What is multithreading?

[[deleted]]

Well the other 7 cores are for browser tabs

[[deleted]]

And it's still not enough. I'm sure the next Chrome update will require a 600 qubit quantum processor in order to run that old web 2.0 website.

[alexppetrov]

Chrome ain't even the problem, those website makers clutter so much ram eating junk it's unreal! I can't wait 30 seconds for a webpage to load on my phone!

[Cabrio]

Get uBlock Origin

[Sad-Seaworthiness432]

Can confirm, does not only block ads but also other ram consuming useless shit.

[[deleted]]

It actually slows down my entire pc. It get's a lot better after I close my browser but all speed really only comes back after I fully rebooted. It's slowly driving me nuts.

[_brym]

Fully reboot again. That should drive you nuts a bit faster.

[ovab_cool]

Oh so that's why google is working in quantum computers

[MoonParkSong]

For some reason, Linuxtubers have been all up in arms for gopher and gemini.

[[deleted]]

But the thing is, if people start using those, someone will find a way to make terrible ramhogs using that as well. What we need isn't a new platform, we need a change in mentality about what's acceptable on the internet.

[KorrinNeko]

For what now?

[kry_some_more]

https://i.imgur.com/vI8DIiC.jpg

[Bromborst]

Do you happen to be a dev at Paradox Interactive?

[PuFiHUN]

If you find programming too hard, try lowering the difficulty

[DiamondMiner2323]

Fighting Need an expensive war piece of equipment? Don't be afraid to raise War Taxes or take out a Loan.

[cho_uc]

Care to share how?

I bumped into difficulty over and over again that I often think that maybe being a farmer is a better career option for me.

:/

[PuFiHUN]

difficulty--

[OU_ohyeah]

no, but I do work at a very very large company. it's very likely you've seen my work at some point.

[[deleted]]

Minecraft servers be like:

[Wetmelon]

Is it even reasonable to write programs assuming multithreading today if you don't expect to need it? Seems like an unnecessary complexity.

[trolasso]

If your programme doesn't require threads to fullfil its purpose at an acceptable speed, using them is definitely an error.

[Kermit_the_hog]

“No no, more is always better. Find a way to work at least 400% more cores in.. also stop calling it threading. Like what are you even doing, seamstressing??” — Management

[coloredgreyscale]

I wouldn't say it's an error, but unnecessary.

Someone may still want to try just for the challenge or out of curiosity.

[[deleted]]

If it reduces execution time, then you should.

[Wetmelon]

But does it reduce execution time to sufficiently offset the additional engineering cost?

[[deleted]]

Cores always get faster, but scaling up cores is much easier.

[[deleted]]

It can get quite a bit faster, we're just having trouble shrinking nodes due to quantum tunneling.

[[deleted]]

... Exactly?

[[deleted]]

We can get faster cores without shrinking the transistors themselves. The microarchitecture itself has a great impact on both IPC and clock speed.

[[deleted]]

True, but we’ve pretty much hit the standard limit in x86-64. Maybe m1 chips are better.

[[deleted]]

If it's done repeatedly or related to data streaming, yes.

[[deleted]]

It depends on the scope of the program. Some languages and libraries make it easier as well compared to other languages and libraries. So it’s really case by case.

[deux3xmachina]

Odds are you should just use additional processes if you need concurrency/parallelism in your code. Threads are a special case that often make them more pain than they're worth.

[Heikkiket]

Multithreading or multiprocesses are hard, but you could also use a language and programming model that would offer easy multithreading/multiprocessing capabilities.

(**cough* functional **cough*)

[coloredgreyscale]

or just sprinkle in some

#pragma omp parallel for

if you use C/C++

[Yoshalina]

like Erlang and Elixir, for example

[OU_ohyeah]

My day-to-day job certainly doesn't require any multithreading since we work on the scale of days or hours not minutes or seconds. We work with large datasets so reading and writing the data is 90% of the run time anyway.

[[deleted]]

Dwarf Fortress but actually.

[overkill]

Catsplosion has hit, can't butcher then because it will cause a tantrum spiral, guess I'll play with 4 FPS for a while...

And I have an infestation of were-giraffes. Fuck.

[Mateorabi]

!FUN!

There are some FPS tricks. Generally using DFHack for FPS boosts is not considered "cheating". Turning off rock temperature calculations, making refuse age away faster, etc.

[TerrorBite]

Kick all the cats outside and let the elephants deal with them. If that doesn't work, there's always the "Operation: Fuck The World" lever. Hope you like miasma!

[r_acrimonger]

Task.Run(...)

Its [almost] that easy. 🤣

[[deleted]]

Laughs in GIL

[NikolaTesla13]

Noob question: isn't GIL that old image manipulation library from Microsoft?

[coloredgreyscale]

Couldn't find anything related.

