Threaded 6.4 code compiled under 9.0 uses a lot more memory?..

[Dan Nelson]

In the last episode (Oct 31), Karl Pielorz said:
> --On 31 October 2012 16:06 +0200 Konstantin Belousov <kostikbel at gmail.com> wrote:
> > Since you neglected to provide the verbatim output of procstat, nothing
> > conclusive can be said.  Obviously, you can make an investigation on
> > your own.
> 
> Sorry - when I ran it this morning the output was several hundred lines -
> I didn't want to post all of that to the list 99% of the lines are very
> similar.  I can email it you off-list if having the whole lot will help?
> 
> >> Then there's a bunch of 'large' blocks e.g..
> >>
> >>  PID              START                END PRT  RES PRES REF SHD  FL TP
> >>  PATH 2010        0x801c00000        0x802800000 rw- 2869    0   4   0
> >> ---- df 2010        0x802800000        0x803400000 rw- 1880    0   1   0
> >
> > Most likely, these are malloc arenas.
> 
> Ok, that's the heaviest usage.
> 
> >> Then lots of 'little' blocks,
> >>
> >> 2010     0x7ffff0161000     0x7ffff0181000 rw-   16    0   1   0 ---D df
> >
> > And those are thread stacks.
> 
> Ok, lots of those (lots of threads going on) - but they're all pretty
> small.
> 
> My code only has a single call to malloc, which allocates around 20k per
> thread.
> 
> Obviously there's other libraries and stuff running with the code - so
> would I be correct in guessing that they are more than likely for most of
> these large blocks?

Note that libmilter may do a lot of mallocs on its own, especially if you
are examining the message body.  There are also jemalloc tuning options that
may lower total meory usage if you are using a lot of threads.  I'd take
a look at the G and R flags first.

-- 
	Dan Nelson
	dnelson at allantgroup.com