AOT vs JIT compilation in Java

Tiered compilations, code caches and more..
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Master difficult programming concepts in few minutes. I try to explain difficult concepts like Java concurrency in simple to understand manner. Explore videos on topics like Spring Boot, Cloud Foundry, Java 8 and more. I am happy to clarify your doubts. Ask me anything in the comments. Also happy to take requests for new videos.
New video every Sunday.
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[@rsrini7]

Very deep and presenting in simpler way. Understood your ground work and effort to make it more simple. Hats off you Bro.. Thanks.

[@user-rr9tl5pd8k]

On the first slide - bytecode is not compiled into machine code, it is interpreted by the JVM into machine code. On the second slide it is correctly described =D

[@AsymptoteEducation]

An absolute gem This is the kind of detail I look for.

[@djohnjimmy]

This is an awesome simple explanation of what everyone else seemed to make very complicated videos about. Great video. Thank you buddy

[@VinodMoorkoth]

Great video man. I was actually looking for CPython implementation, but still watched the whole video.Too good. Thank you.

[@malathim5138]

very good explanation. thank u so much. I have been spending time for more than 10 hours to understand how JIT works. Finally I understood the concept easily.

[@abhinavomprakash4884]

Bro, this was an excellent talk. Keep the content coming!

[@raz0229]

Crystal clear. Exactly what I was looking for

[@musa94]

wow wow wow! great video, really cleared a lot of fog!

[@ritushrivastava88]

Nicely explained. Thanks!!

[@apoorvagupta4108]

Great Job. Through your video it was easy to understand the difference and flow of execution.

[@noahflorin-sefton2992]

Good stuff. I like the way you went straight in as well.

[@TheKurama9]

Very well explained. Thank you so much!

[@pranavhs4535]

Super explanation , keep going Now I understood completely. Before you watch this video I recommend reading about AOT,JIT,Compiler s and interpreters which helped me to understand fully.

[@asidz]

Brilliant explanation. Thanks!

[@gokuls9929]

Fantastic! Your videos do justice to the name of the channel - they defog technology!

[@ramkrishnakulkarni8289]

Awesome work man!!! 🙌🏻🙌🏻👌 deep and upto the mark. Please share more such videos. Thank you.

[@pgaikwad06]

Very nice explaination! Cleared few finer doubts as well.. Thanks

[@richardwang3438]

This is awesome, thank you

[@SureshramT]

Exceptional screenplay 🔥

[@premraj.m]

This is the best video for JIT and AOT.. thanks

[@rhul0017]

Crisp and clear, good brother💪

[@rizwanfirdous]

Excellent explanation in short.

[@thalathotitharunprabhakar3390]

Thank you for the wonderful content. This video helped me to understand AOT and JIT clearly.

[@nicholaicorbie]

Excellent explanation

[@sachinprabhuk6241]

Awesome explanation. Thank you very much

[@garimadwivedi9541]

Thanks for explaining everything

[@higiniofuentes2551]

Thank you for this very useful video!

[@mirageman2]

Great and dense information, thanks a lot.

[@shalomzilb3689]

Solid explanation!

[@NewLondonMarshall]

Fantastic video!

[@SRUJANCH21]

Superb explanation, Thanks for sharing this kind of video's

[@dyhigsth4632]

Great, got the high level view perfectly

[@rakeshtm2750]

Awesome videos and explanation...

[@prasanthrajendran1611]

Nice video, simply could able to understand the java compilation insights...Kudos..Bravo Zulu..

[@utkarshgupta2909]

This guys tells thing totally unique, I request you to present more content. Everytime I come on this channel I learn something new

[@tatha2001]

Superb explanation 👍

[@hotmandead1]

Excellent Video!

[@PrinceRambade_Official]

Very nice explanation...

[@doubleDip24]

Awesome work . thumbs up.

[@mahendharkhedhar7887]

Superb content

[@DivijShrivastava]

Very nice video. Please keep posting.

[@tanaykamath1415]

Brilliant video 👍👍🔥🔥

[@shom-tv]

great material

[@VictorHernandez-zi7ll]

Great content.

[@mathrupradeep]

Good videos. Thanks

[@ChrisAthanas]

Excellent

[@basicneed13]

Keep up the good work. Hope you will get more subscriber Also keep adding more videos...

[@user-ke9xj2mh4f]

AMAZING!

[@mgking777]

great video!

[@IslamDawood1]

Thanks!

[@daanishsarguru3044]

Thanks Sir

[@MsRoshancool]

nice work.

[@DurgaShiva7574]

best best best, u r the best, hats off 2 u, not sure, why u have stopped making videos

[@avinashsingh-hd4pl]

Best explanation ever on youtube

[@nageshmh]

awesome 😍

[@MrMikomi]

Great tutorial, as ever. Just wondering what real-world improvements in performance are to be expected by performing these AOT native code compilation steps. Anyone know?

[@shubhamdeshkar1685]

This is cool. Please include resources in your videos as well.

[@balakrishnajangita6638]

Hat's off boss

[@ramprasad1696]

Nice video and explanation , can you please provide the resources also form where you have collected the information so that we can learn more anyway thanks

[@liyuling1984]

Good

[@C0pr4]

Clarification nailed , you got that boss !

