1

ORC Performance on Itanium 2/Linux

• Testing environment: 4-way 900 MHz Itanium2 , 16K L1 DCache,16K L1 ICache, 256K

L2 Cache, 3M L3 Cache, 1G Mem, RH 7.2 Compiled with SPEC base options for Ecc 7.0 and –O3 for Gcc 3.1 Linked with standard libraries on Linux

• ORC 2.1 at 5% from ECC 7.0 and 30% ahead of Gcc 3.1

0.000.100.200.300.400.500.600.700.800.901.001.101.20 ORC

ECC

GCC

2

How to get the ORC peak performance?

• Options for the three passes of compilation: 1st pass: "-O3 -fb_create fb.mid -fb_type=1 -fb_phase=0

-ipa"• For eon: "-O3 -fb_create fb.mid -fb_type=1 -fb_phase=0 -INLINE:none"

2nd pass: "-O3 -fb_opt fb.mid -fb_create fb.mid -fb_type=10 -fb_phase=4 -ipa"

3rd pass: "-O3 -fb_opt fb.mid –ipa” Compilation options specified by SPEC are not listed here. Additional options may be needed for different

configurations.