On Sat, Apr 11, 2020 at 10:23:54PM +0200, Florian Weimer wrote: > Or put differently: If upstream doesn't want to default to > -moutline-atomics, why should Debian?
Well, ultimately we own our build configurations and the optimizations we enable therein. If we don't want to enable -moutline-atomics globally, then a second, optimized library is also an option. IMO, timing data like these should be enough to show that it's worth making a change somewhere: # 100 serial invocations of the "a.c" program attached to the bug # report, linked against libc with -moutline-atomics real 0m1.902s user 0m3.488s sys 0m25.498s # 100 invocations of the same program linked against glibc with # -march=armv8.1-a real 0m1.844s user 0m3.137s sys 0m24.275s # 100 invocations of the same program against our current libc build: real 8m15.452s user 130m33.139s sys 0m1.162s noah