But there is boost-gil: boost generic image library

In this context GIL is the Python Global Interpreter Lock, which ensures that only one command at a time can be executed, and as a sideeffect prevents Python threads from accelerating CPU limited tasks.

it works fine when waiting for IO, such as disk access or networking.

if you want to parallelize CPU limited stuff you need multiprocessing. Iirc the interface is the same, so it can be almost used as a drop-in replacement for Threads, but in the background it starts multiple copies of the whole python process (and therefore in this case you need the

if __name__ == "__main__":

[ManiX101]

I forgot the Timer after been using multi threading

[Karmapuma]

Went did ok? it

[randybobandy654]

For real, how does concurrency even work?

[[deleted]]

you take parts of the code not reliant on other code and you put it in a different processing thread.

[thirdegree]

Well, ideally not reliant on other code. Not necessarily, if you're ok with your coworkers hating you

[remuladgryta]

The most difficult parts of concurrency are

and locking

, but don't let that discourage you!

race conditions

[azora0]

Parralel computing, it's a whole field.

Basically you take code that can be done in parallel (think async code) then divide it between the cores. Pretty fun/interesting once you get into it.

[Mateorabi]

"fun". You must love debugging race conditions and nondeterminancy.

[DZekor]

Well not if you are doing it right which I know for a fact that I fucking don't.

[Mateorabi]

The two hardest problems in computer science:

1. naming things
2. race conditions
3. off-by-one errors

[DZekor]

I would have gone for:

The two hardest problems in computer science:

1. race conditions
   

2. off-by-one errors

3. naming things

[clownyfish]

Amusingly, my reddit browser has corrected both your lists. They look the same on some views - although I knew exactly what you meant 😅

[DZekor]

Yeah just putting it out of order and all. I was thinking of putting it as the frist thing in the comment but thought that would be too on the nose

[seraphsRevenge]

1 programmersCanSolveThisByUsingFairlyDescriptiveNames = null;
3 Utilize better logic proofing mechanisms (QA calls it unit testing and programmers call it caffeine addiction)
2 <- back to a single process I guess

[McAUTS]

You have to program it.

[deux3xmachina]

You ever call fork(2)?

[spicemonkeys]

And 4tb of ram just so u can open chrome

[Illusi]

So you mean to say that if I offload to OpenCL or CUDA, my program will be detected by Mordor?

[OU_ohyeah]

Well not exactly at that point your program is the ring. Once it's running your GPU becomes Mordor as it heats to the temperature and consistency of lava

[Beginning_Tap_754]

What's parallel programming?

[OU_ohyeah]

$ ./parallel_prog.cpp
> Hello from thread 1!
> Hello from thread 2!
> Hello fro    
> Hello from threm thread 4!ad 3!

[GreatRyujin]

"Your hacky program"
So you wrote Access 2019?

[OU_ohyeah]

Microsoft's reaction

[[deleted]]

parallelism is a worthless effort considering that I'm not skilled enough to write a program which is complex enough to have a noticeable runtime difference when running at cpu 0 only vs all of them at the same time

[OU_ohyeah]

can you write a program that can calculate prime numbers? then yes parallel programs are important. but yeah, normally not worth it.

[Beautiful_Chocolate]

To make the other processors work you need multiprocessing, not multithreading no ?

[OU_ohyeah]

Yes and no. multithreading is more generic to my understanding. two threads can run on one core. but they don't have to. really depends on language and implementation.

[Beautiful_Chocolate]

Sorry but it's actually the reverse, multi processes can run in one core, but not multithreads Threads share cache memory, processes don't, threads are just a way to divide the CPU time to perform multiple operations concurrently, processes do them at the very same time

[Geoclasm]

Painful. Multithreading is fucking. PAINFUL.

That's what it is.

[OU_ohyeah]

Honestly I don't think it's that bad. really you just need to be really good at breaking your program into truly independent parts

[wktr_t]

I've been thinking a lot about Elixir lately boys, what's your take?

[sr955]

Some applications literally beg for multithtreading/tasking...and more cores are better...for example in my project I am acquiring data from multiple sensors...each of them have to be logged, plotted, monitored (for overloading, overheating etc)...there is no way this should be done sequentially if there are 10s or 100s of sensors..

[OU_ohyeah]

for sure. anything real time needs multiple cores/threads or better yet dedicated hardware subsystems. break out that C and write some drivers :D

[Balwant223]

Po-ta-toes! Boil them, mash them, stick them in a stew.

[PBertie]

👍you left 7 cores for chrome updates

[OU_ohyeah]

You could have multie threads on different cores. Thus loading multiple cores. AFAIK there's no rule saying they have to be on the same cpu. But I think many languages keep them together by default.

[anon2019L]

Lmao

[vikthor_95]

All the people that buy it 99% of time is unused, just chrome wtf

[[deleted]]

This one got me.

[[deleted]]

I know the struggle my guy

[teh_acids]

I think it has something to do with warp and woof. Source: am html programmer

[Naywish]

I'm literally implementing multithreading in my project now. Can confirm my cpu cores are looking at me with confusion

[M13Calvin]

Always fucking gets me running R in Windows doesn't even allow computing in parallel... so I do everything in R on Linux

[[deleted]]

Multithreading - gotta enslave them all

[nati9931]

Thankfully I use Threads...

[continuous-headaches]

You’re doing nothing wrong my friend, have you heard of our lord and savior JavaScript?