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testdriven / psi-probe

Advanced manager and monitor for Apache Tomcat, forked from Lambda Probe
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CPU usage shouldn't exceed 100% on a multi-core system #321

Open padcom opened 10 years ago

padcom commented 10 years ago

From andrew.m...@icasework.com on October 02, 2012 11:27:49

  1. Install probe on a system with multiple processors (there are 8 on the system that I see this issue on)
  2. View JVM CPU Usage % under load

I would expect to see a value < 100%

However I sometimes see values in the 125% - 150% range. Querying this on the Probe Google Discussion list, it was suggested to raise as an issue.

Probe version 2.3.1

Running on Linux i386 2.6.9-100.0.0.0.1.ELxenU (distro unknown)

JVM 1.5.09-b03

Original issue: http://code.google.com/p/psi-probe/issues/detail?id=321

padcom commented 10 years ago

From MALfunct...@gmail.com on October 02, 2012 07:28:09

Original group post here: https://groups.google.com/d/msg/psi-probe-discuss/rdzJaI7Jqac/CLY4q6Ud3psJ

Status: Accepted

padcom commented 10 years ago

From MALfunct...@gmail.com on November 30, 2012 15:10:35

I think I'll also expose the number of processors on the "OS information" page.

Status: Started
Owner: MALfunct...@gmail.com
Labels: -Milestone-TBD Milestone-2.4.0

padcom commented 10 years ago

From MALfunct...@gmail.com on November 30, 2012 15:40:26

Summary: CPU usage shouldn't exceed 100% on a multi-core system (was: Incorrect JVM CPU Usage % on multi-core system)

padcom commented 10 years ago

From MALfunct...@gmail.com on November 30, 2012 15:41:49

This issue was updated by revision r720 .

Dividing CPU usage time by the number of processors to account for the shared load.

padcom commented 10 years ago

From MALfunct...@gmail.com on November 30, 2012 15:44:33

Blocking: psi-probe:330

padcom commented 10 years ago

From MALfunct...@gmail.com on November 30, 2012 15:45:10

Filed issue 330 to represent displaying the number of processors.

Status: FixedInSource