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SubjectRe: How do you accurately determine a process' RAM usage?
P@draigBrady.com wrote:
>
> I wrote a tool to report how much RAM a
> particular program (apache for e.g.) was using:
> http://www.pixelbeat.org/scripts/ps_mem.py
>
> I was then pointed at the following:
> http://wiki.apache.org/spamassassin/TopSharedMemoryBug
> which describes how copy-on-write pages are
> not counted as shared since 2.6.
>
> So how can one determine how much RAM a process is using?
> Seems like a fundamental requirement to me.
> Could we add a "SharedTotal" column to /proc/$$/statm for e.g. ?

Calculating this stuff accurately is very expensive. You'll get a better
answer using proc-pid-smaps.patch from -mm, but even that won't tell you
things about sharing levels of the pages.

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