在Solana的链上程序中，有什么方法可以增加计算单元吗

Question

我在开发索拉纳的链上程序时出错，超过了计算单元的最大单位。有没有办法增加最大计算单位？

Answer 1

您可以参考索拉纳食谱中的本教程。

请注意，您必须将第一条指令作为设定预算的指令。

Typescript的示例片段：

const data = Buffer.from(
Uint8Array.of(0, ...new BN(256000).toArray("le", 4))
);
const additionalComputeBudgetInstruction = new TransactionInstruction({
keys: [],
programId: new PublicKey("ComputeBudget111111111111111111111111111111"),
data,
});
const transaction = new Transaction()
.add(additionalComputeBudgetInstruction);

Answer 2

如果使用solana-program-test测试应用程序，则可以使用set_compute_max_units()设置更高或更低的计算单元，即：

use solana_program_test::ProgramTest;
use crate::id;
use crate::processor::process_instruction;
let mut pt = ProgramTest::new("my_program", id(), processor!(process_instruction));
pt.set_compute_max_units(5_000_000);

完整示例位于https://github.com/solana-labs/solana-program-library/blob/78e29e9238e555967b9125799d7d420d7d12b959/token/program/tests/assert_instruction_count.rs#L24

对于solana-test-validator，目前不支持此功能，但欢迎PR！

Answer 3

1.9.2及更高版本的SDK确实对增加(或降低(计算预算和堆大小进行了更改。在sdk/src/compute_budget.rs中的茄属植物中https://github.com/solana-labs/solana/blob/master/sdk/src/compute_budget.rs#L35

这应该适用于本地测试，但尚未为devnet、mainnet beta等启用。

它的工作方式是创建一条request_units指令，并将其放在事务中的第一条指令：

/// Submits the program instruction as per the
/// instruction definition
fn submit_transaction(
rpc_client: &RpcClient,
wallet_signer: &dyn Signer,
instructions: Vec<Instruction>,
) -> Result<Signature, Box<dyn std::error::Error>> {
let mut transaction =
Transaction::new_unsigned(Message::new(&instructions, Some(&wallet_signer.pubkey())));
let recent_blockhash = rpc_client
.get_latest_blockhash()
.map_err(|err| format!("error: unable to get recent blockhash: {}", err))?;
transaction
.try_sign(&vec![wallet_signer], recent_blockhash)
.map_err(|err| format!("error: failed to sign transaction: {}", err))?;
let signature = rpc_client
.send_and_confirm_transaction(&transaction)
.map_err(|err| format!("error: send transaction: {}", err))?;
Ok(signature)
}
/// 
fn foo() {
// Other details omitted
let accounts = &[];
let instruction = Instruction::new_with_borsh(PROG_KEY, &0u8, accounts.to_vec());
let bump_budget = ComputeBudgetInstruction::request_units(400_000u32);
let txn = submit_transaction(
&connection,
&main_payer,
[bump_budget, instruction.clone(), instruction.clone()].to_vec(),
);

请注意，在日志输出中，第3行和第7行中的每条指令都有一个缩编：

[2022-02-05T09:08:49.715294000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc invoke [1]
[2022-02-05T09:08:49.715522000Z DEBUG solana_runtime::message_processor::stable_log] Program log: process_instruction: PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc: 0 accounts, data=[0]
[2022-02-05T09:08:49.715551000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc consumed 12843 of 400000 compute units
[2022-02-05T09:08:49.715675000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc success
[2022-02-05T09:08:49.723680000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc invoke [1]
[2022-02-05T09:08:49.723818000Z DEBUG solana_runtime::message_processor::stable_log] Program log: process_instruction: PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc: 0 accounts, data=[0]
[2022-02-05T09:08:49.723837000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc consumed 12843 of 387157 compute units
[2022-02-05T09:08:49.724017000Z DEBUG solana_runtime::message_processor::stable_log] Program PWDnx8LkjJUn9bAVzG6Fp6BuvB41x7DkBZdo9YLMGcc success