Virtual Memory: 4 How Does Virtual Memory Work?

[@ThumpingThromnambular]

My final's in 4 hours. I'm confident you're actually saving my ass right now. Wish I saw this before because it's so plainly laid out, and easy to understand. Seriously, I'm impressed.

[@altalena9139]

How'd you do?

[@ThumpingThromnambular]

I failed the class. I passed it and graduated the next semester though .

[@sreeharshaparuchuri6115]

SAME but in 1.5 hours =p

[@Huehhee7777]

Lol my final's in 5 hour

[@Eyenn_n]

OMG I have been struggling with understanding Virtual Memory for weeks, and now I finally get what it is and how it works. THANK YOU SOOOOOOOOOOOOOOO MUCH, SIR!!!!!!

[@dz-algorithms9119]

the most simple & efficient way to explain VM , better than long lectures from fAnCy universities

[@sicklecuthammerfall]

My professors this quarter have been absolutely terrible at teaching. Thank god that professors like you exist.

[@purleedef]

Thank you for your video series on MIPS and virtual memory. I really wish you would upload more, and I don't understand why there are so many college professors and "youtube educators" that can't pull off explanations this cleanly. You make it look so ridiculously easy.

[@JonnyInChina]

Bro you are a blessing for the world!! This is so much better explained than in my university

[@_chilliy]

Best series on this topic by far.

[@wafaabkl]

thank you very much for this playlist. I am a doctorat student, my instructor shared with us one of your videos. it is really helpful. thanks again.

[@leandrormor]

thanks for sharing, I'm still on the beginning but I'm loving it already, you have a gift to tech

[@ashishmehar1996]

you are doing agreat job for helping guys like me. these animations help in better understanding the Concepts. Keep it Up. Thanks for helping

[@HassaanRaza]

your explanation is very neat and clean super easy to understand.

[@Squirroo]

THANK YOU SIR FOR HELPING ME OUT. I really need this kind of visuals (lol) to fully understand the concepts and although my book is very clear and understandable, I still don't feel it works as well as some amazing videos people like you put on the internet! You are appreciated, keep up the good work!

[@galai4162]

still saving butts in 2021!! Thanks!!

[@MsDudin]

You, sir, are amazing. Thank you.

[@vishwajeetsb694]

Really helpful. Understanding VM in short span.

[@weallareearthling]

Awesome tutorial.I needed that.

[@이범진-z6i]

sending love from south korea !!

[@jinxiali7157]

From what I understood is that 1)Virtual Memory is NOT what the program sees, the program instead sees virtual address. (Virtual Memory refers to storage cells on DISK, which stores swap files).2) Virtual Address will be translated into Physical address, if there's not enough space on RAM for a certain program, then there'll be unused pages swap out to disk (which is actually what the Virtual Memory refers) to make room for the current running program, (indeed this will be updated on the page table). When the swapped out page are paged back when needed again.

[@thivantran2322]

best series ever sir

[@morgard211]

I'm very greatful for these videos. Thank you, sir!

[@utopianice4574]

These videos are actually PogU Thanks for making them

[@joonlokyap8392]

Thanks for your clear and concise lecture! 😎

[@alopexcheung2525]

Helpful Effective and Awesome !

[@guilherme_viveiros]

Very cleared presentation , rly nice job

[@robituszin]

Amazing video, really helpful. One question: is the MAP (translation) = MMU (Memory Management Unit) ?

[@rootrl6247]

No. it's page table. in next lecture

[@Boxhit98745]

at 0:30 the author says something that I can't understand due to my low English listening skills. Did he mention ISA which stands for Instruction set architecture?

[@floridaman964]

Yes, the MIPS address space is 32 bits. At 0:30 he says "this is what the ISA promises" referring to how each program gets its own virtual memory space (32 bits).

[@yuvaliko]

Perfect. thanks for being so accurate and clear

[@arielsilver7005]

AMAZING video!

[@ashu5214]

MMU is also a kind of Translation unit

[@anamikaahmed4887]

Thank you

[@anigem71]

Nicely explained. Thanks david

[@j.k.notrowling2449]

you saved my life

[@gabrielfriedmann2043]

The mapping table and the information how frequently ram is accessed has to be stored somewhere, too ... isn't this MUCH overhead? Thanks in advance! Gabriel

[@rany615]

it depends on the memory evacuation policy, it can be parallel to other memory accesses

[@harodl6663]

fantastic video

[@mallikarjunfp23]

Great explanation

[@zanyarzohourian9398]

superb! facinating!

