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- Multithreading typically refers to sharing a single CPU between multiple tasks (or "threads") in a way designed to minimise the time required to switch threads. This is accomplished by sharing as much as possible of the program execution environment between the different threads so that very little state needs to be saved and restored when changing thread. Multiple threads can be executed in parallel on many computer systems. This multithreading generally occurs by time slicing, wherein a single processor switches between different threads--in which case the processing is not literally "simultaneous", for the single processor is only really doing one thing at a time. On a multiprocessor system, threading can be achieved via multiprocessing, wherein different threads can run simultaneously on different processors. www.NetworkDictionary.com
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- The design of the Java language makes multithreading essential for all but the simplest applets. In particular, IO and GUI programming both require multithreading to provide a seamless experience for the user. - IBM by
- On a multi-processor computer, multithreading is implemented with a mixture of time-slicing and genuine concurrency – where different threads run code simultaneously on different CPUs. - O'Reilly Media by
- Multithreading requires careful programming. For most tasks, you can reduce complexity by queuing requests for execution by thread pool threads. - Microsoft Corporation by
Compare [close] - Hungarian
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- Egy számítógépen párhuzamosan több szál is futhat (multithreading); ekkor több program futtatását végzi egy vagy több processzor. Wiki - by Miklós Monostory
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- A végrehajtási szál (angolul thread) az informatikában valamilyen szekvenciálisan végrehajtható utasítás-sorozat.
A legtöbb modern operációs rendszer már rendszerszinten biztosítja ezt a felületet. Egy számítógépen párhuzamosan több szál is futhat (multithreading); ekkor több program futtatását végzi egy vagy több processzor. Ha a futtatott szálak száma meghaladja a processzorok számát, a processzor idejét el kell osztani a szálak között. Ezen az időosztást is többnyire az operációs rendszerek végzik. - Wikipédia by Miklós Monostory
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- Prokládané vícevláknové zpracování: Procesor zpracovává dvě nebo více vláken. Blokové vícevláknové zpracování: Instrukce jsou prováděny sekvenčné tak dlouho, dokud nedojde k události, která může způsobit zpoždění (např. cache miss). Pak se přepne na nové vlákno.
vutbr.cz - by Milos Prudek
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- To se samozřejmě v aplikacích podporujících vícevláknové zpracování projevit může. - vbnet.cz by Milos Prudek
- Dnešní článek je zaměřen na problematiku vláken a vícevláknového zpracování v Borland Kylixu. - linuxzone.cz by Milos Prudek
- V testech skutečných aplikací už ovšem byly výsledky jiné, záleželo na tom, zda daná aplikace podporuje vícevláknové zpracování a jak dobře. - mujmac.cz by Milos Prudek
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- Multithreading
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Der Begriff Multithreading (auch Mehrfädigkeit) bezeichnet das gleichzeitige Abarbeiten mehrerer Threads (das sind Ausführungsstränge innerhalb eines einzelnen Prozesses oder eines Tasks).
Software [Bearbeiten]
Meist ist mit dem Begriff das softwareseitige Multithreading gemeint, bei dem in aller Regel nur ein Prozessor beteiligt ist. Die dann vorhandene scheinbare Gleichzeitigkeit wird in Wirklichkeit durch geschickte Programmierung erzeugt. Einzelne Threads eines Prozesses/Tasks können sehr schnell auf zeitkritische Ereignisse reagieren, während andere Threads langwierige Berechnungen durchführen.
Ohne weitere Hardwareunterstützung reduziert das Multithreading die Gesamtsystemleistung durch den bei Threadwechseln entstehenden Overhead. Deshalb wird der Programmierer die Anzahl der Threadwechsel möglichst gering halten.
Bei symmetrischen Multiprozessorsystemen kann die Rechenarbeit eines Prozesses/Tasks durch Multithreading auf mehrere Systemprozessoren verteilt werden.
Hardware [Bearbeiten]
Das hardwareseitige Multithreading unterscheidet sich vom softwareseitigen dadurch, dass die Hardware eines Prozessors das gleichzeitige Abarbeiten mehrerer Threads unterstützt. Die Software muss durch softwareseitiges Multithreading oder mehrerer Prozesse/Tasks diese Fähigkeit ausnutzen.
Da beim hardwareseitigen Multithreading kein Overhead beim Thread-Wechsel entsteht, sondern im Gegenteil durch die Vermeidung von Pipeline-Hazards unproduktive Taktzyklen vermieden werden, kann die Gesamtsystemleistung pro CPU steigen, indem Threadwechsel möglichst häufig vorgenommen werden. Wikipedia - by Uwe Dulz
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- Auffallend sei hingegen, dass der Prozessor nicht für das so genannte Multithreading ausgelegt sei, mit dessen Hilfe ein Kern mehrere Rechenanweisungen auf einmal ausführen kann, was Intel und Sun Microsystems in einigen Chips nutzen. - heise.de by Uwe Dulz
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- Izvajanje programov ali procesov v več nitih, ki se lahko hkrati izvajajo v različnih procesorjih oz. jedrih procesorja. Own research - by Milan Bedrač
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- Večnitnost v operacijskih sistemih (Samo Dečman) (650 kB) - Fri.uni-lj.si by Milan Bedrač
- V sistemih z več procesorji kakršne najdemo v strežnikih in računalnikih za znanstvene izračune pa se večnitno programiranje uveljavlja že dalj časa. Operacijski sistem lahko ob uporabi več niti vsako nit razporedi na svoj procesor in tako zagotovi polno izrabo računskih kapacitet. - Fri.uni-lj.si by Milan Bedrač
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- Многонишковите (multithreaded) програми представляват програми, които могат да изпълняват едновременно няколко редици от програмни инструкции. Всяка такава редица от програмни инструкции наричаме thread (нишка). Изпълнението на многонишкова програма много прилича на изпълнение на няколко програми едновременно. Например в Microsoft Windows е възможно едновременно да слушаме музика, да теглим файлове от Интернет и да въвеждаме текст. Тези три действия се изпълняват от три различни програми (процеси), които работят едновременно. Когато няколко процеса в една операционна система работят едновременно, това се нарича многозадачност. Когато няколко отделни нишки в рамките на една програма работят едновременно, това се нарича multithreading (многонишковост). Светлин Наков - by 4leavedClover
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- В едно приложение понякога се налага да се изпълняват операции, отнемащи много време ( при дълбока рекурсия, при работа с големи обеми от данни). Докато те се изпълняват потребителският интерфейс на отговаря, тъй като приложението вече е поела съответната времеотнемаща операция. В такива случаи потребителят трябва да бъде известяван за статуса на извършваната работа и при необходимост да допуска потребителска намеса. Този и други подобни проблеми се решават чрез реализиране на многонишковост. - teacher.bg by 4leavedClover
- Многонишковост - Нишки - Л. Чорбаджиев, � by 4leavedClover
- 3. Създаване на потребителски интерфейс. Потребителски интерфейс на Windows приложение. Създаване и работа с диалогови прозорци. Извеждане и отпечатване данните на приложението. Реализиране на многонишковост. Контекстно-зависима помощ 6 ч. - ПРОГРАМНИ ИНТЕРФЕЙСИ by 4leavedClover
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