Bug 39857 - top shows unrealistics idle values with multithreaded programs
top shows unrealistics idle values with multithreaded programs
Status: CLOSED DUPLICATE of bug 71237
Product: Red Hat Linux
Classification: Retired
Component: procps (Show other bugs)
7.1
i386 Linux
medium Severity low
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Assigned To: Alexander Larsson
Aaron Brown
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2001-05-09 09:07 EDT by Teemu Ikonen
Modified: 2007-04-18 12:33 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2002-07-01 09:25:21 EDT
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Description Teemu Ikonen 2001-05-09 09:07:17 EDT
Description of Problem:



When running multiple Java VM's with native threads, the top command shows incorrect idle time under high load. The idle values can be as high as 80000%.



How Reproducible:



In my system, always



Steps to Reproduce:

1. Run stressfull Java programs (for example with SUN's JDK 1.3.1)

2. Start top

3. Top will evantually show incorrect idle time



Actual Results:





Expected Results:





Additional Information:

	

Kernel:

Linux cs136237.pp.htv.fi 2.4.2-2 #6 SMP Mon May 7 13:10:59 EEST 2001 i686 unknown



Machine:

1 X 450 Mhz Pentium III (Single processor system) 256MB main memory



Piece of top:

116 processes: 114 sleeping, 2 running, 0 zombie, 0 stopped

CPU states: 180.5% user,  7.1% system,  0.0% nice, 835509.0% idle

Mem:   255392K av,  253180K used,    2212K free,       0K shrd,    7008K buff

Swap:  525152K av,   11656K used,  513496K free                  124852K cached



  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND

 8191 tikonen   19   0 18612  18M  8016 R    99.9  7.2   0:06 java

 8223 tikonen    9   0 18616  18M  8016 S    70.6  7.2   0:03 java

 8216 tikonen   10   0 18612  18M  8016 S     3.5  7.2   0:00 java

 7469 tikonen   16   0  1036 1036   768 R     2.1  0.4   3:54 top

 8222 tikonen    9   0 18616  18M  8016 S     0.9  7.2   0:00 java

 8215 tikonen   19   0 18612  18M  8016 S     0.3  7.2   0:00 java

 8218 tikonen    9   0 18612  18M  8016 S     0.3  7.2   0:00 java

 8230 tikonen    9   0 18628  18M  8016 S     0.1  7.2   0:00 java

 8232 tikonen    9   0 18628  18M  8016 S     0.1  7.2   0:00 java

 8236 tikonen   14   0 18632  18M  8016 S     0.1  7.2   0:00 java

    1 root       8   0   124   72    52 S     0.0  0.0   0:09 init

    2 root       8   0     0    0     0 SW    0.0  0.0   0:00 keventd

    3 root       9   0     0    0     0 SW    0.0  0.0   0:09 kswapd

    4 root       9   0     0    0     0 SW    0.0  0.0   0:00 kreclaimd
Comment 1 Alexander Larsson 2002-08-12 05:37:03 EDT

*** This bug has been marked as a duplicate of 71237 ***

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