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CPUStat

As explained in Build and Orchestrator in Go (From Scratch)

CPUStat is a goprocinfo type representing the time a CPU spends in different execution states.

CPUStat is a goprocinfo structure that exposes cumulative CPU time across execution states, including user, system, idle, I/O wait, interrupts, steal, and guest time. section 6.3

Calculating CPU usage

Read /proc/stat through goprocinfo, obtain CPUStatAll, combine Idle and IOWait as idle time, combine the remaining states as non-idle time, and return non-idle time divided by total time. A zero total returns 0.00.

How Build and Orchestrator in Go (From Scratch) covers it

How deep it goes
Defines the state fields and demonstrates utilization calculation, but defers broader metric collection details.
Examples
Uses CPUStatAll and a CpuUsage method to derive a percentage from CPU state counters.
What it assumes
Assumes basic Go structures and pointers while exposing /proc/stat access through a library.
What you can do after
Apply it via goprocinfo to read CPU counters and calculate utilization.
How it connects
Connects goprocinfo, /proc/stat, Stats, and CPU usage.
Cover of Build and Orchestrator in Go (From Scratch)
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Build and Orchestrator in Go (From Scratch). The section links point to the parts of the book it draws on.