how we can reach at RAM size by summing up the memory occupied by processes and free memory in linux? -

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this question has answer here:

i want know how calculate total ram, how can reach @ ram size summing output of "cat proc/meminfo" command

memtotal = memfree+?...........

any 1 can

you need tool takes shared memory account this.

for example, smem:

# smem -t   pid user     command                         swap      uss      pss      rss ... 10593 root     /usr/lib/chromium-browser/c        0    22868    26439    49364  11500 root     /usr/lib/chromium-browser/c        0    22612    26486    49732  10474 browser  /usr/lib/chromium-browser/c        0    39232    43806    61560   7777 user     /usr/lib/thunderbird/thunde        0    89652    91118   102756  -------------------------------------------------------------------------------   118 4                                       40364   594228   653873  1153092

pss interesting column here because takes shared memory account (adding rss result in shared mem segments being counted multiple times numbers won't add up).

so userland processes take 654mb total here.

# smem -tw area                           used      cache   noncache  firmware/hardware                 0          0          0  kernel image                      0          0          0  kernel dynamic memory        345784     297092      48692  userspace memory             654056     181076     472980  free memory                   15828      15828          0  ----------------------------------------------------------                             1015668     493996     521672

346mb used kernel , there's 16mb free.
overall half of memory used cache (494mb).

so 1gb ram total = 654mb userland processes, broken above + 346mb kernel mem + 16mb free
(give or take few mb)


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