From 829f2fafbdcf538249414a07fcb2943b1c605f56 Mon Sep 17 00:00:00 2001
From: Cnpt <44840184+TheBestLL@users.noreply.github.com>
Date: Sat, 24 Aug 2024 20:46:32 +0800
Subject: [PATCH] Refactoring the algorithm for calculating CPU usage  (#1692)

refactor(process): Refactoring the algorithm for calculating CPU usage
---
 process/process.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/process/process.go b/process/process.go
index deba7c7b1..d73f1f972 100644
--- a/process/process.go
+++ b/process/process.go
@@ -325,7 +325,11 @@ func calculatePercent(t1, t2 *cpu.TimesStat, delta float64, numcpu int) float64
 	if delta == 0 {
 		return 0
 	}
-	delta_proc := t2.Total() - t1.Total()
+	// https://github.com/giampaolo/psutil/blob/c034e6692cf736b5e87d14418a8153bb03f6cf42/psutil/__init__.py#L1064
+	delta_proc := (t2.User - t1.User) + (t2.System - t1.System)
+	if delta_proc <= 0 {
+		return 0
+	}
 	overall_percent := ((delta_proc / delta) * 100) * float64(numcpu)
 	return overall_percent
 }