c++ code executes very slowly - sjlj EH to blame?

Larry Hall lh-no-personal-replies-please@cygwin.com
Thu Dec 16 00:45:00 GMT 2004

At 05:23 PM 12/15/2004, you wrote:
>My app runs about 6 times faster on linux than cygwin,
>even though it spends the bulk of its time doing pure
>computation in user-space: strace shows a minimum of
>system calls being made.  Profiling shows that the
>culprit could be sjlj (set-jump/long-jump) EH.
>After googling around a bit, I found that other folks
>seem to have had a similar experience...
>Does anyone know how to build a gcc/g++ that use
>DWARF2 EH, instead of ... what we might call "abort()"
>EH?  I would very much like to try this out - to see
>if it will bring performance of my app on cygwin out
>of the toilet.
>Also - is it likely that cygwin will move away from
>sjlj EH soon?  

I'll let googling answer this question for you too. :-)

Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     

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