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Native Rust · hard

23. Native Rust: Zero-Copy with RefCell & Pointer Casting

Avoiding memory allocations for large accounts.

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For large accounts (e.g. 100KB orderbooks), deserializing the entire buffer via Borsh exceeds SBF heap memory (32KB). Native zero-copy borrows the `data` slice directly and casts pointers using `bytemuck` or `zerocopy`.

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Check your understanding

  1. 1. Why does standard Borsh deserialization fail on very large accounts on Solana?

  2. 2. What crate is commonly used to safely cast raw byte slices to structs in zero-copy?

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