Re: Fwd: [Bug c++/14563] octave built under Cygwin very slow]

[Paul Thomas]

Paul,

> I have read as much as this thread as I can, including all the traffic on
> the gcc bugzilla report.  I gather that there are two issues, possibly
> related: 1) SJLJ exceptions and 2) allocations w/ new are very slow.  My
> question is do these issues still exist in the cygwin-distribution of gcc
> 3.4.4 (where SJLJ is enabled)?  Is the problem present in the currently
> distributed octave executable in cygwin?
>  

The two issues are related, as the correspondence in the PR shows.  I 
believe that other features in C++ are slowed up by SJLJ exceptions too 
(vtable access?) because I could never make the timing figures or the 
profiling come close to adding up.

I only build octave with a dwarf2-enabled gcc-3.2 and have been sticking 
to an ancient version of Cygwin, where memory limits are not an issue. 
I therefore cannot answer your questions.  To judge by the 
correspondence on the octave lists, I would think that the answers to 
both would be "yes".

Best wishes

Paul Thomas