Sysadmin Netflix Brendan Gregg says %CPU Utilisation Is Wrong

eva2000 · 2018-05-29

Brendan Gregg at Netflix Lightning talk at 16th annual Southern California Linux Expo (SCALE) is interesting - CPU utilization is wrong CPU utilization is the metric everyone uses to measure a processor's performance. But %CPU is a misleading measure...

Discussion in 'System Administration' started by eva2000, May 29, 2018.

Tags:

Previous Thread Next Thread

May 29, 2018 #1
eva2000 Administrator Staff Member

58,893

12,490

113

May 24, 2014

Brisbane, Australia

Ratings:

+19,122

Local Time:

2:00 PM

Nginx 1.31.x

MariaDB 10.x/11.4+/12.3+
Brendan Gregg at Netflix Lightning talk at 16th annual Southern California Linux Expo (SCALE) is interesting - CPU utilization is wrong

CPU utilization is the metric everyone uses to measure a processor's performance. But %CPU is a misleading measure of how busy your processor really is, says Brendan Gregg, senior performance architect at Netflix, in what he calls a "five-minute public service announcement,"

In his Lightning Talk, "CPU Utilization is Wrong," Brendan explains what CPU utilization means—and doesn't mean—about performance and shares the open source tools he uses to identify reasons for bottlenecks and tune Netflix's systems. He also includes a mysterious case study that's relevant to everyone in 2018.
Click to expand...

And a bit of a spoiler as to why %CPU is wrong now

http://www.brendangregg.com/blog/2017-05-09/cpu-utilization-is-wrong.html

KPTI/KAISER Meltdown Initial Performance Regressions