Becuase DSO's are shared libs. Here is an excerpt about shared libs:
The shared library code is not present in the executable image on disk. Shared code is
loaded into memory once in the shared library segment and shared by all
processes that reference it. The advantages of shared libraries are:
Less disk space is used because the shared library code is not included in the
executable programs.
Less memory is used because the shared library code is only loaded once.
Load time may be reduced because the shared library code may already be in
memory.
Performance may be improved because fewer page faults will be generated when the
shared library code is already in memory.
However, there is a
performance cost in calls to shared library routines of one to eight
instructions.
Jason
Zeev Suraski wrote:
>
> Why would using DSO reduce memory consumption?
> Using DSO makes things easier to administer and maintain, but it doesn't
> save any memory and it does pose a slight performance decrease...
>
> Zeev
>
> At 02:20 30/1/2001, Jason Greene wrote:
> >MaxRequestsPerChild is perfectly safe, and I always believe in setting it.
> >Keep in mind that if you compile all modules into apache statically, it takes
> >up far more base mem per process. If you use all DSO's, you can
> >significantly reduce memory usage. To find out what's in use on RH7
> >cat /proc/<pid>/maps of an apache child.
> >You can also reduce the KeepAlive timeout value to help-out.
> >
> >Jason
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Rasmus Lerdorf" <[EMAIL PROTECTED]>
> > > To: "Filip Sielimowicz" <[EMAIL PROTECTED]>
> > > Cc: <[EMAIL PROTECTED]>
> > > Sent: Monday, January 29, 2001 7:51 AM
> > > Subject: Re: [PHP-DEV] PHP 4.0 Bug #8889: Memory is not being freed.
> > >
> > >
> > > > On Mon, 29 Jan 2001, Filip Sielimowicz wrote:
> > > >
> > > > > > A quick fix would be to set your MaxRequestsPerChild to a lower
> > value.
> > > > >
> > > > > Have you ever tried to measure the time of killing and
> > > > > starting httpd process ? You can see that with a bare human eye.
> > > >
> > > > Sure. But that isn't something that happens on an actual request, so an
> > > > end user isn't going to see that.
> > > >
> > > > -Rasmus
> > > >
> > > >
> > > > --
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> > > >
> > >
> >
> >
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> --
> Zeev Suraski <[EMAIL PROTECTED]>
> CTO & co-founder, Zend Technologies Ltd. http://www.zend.com/
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