Can we initialize the global variables? about byte-unixbench

[gstrauss]

Is there a measurable difference in the performance tests if the global variables are in the .data section or the .bss section?

The latest gcc stable release is gcc 13.2 (https://gcc.gnu.org/releases.html)

[huyubiao]

Is there a measurable difference in the performance tests if the global variables are in the .data section or the .bss section?

The latest gcc stable release is gcc 13.2 (https://gcc.gnu.org/releases.html)

• I tried to test with dhry_1.c and dhry_2.c in 13.2: when using -fno-common the performance is around 9200, but with -fcommon the performance is above 9500. After the global non-static variables in dhry_1.c are initialized and -fcommon is used, the performance returns to 9200. On gcc 10.3 the difference in performance is sometimes greater than 10%.
• By the way: I was using Intel Sapphire Rapids when it comes to the CPU architecture. This problem may not exist on other architectures.
• I mean, is it possible to unify here: 1. Initialize global non-static variables; 2. Explicitly use -fno-common during compilation.