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Computational problem of interest in computer science
Unsolved problem in computer science Is there a k {\displaystyle k} -competitive algorithm for solving the k {\displaystyle k} -server problem in an arbitrary
K-server_problem
adaptive offline adversary. Competitive analysis (online algorithm) K-server problem Online algorithm Borodin, A.; El-Yaniv, R. (1998). Online Computation
Adversary_model
Algorithm that begins on possibly incomplete inputs
performance. This problem is PSPACE-complete. There are many formal problems that offer more than one online algorithm as solution: k-server problem Job shop scheduling
Online_algorithm
Metrical task systems generalize online problems such as paging, list accessing, and the k-server problem (in finite spaces). A task system is a pair
Metrical_task_system
Computer networking optimization problem
problem has long since been solved, with the number of possible connections to a single computer being in the millions. The problem of socket server optimisation
C10k_problem
Name server for the DNS root zone
[[File:ams-ix.k.root-servers.net.jpg|290px|thumb|A Cisco 7301 router and a Juniper M7i, part of the K root-server instance at AMS-IX A combination of
Root_name_server
Mathematical models of strategic interactions
theory has played a role in online algorithms; in particular, the k-server problem, which has in the past been referred to as games with moving costs
Game_theory
American mathematician
particularly for the k-server problem. His contributions, with his co-author Marek Chrobak, led to the application of T-theory to the server problem. Larmore earned
Lawrence_L._Larmore
Mathematical space with a notion of distance
clustering problems where hierarchical clustering can be performed more efficiently on tree metrics. Online algorithms: Benefits problems like the k-server problem
Metric_space
Information retrieval using cryptography
privacy for their query in a single-server setting. There are two ways to address this problem: make the server computationally bounded or assume that
Private_information_retrieval
Method for analyzing online algorithms
Peleg 1992). Adversary (online algorithm) Amortized analysis K-server problem List update problem Online algorithm Sleator, D.; Tarjan, R. (1985), "Amortized
Competitive analysis (online algorithm)
Competitive_analysis_(online_algorithm)
Object in graph theory
the eternal dominating set problem is related to the k-server problem in computer science. Motivated by ancient problems in military defense described
Eternal_dominating_set
Queue model
a single server. Most performance metrics for this queueing system are not known and remain an open problem. A queue represented by a M/G/k queue is a
M/G/k_queue
performance. This problem is PSPACE-complete. There are many formal problems that offer more than one online algorithm as solution: k-server problem Job shop scheduling
Online_optimization
Branch of graph theory
analysis, which is used to create phylogenetic trees. Online algorithms - k-server problem Bernd Sturmfels, Professor of Mathematics and Computer Science at Berkeley
T-theory
Hashing technique
of web servers. Tim Berners-Lee credits consistent hashing algorithms, and Daniel Lewin as their inventor, with solving the slashdotting problem which
Consistent_hashing
Notion in metric geometry
The tight span serves a role in several online algorithms for the K-server problem. Sturmfels & Yu (2004) uses the tight span to classify metric spaces
Tight_span
Professor
work competitive analysis of online algorithms, particularly for the k-server problem, on information dissemination in ad-hoc radio networks, and on graph
Marek_Chrobak
Required (RFC 6585) The origin server requires the request to be conditional. Intended to prevent the 'lost update' problem, where a client GETs a resource's
List_of_HTTP_status_codes
Application layer protocol
in small packets to almost solve the problem of the HOLB (head-of-line blocking); a push capability to allow server application to send data to clients
HTTP
Issues affecting Network Time Protocol server
denial-of-service attacks known at the time. The most troublesome problems have involved NTP server addresses hardcoded in the firmware of consumer networking
NTP_server_misuse_and_abuse
Linked hypertext system on the Internet
made available to the network through web servers and can be accessed by programs such as web browsers. Servers and resources on the World Wide Web are
World_Wide_Web
Open source web server and a reverse proxy server
"engine x" /ˌɛndʒɪnˈɛks/ EN-jin-EKS, stylized as NGINX or nginx) is a web server that can also be used as a reverse proxy, load balancer, mail proxy and
Nginx
Networking protocol for clock synchronization
100 ms or more. The protocol is usually described in terms of a client–server model, but can as easily be used in peer-to-peer relationships where both
Network_Time_Protocol
Computer operating system
the computing industry – Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems. Windows itself is further grouped
Microsoft_Windows
Principal protocol used to assign IPv4 addresses on an IPv4 network
accurate binding information between two servers is a complicated problem; if both servers are able to update the same lease database, there must be a mechanism
