[stunnel-users] Dynamic hosts

Ludolf Holzheid lholzheid at bihl-wiedemann.de
Wed Jun 24 14:37:13 CEST 2009

On Wed, 2009-06-24 07:57:30 -0400, Terry Riegel wrote:
> >However, on modern operating systems, fork()ing is not as expensive as
> >it looks like. In most cases, the text segment is shared between the
> >two processes and the pages on data/BSS segments are not copied until
> >changed ('copy-on-write'). I don't know if the usage of OS resources
> >is larger for the multi-threaded or the multi-tasked approach.
> Perhaps I am confused, but are you saying that when firing up stunnel  
> twice with two separate configuration files they are sharing resources?

If you are starting several instances of stunnel, I don't expect them
to share resources (other than the text segments of the shared

If, in contrast, a running stunnel process fork()s into two (or, as in
your case, 6 processes), these new processes will share resources.

What I wanted to say is, you can't add the resource usage of the
single processes in a process tree to get the overall resource usage.
A daemon fork()ing into two or more single processes seems much more
expensive (w.r.t. resource usage) than it looks like.



Ludolf Holzheid             Tel:    +49 621 339960
Bihl+Wiedemann GmbH         Fax:    +49 621 3392239
Floßwörthstraße 41          e-mail: lholzheid at bihl-wiedemann.de
D-68199 Mannheim, Germany

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