Is there a way to introspect canister size / limits from Motoko at the moment?

Hi Hazel, There no official library at the moment, but if you are desperate, and with the caveat that these APIs may change, there’s some basic stats provided but the Prim (pseudo) library: rts_version : () -> Text rts_memory_size: () -> Nat; rts_heap_size: () -> Nat; rts_total_allocation: () -> …

Thanks @claudio ! This is perfect! Noted the instability, this works just fine for my hacks / POC stuffs.

@claudio can you please describe what those getters really mean? I could not find any comments in the source code about what kind of bytes those functions corresponds to. What is rts_memory_size() and is it correlated with “Memory Size” mentioned in dfx canister status <canister> output? Wha…

I think Andreas just answered most of them in Motoko, Array, Memory - #5 by rossberg

As an aside, what does RTS stand for?

[image] jzxchiang: RTS Run time system. Think of it as all the code that’s included in the resulting wasm module, but that you didn’t write nor import via modules, that comes with the compiler and that is (roughly) the same for all Motoko canisters. It contains, among other things, the garbag…

RTS is short for Run Time System and typically refers to infrastructure supporting program execution such as garbage collection, serialisation and low-level system calls.

Are these those refs: motoko/prim.ml at master · dfinity/motoko · GitHub

[image] alexeychirkov: rts_total_allocation Did you ever figure out what rts_total_allocation is? I see it keeps growing in my logs

Motoko - Get Canisters Sizes / Limits

Developers

alexeychirkov January 30, 2022, 10:37am 11

Answer is here

Topic		Replies	Views
View canister storage usage? Developers	1	623	August 13, 2021
Canister Memory Management & Data Memory Requirements Developers	1	50	April 25, 2025
Will the 4GB heap size limit ever be increased? Developers	3	913	May 30, 2023
Where I can find rts_* methods documentation? Motoko	1	286	October 11, 2023
Proposal: Help prevent canister heap overflow by adding heap_memory_size to canister_status Developers Discussing	5	370	March 31, 2024

Motoko - Get Canisters Sizes / Limits

Related topics