Internet Computer Association

DFINITY Foundation

Synapse.vote (formerly ICP Maximalist Network)

Arthur’s Neuron (used to be cycle_dao)

ICDevs.org

CryptoIsGood

Anvil

ICPL.app

The Fools' Court

ysyms

The Accumulators’ Neuron

RawTech Venture

Paul Young

ICPMANUAL

8yeargangDAO

John Wiegley

Isaac Valadez

Krzysztof Żelazko

Always Rejects

Nicolas.ic

Smaug’s Neuron for Retail Investors



# Background
The Wasm heap of canisters is limited to 4GiB. The limit is fundamental and
cannot be increased because of 32-bit memory addresses. If a canister uses all
of the available heap space, it will start producing out-of-memory errors and
may stop working, which could lead to data loss and bricking of the canister.
The developer may not realize this until it is too late to fix the issue.

# Proposal
This proposal aims to introduce an explicit Wasm heap limit that can be
configured in the canister settings. The default value for this limit will be a
conservative amount, such as 3GiB. If a canister tries to use more memory than
the limit, it will receive an out-of-memory error. This will alert the developer
to the potential memory issue and allow them to safely upgrade the canister to a
version that uses less memory.

# Details
Add a new wasm_heap_limit field to canister settings with the default value of 3GiB.
Change the implementation of memory.grow() to check the limit. The operation
traps if growing the memory would exceed the limit.

# What are we asking the community
- Vote accept or reject on NNS Motion.
- Participate in technical discussions as the motion moves forward.



Motion for Configurable Wasm Heap Limit