Performance optimization in av::fixup - use buffered IO, not mapped file

Corinna Vinschen
Wed Dec 12 17:15:00 GMT 2012

On Dec 12 12:11, Christopher Faylor wrote:
> On Wed, Dec 12, 2012 at 12:06:08PM -0500, Ryan Johnson wrote:
> >It's painfully reproducible. It takes nearly two hours for a gcc 
> >bootstrap compiler to configure the various bits of the next stage. It's 
> >the same for emacs unexec (as OP reported).
> I'd like to see a small controlled test case which demonstrates the
> problem.  If the claims here are all true then it should be very easy to
> demonstrate without resorting to bootstrapping the compiler.
> And, given my comment about setup.exe, I suspect that this isn't going
> to be as alarming an issue for the normal Cygwin user as it is for
> people who, e.g., rebuild their own compilers.

Which would speak for adding a "nosparse" mount option.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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