Possible working method to get actual process size on Linux

[Stefan Reich]

So ZGC maps the heap 3 times, not 4?

I realize this is not a good assumption to rely on, but I still like to
know...

On Thu, 3 Oct 2019 at 15:06, Per Liden <per.liden at oracle.com> wrote:

>
> On 10/3/19 2:52 PM, Stefan Reich wrote:
> > Breakdown of the process's pages by RSS:
> >
> > Address range 000000xxxxxxxxxx: 1 MB
> > Address range 000004xxxxxxxxxx: 2461 MB
> > Address range 000008xxxxxxxxxx: 2476 MB
> > Address range 000010xxxxxxxxxx: 2662 MB
> > Address range 00007cxxxxxxxxxx: 648 MB
> >
> > This is really getting confusing...
>
> You have three Java heap mappings (~2.5G) + non-Java heap stuff (648M),
> which gives you ~3.1G, which is similar to what ps_mem reports.
>
> /Per
>
> >
> > On Thu, 3 Oct 2019 at 14:47, Stefan Reich
> > <stefan.reich.maker.of.eye at googlemail.com
> > <mailto:stefan.reich.maker.of.eye at googlemail.com>> wrote:
> >
> >     The situation is still confusing. My process has:
> >
> >     Runtime.totalMemory() = 2.7 GB
> >     Runtime.usedMemory() =~ 1 GB
> >
> >     ps_mem.py says:
> >
> >     root at smartbot:~/bin# ps_mem.py -p 4837
> >       Private  +   Shared  =  RAM used Program
> >
> >     745.5 MiB +   2.4 GiB =   3.1 GiB java
> >     ---------------------------------
> >                                3.1 GiB
> >
> >     Is the heap counted as shared memory here? The shared memory value
> >     seems way too large.
> >
> >     My own tool reports < 1 GB as RSS which seems way too low...
> >
> >
> >     On Thu, 3 Oct 2019 at 14:32, Per Liden <per.liden at oracle.com
> >     <mailto:per.liden at oracle.com>> wrote:
> >
> >
> >         On 10/3/19 2:23 PM, Stefan Reich wrote:
> >          > Hi Per!
> >          >
> >          > Yes, I saw, sorry for not responding the other time.
> >          >
> >          > This problem is, /proc/*/smaps_rollup doesn't exist on one of
> my
> >          > machines (the one with the oldest kernel). On the newer
> >         machines, yeah,
> >          > it may be an option to use PSS from smaps_rollup.
> >          >
> >          > Not sure if there are any tools which would help here.
> >
> >         I know some of them (e.g. ps_mem.py), works on older kernels that
> >         doesn't have /proc/<pid>/smaps_rollup.
> >
> >         cheers,
> >         Per
> >
> >          >
> >          > Greetings,
> >          > Stefan
> >          >
> >          > On Thu, 3 Oct 2019 at 14:16, Per Liden <per.liden at oracle.com
> >         <mailto:per.liden at oracle.com>
> >          > <mailto:per.liden at oracle.com <mailto:per.liden at oracle.com>>>
> >         wrote:
> >          >
> >          >
> >          >     Did you see my reply to your previous question on this
> >         topic? Tools to
> >          >     extract this data (PSS) exist. Are they not doing what
> >         you want?
> >          >
> >          >     cheers,
> >          >     Per
> >          >
> >          >
> >          >
> >          > --
> >          > Stefan Reich
> >          > BotCompany.de // Java-based operating systems
> >
> >
> >
> >     --
> >     Stefan Reich
> >     BotCompany.de // Java-based operating systems
> >
> >
> >
> > --
> > Stefan Reich
> > BotCompany.de // Java-based operating systems
>


-- 
Stefan Reich
BotCompany.de // Java-based operating systems