Dynamic Host Configuration Protocol
Dynamic_Host_Configuration_Protocol
Mathematical and computational problem
The bin packing problem is an optimization problem, in which items of different sizes must be packed into a finite number of bins or containers, each of
Bin_packing_problem
Set of computers configured in a distributed computing system
other through fast local area networks, with each node (computer used as a server) running its own instance of an operating system. In most circumstances
Computer_cluster
Style of network communication where requests are sent by the client
the client, and then is responded to by the server. The reverse is known as push technology, where the server pushes data to clients. Pull requests form
Pull_technology
Solid oxide fuel cell power generator made by Bloom Energy
hand-made 100 kW Bloom Energy Server is $700,000–800,000. In 2010, the company announced plans for a smaller, home sized Bloom server priced under $3
Bloom_Energy_Server
Software development practice
Typically, a server builds from the integration area frequently, i.e. after each commit or periodically, like once a day. The server may perform quality
Continuous_integration
Problems which attempt to find the most efficient way to pack objects into containers
web server. The problem is NP-complete in general, but there are fast algorithms for solving small instances. In tiling or tessellation problems, there
Packing_problems
1964 film by Krishnan–Panju
Server Sundaram is a 1964 Indian Tamil-language comedy drama film directed by Krishnan–Panju and produced by A. V. Meiyappan. The film stars Nagesh as
Server_Sundaram
Computer bugs related to the year 2000
represented. Microsoft Exchange Server was one of the more significant systems affected by the Y2K22 bug. The problem caused emails to be stuck on transport
Year_2000_problem
RFC 734. Retrieved 2019-09-24. Harrenstien, K.; Stahl, M.; Feinler, E. (October 1985). HOSTNAME SERVER. IETF. pp. 1. doi:10.17487/RFC953. RFC 953. Retrieved
List of TCP and UDP port numbers
List_of_TCP_and_UDP_port_numbers
Protocol for real-time Internet chat and messaging
of implicit trust between servers. However, this architecture has a number of problems. A misbehaving or malicious server can cause major damage to the
IRC
Security issue for web applications
than server-side scripting because it does not need to connect to a remote server and the page or frame does not need to be reloaded). Another problem with
Cross-site_scripting
Computer network protocol
Sec-WebSocket-Key header, solving this problem. Comparison of WebSocket implementations Network socket Push technology XMLHttpRequest Server-sent events WebRTC HTTP/2
WebSocket
Internet ecosystem layer that addresses bottlenecks
distribution network is a geographically distributed network of proxy servers and corresponding data centers. CDNs provide high availability and performance
Content_delivery_network
Source code management software
Azure DevOps Server, formerly known as Team Foundation Server (TFS) and Visual Studio Team System (VSTS), is a Microsoft product that provides version
Azure_DevOps_Server
Mail sent using electronic means
bounce message back to the sender, indicating the problem. Users can retrieve their messages from servers using standard protocols such as POP or IMAP, or
Pairing where no unchosen pair prefers each other over their choice
mathematics, economics, and computer science, the stable matching problem is the problem of finding a stable matching between two equally sized sets of elements
Stable_matching_problem
American businessman (born 1944)
system to Microsoft Corporation, which now markets it under the name "SQL Server". Sybase soon fell victim to merger mania; its 1996 merger with Powersoft
Larry_Ellison
Worldwide computer-based distributed discussion system
had administrators on a server-by-server basis, not as a whole. A few famous administrators: Chris Lewis Gene Spafford, a.k.a. Spaf Henry Spencer Kai
Usenet
System to identify resources on a network
name servers for each domain. Network administrators may delegate authority over subdomains of their allocated name space to other name servers. This
Domain_Name_System
Distributed version control software system
refresh ourselves on what that means. The biggest problem with the old protocol is that the server would immediately list all of the branches, tags, and
Git
Mathematical study of waiting lines, or queues
amount of service k describes the number of servers at the queueing node (k = 1, 2, 3, ...) If the node has more jobs than servers, then jobs will queue
Queueing_theory
Internet protocol used for relaying e-mails
was originally started because popular mail servers would often rewrite mail in an attempt to fix problems in it, for example, adding a domain name to
Simple_Mail_Transfer_Protocol
Application layer protocol for e-mail retrieval and storage
standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. IMAP is defined by RFC 9051. IMAP was designed
Internet Message Access Protocol
Internet_Message_Access_Protocol
Interface between Web servers and external programs
incompatibilities existed between different HTTP server variants that undermined script portability. Recognition of this problem led to the specification of how data
Common_Gateway_Interface
