On 27/01/14 15:06, Andrew Stitcher wrote:
I think that (too lazy to actually go look) in autotools the build
default was -O2 and the Fedora/RHEL packaging set -O3.
It is completely true that with cmake we've opted to follow the usual
cmake practice (which is standard on Windows too) of having the build
configuration dictate the optimisation/debug flags. I think that in the
Fedora/RHEL packages we now use the RelWithDebInfo build configuration
which corresponds to -O2 -g.
It is true that if you specify no CMAKE_BUILD_TYPE then you will get no
optimisation or debug flags set which is perhaps a rather bad idea.
What do you think the default build type should be? (Out of Debug = -g,
Release = -O2 -DNDEBUG, RelWithDebInfo -O2 -DNDEBUG -g, MinSizeRel = -Os
-DNDEBUG)
It's not clear to me that we should prioritise performance over
debugability in our default build.
Andrew
Thanks for the response Andrew - glad I'm not going mad :-D
I think that I'm *relatively* agnostic as to what the default should be,
but I definitely think that this stuff should be included in the
build/install instructions for qpid/proton/dispatch/etc. If you've got
familiarity with CMake it might be second nature, but I don't think we
should assume this (I only figured it out by accident, having only
fairly rudimentary CMake experience).
Out of curiosity looking at the list above I don't see an option that
does "-O3" what would that be? I'd like to eke the maximum performance
out of the components I'm running operationally - we've got some very
high throughput use cases so I'm keen to make sure that we don't hit
performance regressions as we upgrade from earlier Qpid versions.
Cheers,
Frase
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