Struct Psi 

pub struct Psi {
    pub cpu: PsiResource,
    pub memory: PsiResource,
    pub io: PsiResource,
    pub irq: PsiResource,
}

Host pressure stall information.

Why this exists on top of CPU% and load average

Neither of those answers “is the machine actually struggling”. A box at 90 % CPU with nothing waiting is busy but healthy; a box at 30 % CPU with an io full average of 40 % is making every process wait on the disk, and both CPU% and load average look unremarkable while it happens. PSI is the kernel’s own answer to “how much time did work actually lose”, and it is the one number that distinguishes the two cases.

Fields

cpu: PsiResource

memory: PsiResource

io: PsiResource

irq: PsiResource

Implementations

impl Psi

pub fn any_present(&self) -> bool

Whether any resource was readable. A Psi where nothing is present is worse than None: it draws three empty bars that look like an idle machine instead of an absent feature.

pub fn rows(&self) -> [(&'static str, PsiResource); 4]

The resources in display order, with their labels.

Trait Implementations

impl Clone for Psi

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 Psi

impl Debug for Psi

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

Formats the value using the given formatter.

impl Default for Psi

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Psi

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Psi