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{{Short description|The definitions explain how virtual threads are different. They are a need due to multi-core CPUs}}
{{Draft topics|internet-culture|software|computing|technology}}▼
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▲{{Draft topics|software|computing|technology}}
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In [[computer programming]], '''virtual threads''' are [[Thread (computing)|threads]] that are scheduled by a [[runtime library]] instead of natively by the underlying [[operating system]] (OS). Virtual threads allows for tens of millions of preemptive tasks and events without swapping on a 2021 consumer-grade computer.<ref name="javaworld2">{{cite web |last1=Rudell |first1=Harald |date=2022-03-19 |title=massivevirtualparallelism |url=https://codeberg.org/haraldrudell/massivevirtualparallelism/src/branch/main/README.md |website= |quote= |df= |accessdate=}}</ref>, compared to low thousands of operating system threads<ref>{{Cite web |last=baeldung |date=2022-01-02 |title=Maximum Number of Threads Per Process in Linux {{!}} Baeldung on Linux |url=https://www.baeldung.com/linux/max-threads-per-process |access-date=2022-03-30 |website=www.baeldung.com |language=en-US}}</ref>. Preemptive execution<ref>{{Cite web |title=Go 1.14 Release Notes - The Go Programming Language |url=https://go.dev/doc/go1.14#runtime |access-date=2022-03-30 |website=go.dev}}</ref> is important to performance since constructs that are not preemptive, such as [[Coroutine|coroutines]] or the largely single-threaded [[Node.js]], introduce delays in responding to asynchronous events such as every incoming request in a server application<ref>{{Cite web |last=Node.js |title=Don't Block the Event Loop (or the Worker Pool) |url=https://nodejs.org/en/docs/guides/dont-block-the-event-loop/ |access-date=2022-03-30 |website=Node.js |language=en}}</ref>.
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