Messaging pattern in which senders and receivers do not directly communicate
that use brokers (servers), the argument for a broker to send messages to a subscriber is in-band, and can be subject to security problems. Brokers might
Publish–subscribe_pattern
Set of edges without common vertices
to the other side of the graph ("servers") or discarded. This is a natural generalization of the secretary problem and has applications to online ad
Matching_(graph_theory)
Conflict of interest when one person acts on another's behalf
The principal–agent problem (often abbreviated agency problem) refers to the conflict in interests and priorities that arises when one person or entity
Principal–agent_problem
Family of Unix-like operating systems
US K–12 education market and represents nearly 20 percent of sub-$300 notebook sales in the US. Linux is the leading operating system on servers (over
Linux
American mathematician
counterexample before finding a simpler example after reformulating the problem in frequency space. Her findings were published in the preprint titled
Hannah_Cairo
Automated message from an email system
message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". This feedback
Bounce_message
Type of database that uses vectors to represent other data
Subset of artificial intelligence Nearest neighbor search – Optimization problem in computer science Recommender system – System to predict users' preferences
Vector_database
Web browser made by Mozilla
features include a File Transfer Protocol (FTP) client for browsing file servers, the ability to block images from individual domains (until version 72)
Firefox
Files on Jeffrey Epstein and his affiliates
unredacted files on a government server. After the DOJ announced it would allow individual representatives to view files on the server, pressure from Thomas Massie
Epstein_files
American multinational computer corporation
hardware/software integrated application server Exalytics In-Memory Machine – hardware/software integrated in-memory analytics server Oracle Database Appliance Big
Oracle_Corporation
Cryptographic protocols for securing data in transit
extension. The major problem being that the certificate needs to be reissued whenever a new virtual server is added. To provide the server name, Transport
Transport_Layer_Security
Decentralized machine learning
methodology below, a central server is used for aggregation, while local nodes perform local training depending on the central server's orders. However, other
Federated_learning
Director of the FBI since 2025
"Durham alleges cyber analysts 'exploited' access to Trump White House server". The Hill. Retrieved January 8, 2026. Williamson, Elizabeth; Savage, Charlie
Kash_Patel
Email and calendaring software
organizations can deploy it as multi-user software (through Microsoft Exchange Server or SharePoint) for shared functions such as mailboxes, calendars, folders
Microsoft_Outlook
Graphical desktop-sharing system
forking has not led to compatibility problems because the RFB protocol is designed to be extensible. VNC clients and servers negotiate their capabilities with
VNC
Type of cyber-attack
widely, spanning from inundating a server with millions of requests to slow its performance, overwhelming a server with a substantial amount of invalid
Denial-of-service_attack
System for describing queueing models
This is sometimes denoted c + K where K is the buffer size, the number of places in the queue above the number of servers c. The size of calling source
Kendall's_notation
Principal protocol used to stream data across an IP network
booting, and servers that serve simple requests from huge numbers of clients (e.g. DNS servers) the complexity of TCP can be a problem. Tricks such as
Transmission_Control_Protocol
American internet personality (born 1999)
gaming, commentary, and reaction content. He is a former member of Minecraft server communities such as SMPLive and Dream SMP. He was a co-owner of streamer
Jschlatt
SQL database engine software
Server and the proprietary Enterprise Server. MySQL Enterprise Server is differentiated by a series of proprietary extensions which install as server
MySQL
Free online crowdsourced encyclopedia
sent to load-balancing servers running the Linux Virtual Server software, which in turn pass them to one of the Apache web servers for page rendering from
Wikipedia
Extension of Internet protocol
sending email messages; each server was by design an open mail relay. As a result, spam and worms, while not initially a problem, had become a plague by the
SMTP_Authentication
Algorithm for public-key cryptography
numbers, the "factoring problem". Breaking RSA encryption is known as the RSA problem. Whether it is as difficult as the factoring problem is an open question
RSA_cryptosystem
American social networking service
2008,[timeframe?] the messages were handled by a Ruby persistent queue server called Starling. Since 2009, implementation has been gradually replaced
X_(social_network)
Line of Intel microprocessors released in 2022
switching some of its customers to AMD-powered game servers because of the severity of the problems and the lack of prompt fixes. Gaming laptops have also
Raptor_Lake
Measuring user behavior on the web
available. However, this only partially solves the problem because often users behind a proxy server have the same user agent. Other methods of uniquely
