On 02.10.15 10:57, Laurent Bourgès wrote:
Sergey,
I tried your gcc options on my ubuntu 14.4 (v4.8.4) and it is actually
slightly faster: 10% on my fill ellipse test (450ms vs 490ms).
I tested by your jmh test, and the difference became bigger on 1400 size.
Do you know which gcc compiler and options are used to build JavaSE EA?
I guess that compiler options in makefile are the same.
plus some default gcc options:
jdk8:
gcc (GCC) 4.3.0 20080428 (Red Hat-8) C compiler version 4.3.0-8)
jdk9:
gcc-4.8.2 - OEL5.5
Moreover, the linux distrib may define default options.
I will try to figure out all compiler options (command line + defaults)
on my machine.
It is not simple to find an option, which will help for everyone. Two
options suggested by me is a minimum number from -O3 to get the maximum
performance, both seems reasonable. Actually if I change the -O2 to
-O3(OPTIMIZATION := LOW =>> OPTIMIZATION := HIGHEST) performance became
worse.
What is your build environment ?
Ubuntu 14.04 gcc 4.8.4
--
Best regards, Sergey.
