I have the same bug reproduced on my machine. details below.
among top, htop and system monitor, the results shown by system monitor
seems to be the correct in my case
Distributor ID: Ubuntu
Description:Ubuntu 13.10
Release:13.10
Codename: saucy
** Attachment added: "top, hto
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: procps (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/997121
Title:
top
** Package changed: ubuntu => procps (Ubuntu)
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Title:
top command shows incorrect memory usage
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** Attachment added: "Memory_usage.png"
https://bugs.launchpad.net/bugs/997121/+attachment/3138486/+files/Memory_usage.png
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Title:
top command
