In article <19990330155553.A18376@rtsnet.ru> you wrote:
> Правильно ли я понимаю, что загруженные at runtime
> DSO модули не шарятся (от share) между копиями httpd
> даже в том случае если httpd имеют один конфиг?
Вот что мне ответили в comp.infosystems.www.servers.unix
---
From: "Ralf S. Engelschall" <rse@engelschall.com>
Newsgroups: comp.infosystems.www.servers.unix
Subject: Re: DSO
Date: 1 Apr 1999 08:35:59 GMT
Message-ID: <7dvb5f$12r2$1@en1.engelschall.com>
Igor Vinokurov <igor@rtsnet.ru> wrote:
> Question about DSO modules - can its code be shared between
> parent/child processes on systems with support dlopen/dlsym?
> Especially FreeBSD/Linux?
I do not exactly understand your question, but three points (I assume you're
talking about DSO modules of Apache):
1. The DSO support in Apache is always dlopen/dlsym-based, except for some
brain-dead platforms where an emulation library is used (e.g. on AIX).
2. The code is usually always shared between the parent and forked
child-processes, independent whether you use DSOs or not. Because Apache
only loads DSOs into the parent and on modern Unix platforms like
FreeBSD/Linux copy-on-write is used. So, the code segments are shared for
DSO and non-DSO situation.
3. DSO modules are not there to safe memory (they don't).
Their intent is to provide flexibility, i.e. you can run different Apache
instances out of a single installation. For instance one with SSL, one
without SSL. One with SSL+Perl, one with only Perl, etc. In short: You
don't have to choose the modules under build/installation time. Instead you
can assemble your httpd processes under run-time. But that
hasn't anything to do with memory savings, of course.
Ralf S. Engelschall
rse@engelschall.com
www.engelschall.com
---
Я думаю, что Ralf S. Engelschall тут знают :)
--
Игорь Винокуров
Российская Торговая Система
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