Struct Statistics

pub struct Statistics { /* private fields */ }

Used to collect statistics of the WasmEdge runtime, such as the count of instructions in execution.

Implementations

impl Statistics

pub fn new() -> WasmEdgeResult<Self>

Creates a new Statistics.

Error

If fail to create a Statistics, then an error is returned.

pub fn count(&self) -> u64

Returns the instruction count in execution.

pub fn count_per_second(&self) -> f64

Returns the instruction count per second in execution.

Notice

For the following cases,

• Statistics is not enabled, or
• the total execution time is 0

The instructions per second could be NaN, which represents divided-by-zero. Use the is_nan function of F64 to check the return value before use it, for example,

use wasmedge_sdk::Statistics;

// create a Statistics instance
let stat = Statistics::new().expect("fail to create a Statistics");

// check instruction count per second
assert!(stat.count_per_second().is_nan());

pub fn cost(&self) -> u64

Returns the total cost in execution.

pub fn set_cost_table(&mut self, cost_table: impl AsRef<[u64]>)

Sets the cost of instructions.

Arguments

• cost_table specifies the slice of cost table.

pub fn set_cost_limit(&mut self, limit: u64)

Sets the cost limit in execution.

Arguments

• limit specifies the cost limit.

Trait Implementations

impl Clone for Statistics

fn clone(&self) -> Statistics

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Statistics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.