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Re: "ps -o %mem" and free memory in Linux

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Tixy wrote:
> > 
> > Could you please clarify for me how the following is possible. `ps` shows
> > that the php-fpm workers have occupied 62% of physical memory, while
> > `free` shows that only 1.3Gi (which is 17% of total RAM) is used:
> > 
> > $ ps axww -o cmd,%mem |awk '/php-fpm/{sum+=$NF}END{print sum}'
> > 62.1
> > $ free -h
> >               total        used        free      shared  buff/cache available
> > Mem:          7.5Gi       1.3Gi       4.4Gi       113Mi       1.8Gi
> > 5.8Gi
> > Swap:            0B          0B          0B
> > $ 
> 
> Perhaps because the php-fpm workers were forked from the same parent
> and so a lot of theie 'physical' RAM is actually the same RAM as each
> other, because it's not been modified?

I see your point, but ps(1) talks about real physical RAM:

%mem        %MEM      ratio of the process's resident set size  to the physical memory on the machine, expressed as a percentage.  (alias pmem).

If those php-fpm workers share a lot of virtual (?) memory between one
another, shouldn't `ps` show it as such?

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/

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"ps -o %mem" and free memory in Linux Victor Sudakov <vas@sibptus.ru> - 2020-09-29 05:30 +0200
  Re: "ps -o %mem" and free memory in Linux Tixy <tixy@yxit.co.uk> - 2020-09-29 09:20 +0200
    Re: "ps -o %mem" and free memory in Linux Victor Sudakov <vas@sibptus.ru> - 2020-09-29 17:20 +0200
      Re: "ps -o %mem" and free memory in Linux Klaus Singvogel <deb-user-ml@singvogel.net> - 2020-09-29 17:40 +0200
        Re: "ps -o %mem" and free memory in Linux Victor Sudakov <vas@sibptus.ru> - 2020-09-29 18:00 +0200
          Re: "ps -o %mem" and free memory in Linux Fabrice BAUZAC-STEHLY <noon@mykolab.com> - 2020-10-02 21:50 +0200
  Re: "ps -o %mem" and free memory in Linux <tomas@tuxteam.de> - 2020-09-29 11:20 +0200
    Re: "ps -o %mem" and free memory in Linux Victor Sudakov <vas@sibptus.ru> - 2020-09-29 17:20 +0200
      Re: "ps -o %mem" and free memory in Linux <tomas@tuxteam.de> - 2020-09-29 17:30 +0200
        Re: "ps -o %mem" and free memory in Linux Victor Sudakov <vas@sibptus.ru> - 2020-09-29 18:00 +0200

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