Solana: How can a rust program get access to the `syscall_base_cost` value?

Access to budget values ​​in rust

When building a Solan program, one of the key elements is the calculation budget that determines the cost of executing the instructions. In this article, we will look at how to gain access to specific values ​​according to the calculation budget using Rust.

SystemcallbaseCost value

The value “syscall_base_costrepresents the basic cost of calling the system in Solan. This value determines how much gas is needed to make a system connection. Although it is not directly available outside the program, it can be obtained softly with the help of SDK Solana.

Here is an example fragment of the code that configures the default calculation budget with some sample values:

Rust

Use solana_program :: {

Conct_info :: {next_account_info, conctinfo},

Ententpoint :: programs,

Exec_info :: {SELF, Programmid, Entrypointentry, Entrypointer}.

Program_error :: Printerror,

Pubkey :: Pubkey,

};

Use Std :: Collections :: Hashmap;

// Determine the calculation budget

Const compute_budget: & mut hashmap , u64> = {{{{

Let the budget mut = hashmap :: new ();

budget.InSert (Next_account_Info (). Pubkey, 100_000); // 100k gas to prepare

budget.InSert (Next_account_Info (). Pubkey, 50_000); // 50K gas to create transactions

};

Access to Budget Value for Calculation

To access specific values ​​according to the calculation budget, you can use the “Get” method provided by the implementation “HashMap”. For example:

`Rust

FN Main () -> Programresult {

// Get the calculated costs to make a system connection

Let syscall_base_cost = budangd.get (& next_account_info (). Pubkey)?;

Println! ("Basic price of syscall: {}", syscall_base_cost);

// Get the total calculation costs to create an account

Let Account_Create_cost = budget.get (& next_account_info (). Conct_pubkey)?;

Println! ("Creating Account: {}", Account_Create_cost);

// Get the minimum price required for a system connection calculation

Let min_syscall_cost = budget.get (& Next_account_info (). Pubkey)?. Min ()?;

Println! ("Min. Price of syscall: {}", min_syscall_cost);

}

An example of use cases

Here’s an example of how you can use these values ​​to optimize the program:

• When performing a system call, make sure that syscall_base_cost is more bigge.

• If creating a transaction requires more gas than available in the calculation budget, consider using a separate account with higher gas limits.

best practices

To ensure safe and effective use of budget calculation values:

• Follow the remaining budget for calculating regular intervals.

• Before you make system connections, check syscall_base_cost to avoid exceeding the minimum price required.

• Use separate accounts or contexts of sensitive calculations that require more gas than available in the calculation budget.

Following these guidelines and using SOLANA SDK, you can effectively manage budget calculation values ​​under the Rust program.

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