WG: preparing perl-interpreters

> -----Ursprüngliche Nachricht-----
> Von: Michael Ganz [mailto:[email protected]]
> Gesendet: Dienstag, 7. September 2010 18:45
> An: 'Rob Janes'
> Betreff: AW: preparing perl-interpreters
> 
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Rob Janes [mailto:[email protected]]
> > Gesendet: Dienstag, 7. September 2010 17:16
> > An: [email protected]
> > 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 <[email protected]>
> > 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      |   --
> > > --    -|___|---------------------------------------    --
> > >