clemensF wrote:
>
> > David Dyer-Bennet:
>
> > > identical program invocations get to run their own copy of the program
> > > text.
> >
> > I don't believe this last bit is the case. It's clearly not the case
> > on Linux, anyway, as displayed by the various size numbers in 'top'.
>
> but linux processes don't share one copy of, say, top, when it is called
> twice by different users, do they?
I'm pretty sure they do. Since programs can't modify their own
code space on a Linux system, there's really no reason to have
multiple images of any given program code in memory. Multiple
stacks, heaps, and sets of file descriptors, etc, but not program
code.
Your system is probably just thrashing with higher concurrencies
because it's swapping out chunks of the dynamic data of all those
processes...
Eric
