compiling always generates fast code?
cswiger at mac.com
Mon Feb 26 02:47:49 UTC 2007
deeptech71 at gmail.com wrote:
> Do you get processor-specific code when you do buildworld and
> buildkernel, particularly on a -RELEASE?
No, not unless you've configured the kernel Makefile and /etc/make.conf to
include processor-specific CFLAGS. See /usr/share/examples/etc/make.conf.
> Does building from ports always automatically optimize code (vs packages)?
Both ports and packages are optimized at the default level of "-O", unless you
set it otherwise. The kernel & world are known to be safe building using:
> Do I need to strip some files after the compilation (world, kernel,
> ports) to get the absolute maximum performance?
> Any other tips to speed up executables?
Sure, benchmark performance and make sure you run any self-testing routines
("make test" or "make check", usually) when you experiment with non-default
Pay attention to whether you obtain significant gains by using non-default
optimizations, because the answer generally varies in different situations and
on different CPU types.
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