On 02/25/2013 06:09 PM, Jeffrey Walton wrote: > GCC 4.8 added a couple of interesting flags > (http://gcc.gnu.org/gcc-4.8/changes.html): -fsanitize=address and > -fsanitize=thread. Some reading about them is available at > http://llvm.org/devmtg/2012-11/Serebryany_TSan-MSan.pdf. > > It might be helpful to projects if the auto tools enabled one or both > by default. The overhead on Address Sanitizer looks small compared to > the payoff.
That paper said address sanitizer added 2x slowdown (20x under valgrind), and would need hardware support to cut the slowdown to only 20%. It also said thread sanitizer added 20x to 300x slowdown. That sounds like neither one should be enabled by default, but are best used during development. But thanks for pointing them out - they sound interesting. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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