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ORC Performance on Itanium/Linux

• Testing environment: HP i2000 WS: 733 MHz Itanium, 2M 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 on par with ECC 7.0 and 30% ahead of Gcc 3.1

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0.90

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1.10

1.20 ORCECCGCC

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

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

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

configurations.