> -----Ursprüngliche Nachricht-----
> Von: Michael Ganz [mailto:michael_g...@t-online.de]
> Gesendet: Dienstag, 7. September 2010 18:45
> An: 'Rob Janes'
> Betreff: AW: preparing perl-interpreters
>
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: Rob Janes [mailto:janes....@gmail.com]
> > Gesendet: Dienstag, 7. September 2010 17:16
> > An: perl-xs@perl.org
> > Betreff: Re: preparing perl-interpreters
> >
> > it's possible perl is statically linked. ldd `type -p perl` will
> show
> > the libperl.so shared library if it's dynamically linked.
>
> It's linked shared, ldd shows an entry to libperl.so (Perl 5.12.1).
>
> >
> > valgrind will show actual memory usage.
>
> I have not yet valgrinded. OpenSuse 11.2 has an error here. But I try
> this on another box.
>
> >
> > pmap will show shared library segments. you can assume libperl.so
> > code segments are shared. i don't think the data segments are
> shared.
>
> pmap shows a lot of anon blocks with size of 2048K.
> 00002ad3ff039000 2048K 8K 4K 8K 0K rw-p [anon]
> 00002ad3ff239000 4K 0K 0K 0K 0K ---p
> [anon]00002ad404000000 131072K 130936K 11903K 130936K 0K rw-p
> [anon]
> ...
>
> And some really big ones:
>
> 00002ad410000000 655360K 654952K 59541K 654952K 0K rw-p [anon]
> 00002ad43c000000 168068K 167964K 15285K 167964K 0K rw-p [anon]
>
> >
> > ps is deceptive in that it does not report shared memory savings.
>
> I looked to the processes by top
> Now loading about 1000 perl-scripts and having 10 forked children of my
> perl-server.
> The Perl-Interpreter Instances are created in the perl-server
>
> top - 18:35:35 up 13 days, 6:17, 2 users, load average: 0.00, 0.00,
> 0.00
> Tasks: 227 total, 1 running, 226 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.2%us, 0.1%sy, 0.0%ni, 99.6%id, 0.1%wa, 0.0%hi, 0.0%si,
> 0.0%st
> Mem: 8184844k total, 6689408k used, 1495436k free, 554284k
> buffers
> Swap: 16779852k total, 0k used, 16779852k free, 3988704k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 18790 mganz 20 0 1459m 1.0g 16m S 0 12.8 0:10.70 perlServer
> 19292 mganz 20 0 1459m 1.0g 3744 S 0 12.7 0:00.13 perlServer
> 19295 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.10 perlServer
> 19298 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.10 perlServer
> 19301 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.10 perlServer
> 19304 mganz 20 0 1459m 1.0g 3272 S 0 12.7 0:00.15 perlServer
> 19307 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.13 perlServer
> 19310 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.08 perlServer
> 19313 mganz 20 0 1459m 1.0g 3264 S 0 12.7 0:00.18 perlServer
> 19316 mganz 20 0 1459m 1.0g 3272 S 0 12.7 0:00.10 perlServer
> 19319 mganz 20 0 1459m 1.0g 3272 S 0 12.7 0:00.12 perlServer
>
> >
> >
> http://www.linuxquestions.org/linux/articles/Technical/Understanding_me
> > mory_usage_on_Linux
> > http://stackoverflow.com/questions/131303/linux-how-to-measure-
> actual-
> > memory-usage-of-an-application-or-process
> >
> > -rob
> >
> > On Tue, Sep 7, 2010 at 10:51 AM, Alexandre Jousset <m...@gtmp.org>
> > wrote:
> > > Hi,
> > >
> > > Le 07/09/2010 15:59, Michael Ganz a écrit :
> > >>
> > >> I saw that every interpreter-instance will allocate about 1MB of
> RAM
> > >> (Linux).
> > >>
> > >> So dealing with about 250 scripts, this allocates about 250 MB of
> > RAM.
> > >
> > > I may be wrong but if I understand correctly, it's 250MB of
> > *virtual*
> > > memory. Not real. libperl.so is loaded once and shared between
> > multiple
> > > instances.
> > >
> > > My 2c,
> > > --
> > > -- \^/ --
> > > -- -/ O \--------------------------------------- --
> > > -- | |/ \| Alexandre (Midnite) Jousset | --
> > > -- -|___|--------------------------------------- --
> > >
