Memory Utilization on Linux

[Nilesh]

Hello,
 
I would like to know how much physical memory
consumned by each runing applications on Linux
The ps and top are showing different outputs, I could
not find it out , what ammount of actual memory
consumed by each runing process on my system
 
The scenario is : 
 
The physcial memory installed on Linux system is
1024MB 
 
Top command output :
 
top - 02:11:57 up 18:48,  2 users,  load average:
0.00, 0.00, 0.00
Tasks: 126 total,   1 running, 125 sleeping,   0
stopped,   0 zombie
Cpu(s):  0.0% us,  0.2% sy,  0.0% ni, 99.8% id,  0.0%
wa,  0.0% hi,  0.0% si
Mem:   1026328k total,   810848k used,   215480k free,
   47032k buffers
Swap:  2040244k total,        0k used,  2040244k free,
  316708k cached
 
Free command output :
 
Free -mt 
                        total       used       free   
 shared    buffers     cached
Mem:                1002        791        210        
 0         45        309
-/+ buffers/cache:              436        565
Swap:               1992          0         1992
Total:                 2994        791       2203
 
The free command is showing 436MB used and 565MB is
free but the Top command is showing 810MB is used and
215MB is free 
why cached is showing 309MB is it swap memory If I
calculate it comes to 436+309+45=791 how cache is
distributed with each application 
is cache and VIRT is same 
 
could anyone tell me how do I find out exact physical
memory occupied by each applications.
 
If go with ps command, is RSS is write value or
Virtual Memory + RSS ( Resident set size) value 
 
#ps -eo rss,pcpu,comm,user,pid,time |sort -rnk1|head
-20
 
242896  0.1 java           501       5294 00:01:28
27628  0.0 spamd           root      3314 00:00:01
25380  0.0 spamd           root      3093 00:00:00
23624  0.0 spamd           root      3315 00:00:00
22656  0.0 mysqld          mysql     9573 00:00:00
22656  0.0 mysqld          mysql     5415 00:00:02
22656  0.0 mysqld          mysql     5340 00:00:00
22656  0.0 mysqld          mysql     5336 00:00:00
22656  0.0 mysqld          mysql     3322 00:00:00
22656  0.0 mysqld          mysql     3321 00:00:00
22656  0.0 mysqld          mysql     3320 00:00:00
22656  0.0 mysqld          mysql     3319 00:00:00
22656  0.0 mysqld          mysql     3311 00:00:00
22656  0.0 mysqld          mysql     3310 00:00:00
22656  0.0 mysqld          mysql     3309 00:00:00
22656  0.0 mysqld          mysql     3308 00:00:00
22656  0.0 mysqld          mysql     3307 00:00:00
22656  0.0 mysqld          mysql     3233 00:00:00
22656  0.0 mysqld          mysql    22854 00:00:00
22656  0.0 mysqld          mysql    22853 00:00:00

Thanks 
Nilesh 
 


 
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