Struct Snapshot 

pub struct Snapshot {
    pub read_syscalls: Option<u64>,
    pub write_syscalls: Option<u64>,
    pub bytes_through_read: Option<u64>,
    pub bytes_through_write: Option<u64>,
    pub bytes_from_device: Option<u64>,
    pub minor_faults: Option<u64>,
    pub major_faults: Option<u64>,
    pub page_faults: Option<u64>,
    pub pageins: Option<u64>,
    pub total_syscalls: Option<u64>,
    /* private fields */
}

Kernel-reported counters at one instant or across one delta.

Fields

read_syscalls: Option<u64>

read-family syscalls, available from Linux procfs.

write_syscalls: Option<u64>

write-family syscalls, available from Linux procfs.

bytes_through_read: Option<u64>

Bytes read through the syscall layer, including page-cache hits (Linux).

bytes_through_write: Option<u64>

Bytes written through the syscall layer (Linux).

bytes_from_device: Option<u64>

Bytes actually fetched from a block device (Linux).

minor_faults: Option<u64>

Minor page faults reported by Linux procfs.

major_faults: Option<u64>

Major page faults reported by Linux procfs.

page_faults: Option<u64>

Total page faults reported by macOS.

pageins: Option<u64>

Page-ins reported by macOS.

total_syscalls: Option<u64>

Total Mach and Unix syscalls reported by macOS.

Implementations

impl Snapshot

pub fn now() -> Self

Read the current platform’s supported process counters.

Sampling never fails the observed operation. An unavailable kernel interface yields an empty snapshot whose renderer states that no source was available.

pub const fn source(&self) -> Option<Source>

Which kernel interface supplied this snapshot.

pub const fn is_available(&self) -> bool

Whether at least one supported kernel source was available.

pub fn since(&self, earlier: &Self) -> Self

This snapshot minus an earlier one: work performed between the samples.

pub fn cache_hit_ratio(&self) -> Option<f64>

Share of syscall-layer read bytes served without block-device reads.

pub fn render(&self) -> String

Render only the metrics supported by this snapshot’s source.

Trait Implementations

impl Clone for Snapshot

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Snapshot

impl Debug for Snapshot

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

Formats the value using the given formatter.

impl Default for Snapshot

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Snapshot

impl PartialEq for Snapshot

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Snapshot