Obtaining access to calculating budget rust values
In the construction of the Solana program, one of the critical components is the calculation budget that determines the cost of implementing the instructions. In this article, we will study how to access specific values within the calculation budget using Rust.
VALUE SYSTEMCALLBASECOST
The value syscall_base_cost is the main price of the system call in Solana. This value determines how much gas is required to perform a system call. Although not directly accessible outside the program, it can be obtained programming with the help of SDK Solana.
Here’s an example of a code fragment that sets a default calculation budget with some sample values:
`Rust
Use Solar_program :: {
Account_info :: {next_account_info, continfo},
Entrypoint :: Programresult,
Exec_info :: {SELF, Programid, Entrypointntry, Entrypoinror}.
Program_error :: printer,
Pubkey :: Pubkey,
};
Use Std :: Collections :: Hashmap;
// Determine the calculation budget
Const compute_budget: & mut hashmap
Let the budget move = hashmap :: new ();
budget.InSert (Next_account_Info (). Pubkey, 100_000); // 100k gas gas
budget.InSert (Next_account_Info (). Pubkey, 50_000); // 50K gas to create a transaction
};
Access to Budget values for calculation
To access specific values within the calculation budget, you can use the method “Get a method offered by applying” HashMap “. For example:
`Rust
FN Main () -> Programresult {
// Get the costs calculated to perform a system call
Leave syscall_base_cost = budget.get (& Next_account_info (). Pubkey)?
Println! ("Basic cost of costs: {}", syscall_base_cost);
// Get the total cost of creating an account
Leave Account_Create_cost = budget.get (& Next_account_info (). Account_Pubkey)?
Println! ("Creating Account Cost: {}", Account_Create_cost);
// Get the minimum calculation cost required for a system call
Leave Min 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 your program:
- When performing a system call, make sure that
syscall_base_costis more or less or equal to the minimum cost of calculation required for the respective instruction.
- 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 calculation budget left at regular intervals.
- Check `syscall_base_costa before executing system calls to avoid exceeding the minimum required costs.
- Use separate accounts or contexts for sensitive calculations that require more gas than is available in the calculation budget.
Following these instructions and the use of SDK Solana, you can effectively manage the calculation budget values in your Rust program.