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7.4

help determining actual memory used by an app

Asked by dtkerns in Computer Memory (RAM), Linux Programming, Kernel And Operating System Specific Programming

Tags: vmsize, actual, linux, means, memory

What does the VmSize column from a ps command really mean?

running on a linux 2.6.8.1 kernel on MIPS

 a ps shows my app has 3 threads:
  PID  PRI  Uid     VmSize Stat Command
  163    0 root        764 S < app
  185    0 root        764 S < app
  186    0 root        764 S < app

/proc/meminfo reports
MemTotal:        28644 kB
MemFree:           508 kB

then I "activate" my app (make it do it's steady state work)
and a ps shows:
  163    0 root       2836 S < app
  185    0 root       2836 S < app
  186    0 root       2836 S < app
17439    0 root       2836 S < app
17440    0 root       2836 S < app
17445    0 root       2836 S < app
17446    0 root       2836 S < app
17447    0 root       2836 S < app
17448    0 root       2836 S < app
17451    0 root       2836 S < app
17452    0 root       2836 S < app

MemTotal:        28644 kB
MemFree:           180 kB

so my app spawned 8 additional threads (each with VmSize growing 2099 "units") while freemem only dropped by 328k.

[+][-]05/11/07 01:13 PM, ID: 19075119Accepted Solution

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About this solution

Zones: Computer Memory (RAM), Linux Programming, Kernel And Operating System Specific Programming
Tags: vmsize, actual, linux, means, memory
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Solution Provided By: dpk_wal
Participating Experts: 1
Solution Grade: B
 
[+][-]05/14/07 12:20 PM, ID: 19087692Author Comment

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[+][-]05/14/07 07:43 PM, ID: 19090083Expert Comment

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