Why the compiled sbf file size is varied so much? #6194

MaeThird · 2025-05-10T06:49:36Z

MaeThird
May 10, 2025

After my test this code snippet

    let create_account_ix = system_instruction::create_account(
         payer.key,
         pda.key,
         lamports,
         space,
         owner_program.key,
     );

occupies 44K while if changed into this

    let mut data = vec![0u8, 0u8, 0u8, 0u8]; 
    data.extend_from_slice(&lamports.to_le_bytes());
    data.extend_from_slice(&space.to_le_bytes());
    data.extend_from_slice(&owner_program.key.to_bytes());
    let create_account_ix = Instruction {
        program_id: system_program::ID,
        accounts: vec![
            AccountMeta::new(*payer.key, true), // Funding account (signer)
            AccountMeta::new(*pda.key, true),   // New account (signer)
        ],
        data,
    };

it takes < 4K.The total deploy fees can reduce from 0.58 sol to 0.19 sol. The sbf compiler is

/cargo-build-sbf --version
solana-cargo-build-sbf 2.1.21
platform-tools v1.43
rustc 1.79.0

The total size of former is 68K , the later is 26K. And in this 26K sized elf file there are about 13K .txt data which is not comes from process_instruction. I checked the default compiler flags set by cargo-build-sbf is -C opt 3 which means speed first.

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Why the compiled sbf file size is varied so much? #6194

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Why the compiled sbf file size is varied so much? #6194

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MaeThird May 10, 2025

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MaeThird
May 10, 2025