Bug 3670 - Jobs on a Dual processor machine only use 50% of 1 CPU!!
Jobs on a Dual processor machine only use 50% of 1 CPU!!
Product: Red Hat Linux
Classification: Retired
Component: glibc (Show other bugs)
i386 Linux
high Severity high
: ---
: ---
Assigned To: Cristian Gafton
Depends On:
  Show dependency treegraph
Reported: 1999-06-23 10:18 EDT by feldman
Modified: 2008-05-01 11:37 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 1999-07-08 21:11:34 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

  None (edit)
Description feldman 1999-06-23 10:18:00 EDT
We are using an Asus P2B-D motherboard with two Pentium II
processors installed on it, and have installed RedHat 6.0
The SMP kernel is loaded by default and the two processors
seem to be detected.

However, when running a job, "top" reports only 50% CPU
usage and takes twice as long as it did beforehand.
If 2 jobs are run simultaneously, both take 50% and if 3 or
more are run, they begin to slow down each other further, so
it looks like only 1 processor is beign used, and a maximum
of 50% being allocated to any one task.

The majority of all kernel and motherboard settings are at
defaults except for simple things like drive settings and so
Comment 1 Jay Turner 1999-06-23 11:16:59 EDT
This issue has been forwarded to a developer for further review.
Comment 2 feldman 1999-06-25 09:46:59 EDT
It appears this is not actually a bug but a "feature".  The 50% seems
to imply 50% of both CPUS and the CPU time acts as if both CPUs were
just 1 cpu, so a job that takes 1 processor 2 minutes of real time
takes 1 minute of "CPU" time at 50%.  So I guess this is not a bug.
Comment 3 Cristian Gafton 1999-07-08 21:11:59 EDT
Normal operation.

Note You need to log in before you can comment on or make changes to this bug.