On 08/09/2020, 1:01, "Tom Lane" <t...@sss.pgh.pa.us> wrote:
> I wonder what version of gcc you intend this for. AFAICS, older > gcc versions lack this flag at all, while newer ones have it on > by default. (previously sent private reply, sorry) The moutline-atomics flag showed substantial enough improvements that it has been backported to GCC 9, 8 and there is a gcc-7 branch in the works. Ubuntu has integrated this in 20.04, Amazon Linux 2 supports it, with other distributions including Ubuntu 18.04 and Debian on the way. all distributions, including the upcoming Ubuntu with GCC-10, have moutline-atomics turned off by default.