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Ethereum: What is the maximum amount of memory available for a smart contract?
Understanding the limitation of the intelligent memory of the Ethereum contract
When building an intelligent contract on Blockchain Ethereum, one of the key aspects to consider is the allocation of memory. In particular, the maximum amount of memory available to an intelligent contract can be a significant challenge in some scenarios.
In this article, we delve into the details of how the Ethereum virtual machine (EVM) limits the size of variables and memory functions that can be used as part of an intelligent contract.
EVM memory limits
EVM has several memory -related restrictions:
- variable : The maximum length of the unigned 256-bit number variable is 20 bytes.
- Storage functions
: There are two types of memory functions in EVM: `
Bajte 'i‘ String ‘. The “byte” function can store up to 1 073 741 824 bytes (1024^3). On the other hand, the “String” function has a maximum length of 2^256 – 1 bytes.
using variable mapping
In the example code, a fragment:
`Solidity
mapping (uint256 => string) public random;
You use variable mapping for storing strings. The problem is that each variable in the “Randomentries” table can only withstand up to 20 bytes of memory, according to the limitation of the variable EVM.
adding strings of variable length
Suppose you want to add a 1024 byte string to your mapping:
`Solidity
mapping (uint256 => string) public random;
for (uint256 i = 0; i <10,000,000; i ++) {
Randommentria [i] = "
}
In this scenario you can add a large number of strings with variable lengths up to 20 bytes each. However, when the total memory consumption exceeds the EVM limit, things become problematic.
consequences of exceeding memory limits
When you try to store a string with more than 20 bytes in mapping “Randomentries”, you will encounter a mistake:
`
Error: exceeded memory size (max.: 1 073 741 824, min: 0)
`
This is due to the fact that EVM cannot assign sufficient memory for a variable with a length of 1024 bytes.
Application
Although it is possible to store large strings in the Ethereum Smart Contracts using variable mapping and memory function “bytes”, there are restrictions on how much memory can be allocated. To avoid errors such as the above, you need to make sure that the code has been designed for EVM memory limits. This may include:
- Breaking large strings into smaller pieces
- Using ‘String’ instead of ‘Bajte’
- Implementation of buffering or other optimization techniques
In summary, it is necessary to understand EVM memory limits and thoroughly plan data storage while building Ethereum Smart Contracs.
Additional resources
For more information on EVM memory restrictions, check the following resources:
- Ethereum virtual machine documentation (EVM): <
- Solidity 0.5.12 Documentation: <
- EVM Ethereum tutorial: <