From 1c9ce5581285b1e10c23a04acbe0056761245599 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adri=C3=A1n=20L=C3=B3pez?= <adrianlzt@gmail.com>
Date: Wed, 7 Aug 2019 00:55:06 +0200
Subject: [PATCH] Update the number of logical CPUs dynamically in system
 plugin (#6214)

---
 plugins/inputs/system/README.md | 2 ++
 plugins/inputs/system/system.go | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/plugins/inputs/system/README.md b/plugins/inputs/system/README.md
index d5bcd7b03a951..8b16c1de08d25 100644
--- a/plugins/inputs/system/README.md
+++ b/plugins/inputs/system/README.md
@@ -3,6 +3,8 @@
 The system plugin gathers general stats on system load, uptime,
 and number of users logged in. It is similar to the unix `uptime` command.
 
+Number of CPUs is obtained from the /proc/cpuinfo file.
+
 ### Configuration:
 
 ```toml
diff --git a/plugins/inputs/system/system.go b/plugins/inputs/system/system.go
index faf44f03e4e13..82e6b6db074d7 100644
--- a/plugins/inputs/system/system.go
+++ b/plugins/inputs/system/system.go
@@ -6,12 +6,12 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"runtime"
 	"strings"
 	"time"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/shirou/gopsutil/cpu"
 	"github.com/shirou/gopsutil/host"
 	"github.com/shirou/gopsutil/load"
 )
@@ -35,11 +35,16 @@ func (_ *SystemStats) Gather(acc telegraf.Accumulator) error {
 		return err
 	}
 
+	numCPUs, err := cpu.Counts(true)
+	if err != nil {
+		return err
+	}
+
 	fields := map[string]interface{}{
 		"load1":  loadavg.Load1,
 		"load5":  loadavg.Load5,
 		"load15": loadavg.Load15,
-		"n_cpus": runtime.NumCPU(),
+		"n_cpus": numCPUs,
 	}
 
 	users, err := host.Users()