JVM Explained in 10 minutes!

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Learn different types of JVM memory regions(Young Gen, Old Gen, MetaSpace, native, thread stack), why Java exceeds -Xmx limits and how Java programs are executed in this eye-opening video. Gain a deeper understanding of Java memory management in minutes!
If you liked this video, you'll love our Java Performance Masterclass. Learn more:
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Topics covered:
1:11 - Different memory regions
4:53 - How is Java program executed?
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yCrash: ycrash.io/
GCeasy: gceasy.io/
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fastThread Tool: fastthread.io/
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Опубликовано:

7 сен 2024

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Комментарии : 6

@LeonardoBPG 4 месяца назад

Thank you!

@vijendrayoutube4857 7 месяцев назад

Good explanation. Thanks for the video

@YouCanDoIt-cq3zq 10 месяцев назад

A very important memory area wasn't covered in this video: off-heap java memory, which is specified by -XX:MaxDirectMemorySize flag. If -XX:MaxDirectMemorySize is not provided, it will be equal to value set by Xmx. So is java is started with -Xmx4G then it means it can eat up to 8Gb easily.

@Michael-ZX 10 месяцев назад

DirectMemory is not the only one region that managed off-heap, it is One Of others. You really can eat a lot off-heap memory by working with large-zip files for example. Any native-code that allocates memory, allocate it in normal process memory - in off-heap. More over, the limit for the direct memory, no matter how it specified (explicitly or implicitly) doesn't mean that it would be reached easily. MaxDirectMemorySize is for applications, that uses direct-buffers actively, for others it's not so important as you can imagine. And at last, you have to monitor and pay attention for RSS, committed memory, not only for virtual space that can be TB or PB ;-)

@manasnaik6904 5 месяцев назад

In my application which is I/O based, I observed that heap memory behaviour is perfect but the main memory is gradually increasing and not releasing. What could be the possibility?

@manasnaik6904 5 месяцев назад

Which part of Java application use directMemory? Is it I/O operations?