Hello there,
After having compiled gzip, I had looked at the Makefile
“./configure” generated.
Looking at CFLAGS=”” (system configuration section), not many
compiler flags are specified for optimization.
The “Specific Targets” section sets different flags for
different systems, which are set accordingly.
Currently, I am looking at “CFLAGS= -O”.
I noticed that some optimization flags were not set (curious as
to why):
- -march=native (pentium3, athlon64, etc) (produces code for the
specific architecture specified)
- -O2 (recommended level to use to increase code performance )
- -pipe (makes compilation process faster)
- -fomit-frame-pointer (reduces generated code size)
Also, I found this article
http://lists.gnu.org/archive/html/bug-gzip/2013-02/msg00000.html and it
mentions setting –O2 and encountering an issue (it has since been fixed).
After running some tests after I recompiled (Linux), sometimes I noticed it
to be a little bit faster (at times) on x86_64.
Note: There are many different conditions that cause the numbers to
fluctuate, such as: # of processes running, ram usage, CPU power etc.
Thank You
