Re:Impact of Undefined Behavior on Performance
by jcelerier on Friday July 09, 2021 @03:04AM
(#27781155)
> Because memory access patterns, system call overhead, operating system interaction etc. have much more impact on overall performance
In most media apps, the actually processing intensive part definitely does not do syscalls or OS interaction. It's pure computations for as long as possible (and often non-parallelizable, e.g. x[i] *= x[i-1] sort of things). Disabling those optimisations is a killer.
In most media apps, the actually processing intensive part definitely does not do syscalls or OS interaction. It's pure computations for as long as possible (and often non-parallelizable, e.g. x[i] *= x[i-1] sort of things). Disabling those optimisations is a killer.