[@subee128]

Thank you very much

[@hannahsaseun2381]

This was really helpful Thank you so much

[@timuryalta]

Very nice explanation Where can I find all of topics u covered? Found one more youtube channel with usefull information as well. Prob. some more exist?

[@davidblack-schaffer219]

Timur, please go to test.scalable-learning.com and use the enrollment key YRLRX-25436 to see all the lectures.

[@utpalkant6112]

I need a Data structure course! Can you help with an enrollment key??

[@stupossibleify]

Does the translation only happen if the program selects a segment value it hasn't used recently? Otherwise every memory access will take many more cycles than the couple I might expect from an "ld" opcode

[@hugeturnip3520]

Thank you so so so much

[@kevinsadi5890]

You are a legend

[@tananyAR]

very cleart thanks

[@fuahuahuatime5196]

So... what does this all reside? Like, abstraction is good and all, but if you don't have the understanding of the implementation.... ld r3, 20(r0)

[@wadewang574]

At 3:18, the PA is disk, how to determine the PA is disk, then the Map how to know where is the data in the disk, and the computer hwo to know where is the destination in the RAM to load

[@Sam-ib6xl]

That last question, it actually uses the VM to map to RAM right? itll take the oldest from ram and map that to disk. right?

[@namangupta2228]

dont you think that after incrementig EIP we have to map that address (VA ) to PA .

[@grantpankratz4428]

And here I am as a finance major who just wants to know why my work computer says it has virtual memory. I can confidently say this entire video went over my head. Probably did not help that I started with episode 4.

[@purleedef]

Even if you started on episode 1, he has an entire video series on MIPS that comes before this video series, so this is really like episode 20 in the full series. There's also probably a good bit of prerequisite knowledge you should know to fully understand THAT series. This video is really well explained, but it's definitely not a starting point by any means.

[@Arjunsiva]

Awesome !hats off

[@vortyx090]

Great tutorial :D

[@samahabsi696]

thank so much .....I understood it

[@uyannurbayan2234]

Thnks..

[@awezshaikh2683]

In o to 2^32-1 , in this why '-1'? What is the purpose of it?

[@amallkrishna]

It is because you are starting to count from 0. If you count from 1 to 10 or 0 to 9, you'll have to count till 10 either way. Similarly, 1-2^32 and 0-2^32-1

[@cassandrabailey2428]

you're a godsend

[@Niividaaw25]

awesome ... thank you

[@k0jackdoeverything733]

Thank u, sir, that's amazing

[@bresonable]

You're a legend!

[@mohabmetwally5749]

at 4:21 why R12 has VA 1536 instead of 0 ?

[@brianolsen87]

+mohab mohamed It is 1536 due to the behavior of the MIPS load instruction. ld R3, 0(R12) in plain English would say "Take what is at address location (R12) + 0 and load it into R3". In this case since the value that R12 points to is 1536 the address location would be 1536 + 0. I think you may have thought the 0(R12) means multiply but the parenthesis in assembly work similar to the deference * operator in C/C++.

[@GamersCreedTeam]

Thanks Brian!

[@chezhiyanspartan5080]

thank you sooooooooooooooooooooooooooooooo much

[@aaditya4125]

can anyone explain the answer to the last question

[@firstglance5204]

if the data that the virtual memory needs is too big for the ram(doesnt fit in physical address space) then it will be disk only. On one of the example before that, if its in disk u would put it in physical address space (ram) then grab it from ram everytime but if its too big for ram u always grab from disk

[@s4valueedition802]

can i use 300gb as virtual ram does it make any diffrence

[@rany615]

your computer probably wont use more than a couple

[@tunder.bamidele7434]

how can i download form youtube

[@HelloMyAwesomeName]

This is why I don't like go to the school lol

[@bluex217]

+又日新 To hell with 100''s of thousands of debt for people who can't even explain properly.. I'm self teaching via internet and books..get some certs and launch your career

[@mohabmetwally5749]

+又日新 the same here :) happy learning

[@putrapalguna]

i dont get it

[@shersingh-hv8pd]

tooo good

[@nathanupfold3694]

does it make a difference to gaming if I upgrade my virtual ram?

[@rany615]

probably not , just get more ram

[@rany615]

or faster ram , or faster hdd

[@nufaeilaziz5432]

i feel like a nerd watching this..........

[@mariamzayed91]

💖💖💖🥺❤️

[@frankynakamoto2308]

Ram is not physical memory And virtual memory is wrongly explain, is explained intentionally wrong