How to Determine CPU Usage in Go?

Determining CPU Usage in Go

In this question, we aim to provide a solution for obtaining the current CPU usage percentage of both system and user processes in a Go program.

To achieve this, we recommend utilizing the goprocinfo package (https://github.com/c9s/goprocinfo). This package simplifies the process of parsing system metrics, including CPU statistics.

Implementation:

To retrieve CPU usage data, follow these steps:

1. Import the linuxproc package:

   import "github.com/c9s/goprocinfo/linuxproc"

2. Read the system statistics from /proc/stat:

   stat, err := linuxproc.ReadStat("/proc/stat")
   if err != nil {
    // Handle error
   }

3. Iterate over the stat.CPUStats slice:

   for _, s := range stat.CPUStats {
    // s.User: CPU time spent in user space (in nanoseconds)
    // s.Nice: CPU time spent in user space with low priority (in nanoseconds)
    // s.System: CPU time spent in kernel space (in nanoseconds)
    // s.Idle: CPU time spent in idle state (in nanoseconds)
    // s.IOWait: CPU time spent waiting for I/O completion (in nanoseconds)
   }

By accessing these values, you can calculate the CPU usage percentage for both user and system processes.

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