How many cores does a minecraft server use efficiently

[Anjelllo]

Just wondering what those big servers with 200+ Players are being run on. On the wiki it says minecraft supports multiple cores, but how many? I've heard it only takes advantage of 3 but others say it can take up as many as you throw at it. Anyone with experience wanna explain? Also, how much ram does it take up(for a 200 player survival or minigame server)? 

[manikyath]

one core. the entirety of the tick handling is trough one thread.

all that remains past that in terms of cpu usage is stuff that java is doing, or the network threads.

 

as for those 200 player servers, they either lag to shreds, or are running custom software.

[Anjelllo]

1 minute ago, manikyath said:

one core. the entirety of the tick handling is trough one thread.

all that remains past that in terms of cpu usage is stuff that java is doing, or the network threads.

 

as for those 200 player servers, they either lag to shreds, or are running custom software.

Thanks! Know what kind of software they are using?

[Lurick]

https://minecraft.gamepedia.com/Server/Requirements/Server

and

https://www.planetminecraft.com/blog/minecraft-servers-require-more-than-you-think-hardware-requirements/

[manikyath]

Just now, Anjelllo said:

Thanks! Know what kind of software they are using?

custom.

 

as in, they take a developer, give him coffee and a computer, and shower him in money.

[Anjelllo]

3 minutes ago, manikyath said:

custom.

 

as in, they take a developer, give him coffee and a computer, and shower him in money.

Ah, ok lol

[Enderman]

I've seen my modded servers use all 8 threads of my CPU, vanilla only 4.

[manikyath]

Just now, Enderman said:

I've seen my modded servers use all 8 threads of my CPU, vanilla only 4.

use them, or use them efficiently?

 

[Enderman]

2 minutes ago, manikyath said:

use them, or use them efficiently?

 

One core is usually higher than the others at idle, but all usually sit at pretty low usage since the 4790k has good single core performance.

If you do intensive stuff on the server, for example removing water from a quarry, having tons of entities, etc. all the cores spike to pretty high usage, not just one.

 

I see this question asked pretty often, maybe I should do a youtube video on the topic to demonstrate

Problem is I have no way of checking if modded can use more than 8 threads.

[manikyath]

Just now, Enderman said:

One core is usually higher than the others at idle, but all usually sit at pretty low usage since the 4790k has good single core performance.

If you do intensive stuff on the server, for example removing water from a quarry, having tons of entities, etc. all the cores spike to pretty high usage, not just one.

 

I see this question asked pretty often, maybe I should do a youtube video on the topic to demonstrate

Problem is I have no way of checking if modded can use more than 8 threads.

i'll tell you how i can give you a way to check:

 

all the functional bits of a minecraft server are written and executed in a single thread, this is done with purpose, and this will most likely never change.

[Enderman]

2 minutes ago, manikyath said:

i'll tell you how i can give you a way to check:

 

all the functional bits of a minecraft server are written and executed in a single thread, this is done with purpose, and this will most likely never change.

No, it's been a while since they enabled multithreading, now stuff like chunk loading, redstone ticks, entity movement, etc. are divided up into separate threads when possible.

[ARikozuM]

The most I've seen a Minecraft server use was four threads on my Steam server. Usage was low (~20%), but higher than idle (10%). 

 

Note: I don't play Minecraft and just followed a guide on setting up a Minecraft server. 

3 minutes ago, Enderman said:

No, it's been a while since they enabled multithreading, now stuff like chunk loading, redstone ticks, entity movement, etc. are divided up into separate threads when possible.

Interesting. Is this only for servers or for the game as well? 

[manikyath]

Just now, ARikozuM said:

nteresting. Is this only for servers or for the game as well? 

clientside a lot of the rendering is handled in seperate threads, on the serverside, i've yet to see any sort of indication of multiple threads doing what you'd expect of multiple threads, with about 97% of total cpu usage coming from a single thread.

[Enderman]

3 minutes ago, ARikozuM said:

Interesting. Is this only for servers or for the game as well? 

They have updated the client to run a sort of "internal server" so that when playing singleplayer it basically runs both the client and server at the same time, also allowing the game to use more cores. Just like when running the standalone server.

 

When using the client to connect to a remote server, I cant remember if it is limited to one core.

[Staidey]

On 8/19/2017 at 10:40 AM, Anjelllo said:

Just wondering what those big servers with 200+ Players are being run on. On the wiki it says minecraft supports multiple cores, but how many? I've heard it only takes advantage of 3 but others say it can take up as many as you throw at it. Anyone with experience wanna explain? Also, how much ram does it take up(for a 200 player survival or minigame server)? 

i think you need a good one core perfomance cpu