Just in case that there's someone as clueless as i was... "top" command lies about your memory usage with "new" kernels (2.6.x series) .Let me explain how this game works.
jupiter:/disponible/cargaMasivaDesa # top Tasks: 108 total, 1 running, 105 sleeping, 2 stopped, 0 zombie Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.0%us, 1.0%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 6127780k total, 6072248k used, 55532k free, 297820k buffers Swap: 2096472k total, 3320k used, 2093152k free, 3969068k cached
After a reboot everything seems in place, I mean you can "top" and watch your memory report correctly but after some hours (in my case more or less a day) you'll see that almost your memory is gone. But if you calm your nerves you'll see that counting process and the memory used by them will report that your memory is okey... So???
It seems that the important info is not on free/used fields reported by this tool. The stuff that really matters is in /proc/meminfo.
jupiter:/disponible/cargaMasivaDesa # cat /proc/meminfo
MemTotal: 6127780 kB
MemFree: 56568 kB
Buffers: 297864 kB
Cached: 3865668 kB
SwapCached: 1268 kB
Active: 2135488 kB
Inactive: 3655580 kB
Active: means memory in used
Inactive: means memory free but not available
Now i can sleep better!! . For more information you can have a look to the following articles:
http://www.netadmintools.com/art416.html
http://www.tldp.org/LDP/tlk/mm/memory.html
Cheers
P.S: memory reporting command by process
ps -eo pmem,pcpu,rss,vsize,args | sort -k 1 -r | head -10
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