Web_analytics
Cryptographic network protocol
SSH server in Windows typically involves enabling a feature in the Settings app. SSH is important in cloud computing to solve connectivity problems, avoiding
Secure_Shell
Linux distribution by Fedora Project
December 2014, three editions have been made available: personal computer, server and cloud computing. This was expanded to five editions for containerization
Fedora_Linux
Database manager part of the Microsoft 365 package
acknowledged an intermittent query performance problem with all versions of Access and Windows 7 and Windows Server 2008 R2 due to the nature of resource management
Microsoft_Access
having him warn Kadeer. The ruse works, and they track the network to a server farm, which Nolan infiltrates with a team including Garza's niece, Elena
List_of_The_Rookie_episodes
Computer communications protocol
proxy then makes a TCP connection to a particular server:port, and relays data between that server:port and the client connection. Because this creates
Tunneling_protocol
Network addressing and routing methodology
such problems were not observed, and these objections dissipated by the early 2000s. Many initial anycast deployments consisted of DNS servers, using
Anycast
Type of website edited collaboratively
scripts which operate an existing web server, a standalone application server that runs on one or more web servers, or in the case of personal wikis, run
Wiki
Indian-American engineer (born c. 1960)
2010, Bloom Energy launched Sridhar's newest invention, the Bloom Energy Server, also known as the Bloom Box, an energy-efficient and environmentally-friendly
K._R._Sridhar
Facility used to house computer servers
operations worldwide. In 2011, server racks in data centers were designed for more than 25 kW, and the typical server was estimated to waste about 30%
Data_center
Chatbot developed by Google
introducing personalization and productivity features. An invite-only chatroom ("server") on Discord was created in July, consisting of users who heavily used Bard
Google_Gemini
Server computer
The Dell blade server products are built around their M1000e enclosure that can hold their server blades, an embedded EqualLogic iSCSI storage area network
Dell_M1000e
Multimedia delivery method
2023. Brookes, Tim (30 March 2023). "No Plex App, No Problem: Using Plex as a DLNA/UPnP Server". How-To Geek. Retrieved 5 May 2024. Staples, Kim (20
Streaming_media
Computer authentication protocol
designers aimed it primarily at a client–server model, and it provides mutual authentication—both the user and the server verify each other's identity. Kerberos
Kerberos_(protocol)
"Neevu Vachhe" Amma Naa Kodala "Goranta Depam" Vandemataram Srinivas K. S. Chithra Server Sundharam Gari Abbayi Tholakarilo Chinukante" AS Geetha Krishna P
List of songs recorded by Swarnalatha
List_of_songs_recorded_by_Swarnalatha
pieces, see Fairy chess piece; terms specific to chess problems, see Glossary of chess problems; named opening lines, see List of chess openings; chess-related
Glossary_of_chess
Large language model developed by Google
Gemini directly to the terminal, offering advanced coding, automation, and problem-solving features with generous free usage limits for individual developers
Gemini_(language_model)
American information technology company (1939–2015)
included personal computing devices, enterprise and industry standard servers, related storage devices, networking products, software, and a range of
Hewlett-Packard
American multinational semiconductor company
include microprocessors, embedded processors, and graphics processors for servers, workstations, PCs, and embedded system applications, as well as chipsets
AMD
Data encryption and authentication program
experience with patent and export problems led them to eschew patents entirely. PGP 3 introduced the use of the CAST-128 (a.k.a. CAST5) symmetric key algorithm
Pretty_Good_Privacy
American multinational software company
would make it easier to pirate Adobe's expensive products. Published on a server of a Russian-speaking hacker group, the "disclosure of encryption algorithms
Adobe_Inc.
Open access website
Crystallographic Server is an open access website offering online crystallographic database and programs aimed at analyzing, calculating and visualizing problems of
Bilbao Crystallographic Server
Bilbao_Crystallographic_Server
Coordination of independent clocks
Ethernet systems. In a system with a central server, the synchronization solution is trivial; the server will dictate the system time. Cristian's algorithm
Clock_synchronization
Platform for users to upload, share, or live stream videos on the Internet
store, and play back video content on the Internet, often via a private server structured, large-scale system that may generate revenue. Users will generally
Online_video_platform
Discrete probability distribution
= k 1 , X 2 = k 2 ) = exp ( − λ 1 − λ 2 − λ 3 ) λ 1 k 1 k 1 ! λ 2 k 2 k 2 ! ∑ k = 0 min ( k 1 , k 2 ) ( k 1 k ) ( k 2 k ) k ! ( λ 3 λ 1 λ 2 ) k {\displaystyle
Poisson_distribution
K SERVER-PROBLEM
K SERVER-PROBLEM
Male
Greek
(Ἰσαάκ) Greek form of Hebrew Yitzchak, ISAÃK means "he will laugh."Â
Male
Polish
Polish form of Russian Svyatopolk, ÅšWIĘTOPEÅK means "blessed people."
