On Tue, Jul 5 2022 at 01:42:05 PM +0200, Fabio Valentini
<decathorpe@xxxxxxxxx> wrote:
No - I think the problem is that adding those flags to the default
build configuration will affect the whole system - all executables and
shared libraries, not only "leaf" binaries. And that makes your
benchmarks (and those run by phoronix) basically useless for what
we're discussing here, because they only measure performance impact
when compiling the executables but not *the whole world* with those
flags, including all shared libraries that are used by executables
you're benchmarking.
So applying this change globally would, I assume, add to (or even
multiply) the negative effect wrt/ performance, so the effect will
likely be (much?) bigger than the few percent that were mentioned in
this thread?
This is a good point. I suppose we need further investigation here to
understand the true performance impact.
That said, this point cuts both ways. Recompiling the entire distro in
order to add frame pointers is a significant effort, and a very high
burden to ask of anyone looking to do performance work.
Michael
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