wrong SWAP values in top's output

wrong SWAP values in top's output

[José Toneh]

Hello,

I'm running Debian Sarge's stock 2.6 kernel here:

$ uname -a
Linux localhost 2.6.8-2-k7 #1 Thu May 19 18:03:29 JST 2005 i686 GNU/Linux

$ vmstat -s | grep -1 'used swap'
       799992  total swap
       463680  used swap
       336312  free swap

$ top -bn1 | awk 'NR > 6 && NR < 20 { t += $4; print }
> END { print "Total SWAP for the first 12 processes: " t "m" }'
  PID %MEM  VIRT SWAP  RES CODE DATA  SHR nFLT nDRT S PR  NI %CPU COMMAND      
18551 14.1  345m 273m  71m 1712 343m 101m 1373    0 S 5 -10  4.0 XFree86      
25397 49.5  505m 255m 249m  164 505m  40m 3700    0 S 15   0  2.0 mozilla-bin  
24759  0.5  236m 234m 2416   16 236m  54m  138    0 S 17   0  0.0 java_vm      
 3107  4.6  113m  89m  23m  164 112m  34m 1462    0 S 15   0  0.0 mozilla-bin  
31064  1.5 65956  57m 7572  568  63m  19m  291    0 S 15   0  0.0 beep-media-  
27359  0.2 51756  49m 1224  124  50m 2424    0    0 S 25   0  0.0 pdnsd        
19098  3.0 45592  29m  15m  960  43m  15m  368    0 S 15   0  0.0 nicotine     
18653  1.9 37656  27m 9684  644  36m  19m  472    0 S 16   0  0.0 nautilus     
16887  1.6 27544  18m 8416  428  26m  14m  146    0 S 15   0  0.0 xchat        
12479  3.1 33560  16m  15m  428  32m  14m  147    0 S 15   0  0.0 xchat        
18615  0.4 17832  15m 1932   52  17m 3572  320    0 S 16   0  0.0 gconfd-2     
18628  0.8 18896  14m 4332  160  18m  17m    6    0 S 16   0  0.0 gnome-setti  
Total SWAP for the first 12 processes: 1076m

Seems like a bug to me.

Regards,

José Toneh




	



	
		
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Re: wrong SWAP values in top's output

[Jan Knutar]

On Friday 16 December 2005 11:08, you wrote:

>        463680  used swap

>   PID %MEM  VIRT SWAP  RES CODE DATA  SHR nFLT nDRT S PR  NI %CPU COMMAND      
> 18551 14.1  345m 273m  71m 1712 343m 101m 1373    0 S 5 -10  4.0 XFree86      
> 25397 49.5  505m 255m 249m  164 505m  40m 3700    0 S 15   0  2.0 mozilla-bin  
> 24759  0.5  236m 234m 2416   16 236m  54m  138    0 S 17   0  0.0 java_vm   

Shared pages and similar?

Seens like top's "SWAP" column is simply VIRT-RES.

Let's not also forget that read-only executable code just gets discarded
from memory, and not pushed to swap. If needed again, it gets read back
in from the file.

Oh, it's supposedly also bad to renice X to -10 with recent kernels ;-)