On Thu, May 15, 2014 at 05:08:10PM +0200, Marek Polacek wrote:
> On Thu, May 15, 2014 at 11:39:26AM +0100, Ramana Radhakrishnan wrote:
> > What's the overhead with bootstrap-ubsan ?
>
> I timed normal bootstrap and bootstrap-ubsan on x86_64, 24 cores,
> Intel(R) Xeon(R) CPU X5670 @ 2.93GHz (aka cfarm 20) and the results:
>
> --enable-languages=all
>
> real 35m10.419s
> user 204m5.613s
> sys 6m15.615s
>
> --enable-languages=all --with-build-config=bootstrap-ubsan
>
> real 71m39.338s
> user 347m53.409s
> sys 7m44.281s
Note that doesn't mean -fsanitize=undefined generated code is twice as slow
as code compiled without it, guess most of the extra overhead is actually
compile time (mostly larger cfg due to all the extra checks).
Jakub
