revi Comments - Answer Overflow

if I'm not mistaken, entities are tiny in memory. A high number may cause TPS drops, but they don't require any significant amount compared to chunks.

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

so I'll need to identify these classes or packages more precisely before measuring how much memory they're using

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

loaded chunks are for sure more than 53% of the heap, but these are represented by different classes from net.minecraft.world.level.chunk and io.papermc.paper.chunk (and probably others)

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

bigger in memory?

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

hopefully these are regular in size 🤞

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

if you like a different approach, let's find how much memory is consumed per chunk or entity and then multiply

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

that's what happens with servers over 9-12 GiB, when GC hits you hard and may need to tune your flags based on really custom needs

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

you can tune your GC configs or even use a different GC implementation, but I'm trying to find something that works for 90% of use cases.

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

but that happens regularly, you can ignore that for a quick capacity planning

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

and entities and chunks are closely related to player counts, as chunks aren't active if no one is there

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

the server can always have a huge farm with thousands of entities, slowing everything down and making frequent memory changes. but thinking about entities and chunks will give you a good estimate, as that's what causes ~90% of the memory increase when more users join the server.

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

If people find this interesting, I'll try to also measure the impact of adding common plugins. Some of them require an almost fixed amount of memory, regardless of users. Others scale with the size of the map, and others with number of users. Others are virtually free in terms of memory.

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

but this is just memory, servers with 100+ users will probably hit longer ticks first (due to single CPU constraints)

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

mostly because of JVM pauses, but we could find a more or less general formula that will work for < 9-12 GiB use cases

73 replies

AAdmincraft

•Created by revi on 6/18/2023 in #questions

How much memory for 10 online users on a PaperMC server

I'd expect a trend change when hitting ~12 GB of memory usage

73 replies

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