Male
Icelandic
Icelandic form of German Ludwig, LÚÃVÃK means "famous warrior."
Male
Swedish
Swedish variant form of Scandinavian Erik, JERKER means "ever-ruler."
Male
Italian
Italian and Spanish form of Roman Latin Severus, SEVERO means "stern."
Male
Finnish
Finnish form of Roman Latin Severus, SEVERI means "stern."
Surname or Lastname
English
English : status name for a servant.
Surname or Lastname
English
English : variant of Semper.
Boy/Male
American, Australian, British, English, Welsh
Severe; Strict; Boundary
Male
English
Variant spelling of English Harvey, HERVEY means "battle worthy."
Male
Turkish
Turkish name BERKER means "solid man."
Boy/Male
Australian, French, Italian, Spanish
Strict; Restrained; Stern; Severe
Male
English
English occupational surname transferred to forename use, CARVER means "carver" of wood or stone.
Male
Hungarian
Hungarian form of Greek Isaák, IZSÃK means "he will laugh."Â
Male
Russian
Variant spelling of Russian Sergei, possibly SERGEJ means "sergeant."Â
Male
Russian
Variant spelling of Russian Sergei, possibly SERGEY means "sergeant."
Boy/Male
American, British, Christian, English, Indian, Jamaican
Sculptor; One who Carves Wood; Wood Carver; Carver of Wood or Stone
Male
Hungarian
Hungarian form of Old High German Berhtram, BERTÓK means "bright raven."
Surname or Lastname
English and Jewish (eastern Ashkenazic)
English and Jewish (eastern Ashkenazic) : occupational name from Old French serveur (an agent derivative of server ‘to serve’), Yiddish sarver ‘servant’.
Male
English
Wood Carver
K SERVER-PROBLEM
K SERVER-PROBLEM
Boy/Male
Indian, Sanskrit
Produced by Oneself
Boy/Male
British, English
God is Gracious
Surname or Lastname
English
English : possibly an altered spelling of northern Irish Carson.Swiss German : unexplained.
Boy/Male
Welsh
Legendary son of Aedd.
Boy/Male
Indian
Light of the Mind; Light of Sages
Boy/Male
Indian
Happiness
Boy/Male
Hindu, Indian, Marathi
Essence of the Vedas
Surname or Lastname
English
English : variant of Sell 1.
Boy/Male
Hindu
Golden king
Boy/Male
Hindu, Indian, Tamil
One of the World Lord Shiva
K SERVER-PROBLEM
K SERVER-PROBLEM
K SERVER-PROBLEM
K SERVER-PROBLEM
K SERVER-PROBLEM
v. t.
To perform the duties belonging to, or required in or for; hence, to be of use to; as, a curate may serve two churches; to serve one's country.
imp. & p. p.
of Nerve
n.
See Reaver.
superl.
Very strict in judgment, discipline, or government; harsh; not mild or indulgent; rigorous; as, severe criticism; severe punishment.
v. t.
To pass or spend, as time, esp. time of punishment; as, to serve a term in prison.
imp. & p. p.
of Serve
v. t.
To disunite; to disconnect; to terminate; as, to sever an estate in joint tenancy.
v. t.
To copulate with; to cover; as, a horse serves a mare; -- said of the male.
n.
A carver.
v. t.
To treat; to behave one's self to; to requite; to act toward; as, he served me very ill.
superl.
Sharp; afflictive; distressing; violent; extreme; as, severe pain, anguish, fortune; severe cold.
v. t.
To work; to operate; as, to serve the guns.
n.
One who serves.
v. t.
To cut or break open or apart; to divide into parts; to cut through; to disjoin; as, to sever the arm or leg.
a.
Having nerves of a special character; as, weak-nerved.
n.
A tray for dishes; a salver.
v. t.
To make legal service opon (a person named in a writ, summons, etc.); as, to serve a witness with a subp/na.
v. t.
To answer or be (in the place of something) to; as, a sofa serves one for a seat and a couch.
v. t.
To contribute or conduce to; to promote; to be sufficient for; to satisfy; as, to serve one's turn.
n.
The fur of the beaver.