[@souvik5560]

Fantastic (Y)

[@edwindavidcontreras4615]

Crack !! Thx

[@video-vocabulary]

6:13 Could Object be stored directly in the Stack during Escape Analysis? Or does it mean that Object is converted into some form of Primitives to fit in the Stack?

[@balasubramanian7997]

Hi defog tech, what will happen if we load more than required size of compiled libraries to code cache by AOT

[@vijayakumarvj]

amazing . pls share ppt

[@hiteshelaprolu1667]

First of all kudos to you for precise explanation of jvm internal and concurrency concepts @8:42 u mentioned that as of java 9 it supports only Intel architecture .what about mobile sdk and other architecture portability

[@DefogTech]

It's not just Intel but any x86 architecture (includes AMD). AOT project is now merged with GraalVM. ARM support is not there yet AFAIK

[@amritshrivastava4523]

JVM is very smart and so is your teaching methodology :) @Defog Tech

[@DefogTech]

Thanks! 😃

[@tivmego]

@@DefogTech Please Defrog, what happened? We haven't got any new videos in recent times. How can we help? We want only you to teach these concepts because of the simplicity.

[@DefogTech]

@@tivmego havent had the time due to my new role (currently handling 5 teams, 30 engineers).. though I miss making videos. Planning to create paid video courses so that it can be financially sustainable, and will allow me to do this full time. Bored of the corporate job to be honest :) In addition to KZbin also want to build a community of us folks teaching each other. Lets see how it goes

[@tivmego]

@@DefogTech Oh. So sorry to hear this. Hope you can put together the paid tutorial so we can continue to get the best of you. Thanks for replying.

[@shubham30372]

Awesome video ....... clear explanation Hats off to you bro... jst wanted to know what is ur reference point or book for this in-depth knowledge?

[@DefogTech]

For java, I refer to book Concurrency in practice, and also memory model specification

[@shubham30372]

Defog Tech Thanks sir 😊

[@theshermantanker7043]

I'd like to point out that the AOT Compiler has been removed as of Java 16, but not to worry, that's because it's going to be replaced with a new (and better) one!

[@higiniofuentes2551]

Since then, AOT is for more architectures? Can you give the options needed to optimze the AOT compilation? Thank you!

[@swapnilc17]

Deep concept. Which all resources were referred for understanding this concept sir ?

[@DefogTech]

Lot of resources - JEP for AOT in Java9, Stackoverflow, couple of videos on KZbin, and lot of articles about inner workings of JVM

[@pandit-jee-bihar]

Java is slowly moving towards traditional compilation.

[@GK-rl5du]

C1 and C2 compilers need runtime profile data to produce optimized machine instructions. AOT does bytecode to machince code translation even before running the code once, so is it safe to assume that AOT compiled java code will run slower than JIT compiled one?

[@DefogTech]

Since compiling code at runtime itself takes time, and since until then the code is run in interpreted manner, the code can be slow even in JIT. Its use-case specific.

[@GK-rl5du]

@@DefogTech So we have to compromise between fast startup times (With AOT) and faster application execution times (With JIT). Correct?

[@hix0071]

This means java is interpreted and compiled language both ? So if I have a very simple java program and all it does is print hello, then nothing will be compiled as such. Everything can be interpreted. Is my understanding correct ? @Defog ?

[@handleh]

Yes

[@haykmkrtchyan7093]

I have a question. Assume that JVM compiled our add() method 5000 times, and the threshold is also 5000. If we will change our add() method functionality, will the byte code from cache conform for the changed add() method bytecode? I mean if we change our add() method functionality, does it need to compile our method again, because if it will get the byte code from cache, it will be not actual) Or maybe I didn't understand something? Please explain :)

[@prajwal5817]

if you change code then you need compile whole thing anyway

[@User-ow7rn]

sir, can you make a video on difference between interface and abstract class based on logic, not the rules or keyword differences. i mean why do we need interface if we have abstract class. we can undefined every method of abstract class. it will behave just like interface too. and if you are gonna say to overcome diamond problem then why will we overcome that problem if we are going to define the method definition side another method. i mean what's the point. and even if we can overcome method ambiguity of diamond problem, variable ambiguity is still there which is handled by accessing variable of interface using interfaceName.varname then why cant we do this way for accessing methods?

[@girjashankar7925]

I want to ask a question ,why languages like c++,c dont improve to make itself machine independent? why cant they use interpreter directly just like javascript or bytecode concept like java?

[@DefogTech]

more often than not you dont need that much portability, you can compile language to your platform and run it on local, while CI/CD pipeline can compile it for integration/production environments. so there is no major downside to compiling

[@mohbit3336]

JDK 9's AOT is restricted to Linux x64 systems not x86 i read it on some other website

[@nadimmatoussi8772]

There is 64 bits x86 CPUs

[@pandit-jee-bihar]

Java should have a flag to turn off interpreter and get machine code only for entire code if needed.

[@mysticlunala8020]

AOT > Any other anime.

[@smarttrupti2007]

Wow. . Great explanation. Thanks

[@migueloliveraangeles]

Thanks!