We noticed that -ttp2 (target Itanium 2 processor) is the default for the ecc and efc compilers on all Itanium-based systems. We are trying to decide whether to change the default to -tpp1 on our Itanium 1 cluster, by adding it to the configuration files (efc.cfg , ecc.cfg).
Is there any empirical data that show the -tpp1 option typically produces faster code for the Itanium 1 processor? Also, is there data that show the -tpp1 code will run slower on the Itanium 2 processor?
National Center for Supercomputing Applications
University of Illinois