procstat

package

v0.69.0 Latest Latest Go to latest Published: Nov 1, 2026 License: BSD-3-Clause Imports: 7 Imported by: 0

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Valid go.mod file
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Repository

github.com/go-fleettools/fleettools

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Documentation ¶

Overview ¶

Package procstat reads and compares two readings of a Linux /proc/stat: how busy the CPUs were between them, and which are the idlest. It is the one home of that arithmetic, shared by cmd/hostload (which reports it) and cmd/abbench (which refuses to start a round on a loaded host).

Index ¶

func Pick(cs []CPUUse, k int) string
type CPUUse
- func PerCPU(a, b Snapshot) []CPUUse
type Snapshot
- func Parse(data []byte) (Snapshot, error)
- func ReadFile(path string) (Snapshot, error)
type Times
type Usage
- func Between(a, b Times) Usage

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Pick ¶

func Pick(cs []CPUUse, k int) string

Pick returns the k idlest CPUs as a taskset list, "3" or "3,6,4".

Types ¶

type CPUUse ¶

type CPUUse struct {
	ID   int
	Busy float64
}

CPUUse is one CPU's busy fraction over the interval.

func PerCPU ¶

func PerCPU(a, b Snapshot) []CPUUse

PerCPU returns every CPU present in both snapshots, idlest first, ties by number so the choice is stable.

type Snapshot ¶

type Snapshot struct {
	All  Times
	CPUs map[int]Times
}

Snapshot is a whole /proc/stat: the aggregate "cpu" line and each "cpuN".

func Parse ¶

func Parse(data []byte) (Snapshot, error)

Parse reads the cpu lines of a /proc/stat. Fields a kernel does not print (an old one has no steal) are zero.

func ReadFile ¶

func ReadFile(path string) (Snapshot, error)

ReadFile parses the /proc/stat-shaped file at path.

type Times ¶

type Times struct {
	User, Nice, System, Idle, IOWait, IRQ, SoftIRQ, Steal uint64
}

Times is one line of /proc/stat in clock ticks: user, nice, system, idle, iowait, irq, softirq, steal (guest time is already inside user and nice, so it is not added again).

type Usage ¶

type Usage struct {
	Busy, User, Nice, System, IOWait, Steal float64
}

Usage is what happened between two snapshots of one line, as fractions of the elapsed ticks. Busy counts everything but idle and iowait: a CPU waiting on I/O is free to run a benchmark. Steal is reported apart because on a virtual machine it is time the host gave to someone else.

func Between ¶

func Between(a, b Times) Usage

Between is the usage from reading a to reading b.

Source Files ¶

View all Source files

procstat.go

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