Video Title: Virtual Threads Explained
Hey Java developers virtual threads are now a final feature in Java 21 let’s take a look at what virtual threads means for Java threads are the means by which all code is executed on the jvm every statement and method is executed in a thread historically threads in Java have been a relatively expensive
Resource as they typically mapped one toone to threads supplied by the operating system for applications needing only a couple of dozen threads this wouldn’t represent a major issue but threads are a finite resource and web applications which often have a thread per request bottle could use up available threads relatively
Quickly this wouldn’t necessarily be a problem if threads were being highly utilized however the reality is that threads can spend a lot of time idling while waiting for a response back from an external services like a database or web service zooming out and looking at this from the whole jvm perspective a
Significant amount of time could be spent idle leading to low CPU utilization despite all available threads being consumed to address this project Gloom split threads into two distinct Concepts platform threads implementations of java link thread that are wrapper of the thread provided by the OS and virtual threads
Also implementing Java link thread which exist only in memory and run on top of platform threads with virtual threads existing only in memory taking up a few kilobytes and having near instantaneous inul station there is not a meaningful limit on the number of virtual threads a Java application can use the scheduling
Of virtual threads is handled by the jdk placing FAL threads on available platform threads parking a thread when it encounters a blocking operation and taking a parked thread off the queue to run it on the freed up platform thread and eventually unparking the virtual thread to run it again when it receives
A response virtual threads are not tied to a specific platform thread and are free to move to whichever platform thread is available the context of the thread stack thread local availables Etc are part of the virtual thread and so travel with the virtual thread regardless of the platform thread it is
On which keeps the process of writing and debugging applications in the same blocking and imperative programming style Java developers are familiar with happy coding
Video Keywords: Java, Java programming language,Java,JDK,JVM,Java virtual machine,oracle,cloud,developer,programming
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Well-explained!
Good explanation. Lose the coffee joke. It's outdated. We all get it. Stop acting like it's the first time we've ever seen it.
Thanks for the concise and clear explanation.
Cup is empty
Oh yeas! I approve of this concise form 🙃😉
I imagine that caffeine tolerance will kick in at some point anyway and that lightning fast pace will suffer, but oh well… 😁
Best explanation I've seen so far, and under 3 minutes.
I like when he "sipped" from the cup and then start gesturing with his hand. I'd expect some coffee to be spilled 🙂
Can we have Futures with virtual threads?