to be a high-performance web server since the beginning of its development (1995) and since a few years later till the first decade of 2000s it was known as one of the fastest and most scalable web servers available on market. Despite its excellent performance, it never gained more than a few percentage points (less than 3%) in the global usage of most popular web servers. However, it was commonly used by ''hardware vendors'' submitting SPECweb99 benchmarks for their hardware. The SPECweb99 benchmark was retired in 2005 and replaced by SPECweb2005. While some SPECweb2005 submissions were made using Zeus, by 2008 it was no l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Web Server Benchmarking
Web server benchmarking is the process of estimating a web server performance in order to find if the server can serve sufficiently high workload. Key parameters The performance is usually measured in terms of: *Number of requests that can be served per second (depending on the type of request, etc.); *Latency response time in milliseconds for each new connection or request; *Throughput in bytes per second (depending on file size, cached or not cached content, available network bandwidth, etc.). The measurements must be performed under a varying load of clients and requests per client. Tools for benchmarking Load testing (stress/performance testing) a web server can be performed using automation/analysis tools such as: *Apache JMeter, an open-source Java load testing tool *ApacheBench (or ab), a command line program bundled with Apache HTTP Server * Httperf, a command line program originally developed at HP Labs *Siege, an open-source web-server load testing and benchmarking too ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apache HTTP Server
The Apache HTTP Server ( ) is a free and open-source cross-platform web server software, released under the terms of Apache License 2.0. Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. The vast majority of Apache HTTP Server instances run on a Linux distribution, but current versions also run on Microsoft Windows, OpenVMS, and a wide variety of Unix-like systems. Past versions also ran on NetWare, OS/2 and other operating systems, including ports to mainframes. Originally based on the NCSA HTTPd server, development of Apache began in early 1995 after work on the NCSA code stalled. Apache played a key role in the initial growth of the World Wide Web, quickly overtaking NCSA HTTPd as the dominant HTTP server. In 2009, it became the first web server software to serve more than 100 million websites. , Netcraft estimated that Apache served 23.04% of the million busiest websites, while Nginx served 22. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeus Technology
Zeus Technology, Ltd. was a software company founded in 1995 and based in Cambridge, England, known for its web server. In July 2011, Zeus Technology was acquired by Riverbed Technology. In March 2015, Riverbed Technology sold the SteelApp business unit to Brocade Communications Systems. In June 2017, Brocade Communications Systems sold the vADC business unit to Pulse Secure. In December 2020 Pulse Secure, including the vADC business unit, was acquired by Ivanti. History Zeus Technology was founded in 1995 by Damian Reeves and Adam Twiss while they were undergraduates at Churchill College, University of Cambridge. The company grew rapidly during the excesses of the Dot-com boom. In June 2000 Zeus Technology was nominated one of the top 50 most important privately held companies in the world by Red Herring and one of the Top 100 Emerging Technology Companies by Tornado Insider in May 2001. A public flotation was anticipated but Zeus Technology remained privately held until its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:Squid Performance Tuning
True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting these criteria. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius or pen, made of chitin. Squid diverged from other cephalopods during the Jurassic and occupy a similar role to teleost fish as open water predators of similar size and behaviour. They play an important role in the open water food web. The two long tentacles are used to grab prey and the eight arms to hold and control it. The beak then cuts the food into suitable size chunks for swallowing. Squid are rapid swimmers, moving by jet propulsion, and largely locate their prey by sight. They are among the most intelligent of invert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AWStats
AWStats (Advanced Web Statistics) is an open source Web analytics reporting tool, suitable for analyzing data from Internet services such as web, streaming media, mail, and FTP servers. AWStats parses and analyzes server log files, producing HTML reports. Data is visually presented within reports by tables and bar graphs. Static reports can be created through a command line interface, and on-demand reporting is supported through a Web browser CGI program. AWStats supports most major web server log file formats including Apache (NCSA combined/XLF/ELF log format or Common Log Format (CLF)), WebStar, IIS (W3C log format), and many other common web server log formats. Development was moved from SourceForge to GitHub in 2014. Cross-platform availability Written in Perl, AWStats can be deployed on almost any operating system. It is a server-based website log analysis tool, with packages available for most Linux distributions. AWStats can be installed on a workstation, such as Micros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Webalizer
The Webalizer is web log analysis software, which generates web pages of analysis, from access and usage logs. It is one of the most commonly used web server administration tools. It was initiated by Bradford L. Barrett in 1997. Statistics commonly reported by Webalizer include hits, visits, referrers, the visitors' countries, and the amount of data downloaded. These statistics can be viewed graphically and presented by different time frames, such as by day, hour, or month. Overview Website traffic analysis is produced by grouping and aggregating various data items captured by the web server in the form of log files while the website visitor is browsing the website. The Webalizer analyzes web server log files, extracting such items as client's IP addresses, URL paths, processing times, user agents, referrers, etc. and grouping them in order to produce HTML reports. Web servers log HTTP traffic using different file formats. Common file formats are Common Log Format (CLF), the Apac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
User Agents
In computing, a user agent is any software, acting on behalf of a user, which "retrieves, renders and facilitates end-user interaction with Web content". A user agent is therefore a special kind of software agent. Some prominent examples of user agents are web browsers and email readers. Often, a user agent acts as the client in a client–server system. In some contexts, such as within the Session Initiation Protocol (SIP), the term ''user agent'' refers to both end points of a communications session. User agent identification When a software agent operates in a network protocol, it often identifies itself, its application type, operating system, device model, software vendor, or software revision, by submitting a characteristic identification string to its operating peer. In HTTP, SIP,RFC 3261, ''SIP: Session Initiation Protocol'', IETF, The Internet Society (2002) and NNTP protocols, this identification is transmitted in a header field ''User-Agent''. Bots, such as Web ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Server (computing)
In computing, a server is a piece of computer hardware or software (computer program) that provides functionality for other programs or devices, called " clients". This architecture is called the client–server model. Servers can provide various functionalities, often called "services", such as sharing data or resources among multiple clients, or performing computation for a client. A single server can serve multiple clients, and a single client can use multiple servers. A client process may run on the same device or may connect over a network to a server on a different device. Typical servers are database servers, file servers, mail servers, print servers, web servers, game servers, and application servers. Client–server systems are usually most frequently implemented by (and often identified with) the request–response model: a client sends a request to the server, which performs some action and sends a response back to the client, typically with a result or acknowledg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concurrency (computer Science)
In computer science, concurrency is the ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the outcome. This allows for parallel execution of the concurrent units, which can significantly improve overall speed of the execution in multi-processor and multi-core systems. In more technical terms, concurrency refers to the decomposability of a program, algorithm, or problem into order-independent or partially-ordered components or units of computation. According to Rob Pike, concurrency is the composition of independently executing computations, and concurrency is not parallelism: concurrency is about dealing with lots of things at once but parallelism is about doing lots of things at once. Concurrency is about structure, parallelism is about execution, concurrency provides a way to structure a solution to solve a problem that may (but not necessarily) be parallelizable. A number of mathema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operating System
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer from cellular phones and video game consoles to web servers and supercomputers. The dominant general-purpose personal computer operating system is Microsoft Windows with a market share of around 74.99%. macOS by Apple Inc. is in second place (14.84%), and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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