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Strange memory consumption



Hi,

I'm experiencing a very strange phenomenon on a RH4.1 system.
No heavy processes are running, yet memory consumption is soaring, and the
load is above 6. 
In the process table, there's no process consuming a lot of memory, and
the sum of memory chunks used by processes is tiny compared to the total
memory use reported. Here's what 'top' output looks like (sorted by mem
usage):

------------------------------------------------------------------------
 11:54am up 4 days, 15:32, 6 users, load average: 8.19, 7.76, 6.88 
62 processes: 58 sleeping, 1 running, 0 zombie, 3 stopped 
CPU states: 1.1% user, 1.1% system, 2.1% nice, 97.9% idle 
Mem:  257160K av, 213624K used, 43536K free, 41032K shrd, 76224K buff
Swap: 782224K av, 0K used, 782224K free 98096K cached

  PID USER PRI NI SIZE  RSS SHARE STAT LIB %CPU  %MEM TIME COMMAND 
26992 ranit  0 0 10084 9.8M 4168  S 	0   0.0   3.9 0:45 matlab 
27567 ranit 10 0  6644 6644 3132  S 	0   0.7   2.5 0:18 xemacs
 3529 root   0 0  2124 2124 1336  S 	0   0.0   0.8 0:14 xterm 
26938 ranit  0 0  1940 1940  828  S 	0   0.0   0.7 0:03 rxvt 
26905 root   0 0  1788 1788 1444  S 	0   0.0   0.6 0:00 xdm 
27107 ranit  0 0  1700 1700  828  S 	0   0.0   0.6 0:09 rxvt 
27923 ranit  0 0  1700 1700  828  S 	0   0.0   0.6 0:00 rxvt 
26922 ranit  0 0  1644 1644 1312  S 	0   0.0   0.6 0:00 xmailbox 
26919 ranit  6 6  1584 1584 1252  S N   0   0.0   0.6 0:00 xload 
26921 ranit  0 0  1568 1568 1256  S 	0   0.0   0.6 0:00 xclock 
26908 ranit  0 0  1308 1308  956  S 	0   0.0   0.5 0:03 fvwm95-2
  327 root   0 0  1164 1164 1028  S 	0   0.0   0.4 0:00 xdm
 3538 oran   0 0  1064 1064  624  S 	0   0.0   0.4 0:01 tcsh 
27108 ranit  0 0  1044 1044  628  S 	0   0.0   0.4 0:00 tcsh 
26914 ranit  0 0  1000 1000  800  S 	0   0.0   0.3 0:00 FvwmTaskBar 
26913 ranit  0 0   992  992  816  S 	0   0.0   0.3 0:00 FvwmButtons
27924 ranit  1 0   972  972  628  S 	0   0.0   0.3 0:00 tcsh

----------------------------------------------------------------------

Any idea regarding what's going on here will be appreciated.


Thanks,
Tuvik