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From: "Ralf Habacker" <Ralf DOT Habacker AT freenet DOT de>
To: <cygwin AT cygwin DOT com>
Subject: AW: cygwin vfork
Date: Tue, 13 Nov 2001 12:48:24 +0100
Message-ID: <000101c16c39$19f18980$651c440a@BRAMSCHE>
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>
> Seen on the XEmacs list:
>
>  > In general the cygwin build is slower, I think this is for 3 main
>  > reasons:
>  >
>  > 1) gcc optimization is not as good as MSVC
>  > 2) The cygwin portability layer adds a lot of overhead especially
>  > wrt file handling.
>  > 3) The cygwin implementation of fork-and-exec doesn't jive well with
>  > the VM size of xemacs. Supposedly a real vfork is in the works for
>  > cygwin but I can't attest to its functionality.
>
> Does #3 make any sense?  I thought we *had* a real vfork...perhaps it
> doesn't work well with large apps?
>
Can you explain this a little bit more ? I'm asking because in
http://sources.redhat.com/ml/cygwin-xfree/2001-q4/msg00276.html I have described
some problems with kde2 on cygwin relating performance and I'm very interested
in getting more informations how to fix these problems. In short, loading the
full kde2 desktop needs about 4 minutes and the reaction time for starting apps
are  > 1 minute. This seems to be unusable.
My assumption are that these problems depends on application loading (vfork is
used on every app), file and socket io.
A regular kde2 app uses about 20-40 dll's, so a faster vfork would decrease the
loading time. :-)

Regards
Ralf

> --Chuck
>
>
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