https://community.intel.com/t5/Software-Archive/Questions-about-Profile-guided-Optimization/m-p/745647#M2021 Hi,<BR /><BR />I'd like to use the prof_gen with a Makefile for science computing optimization using MPI. The CPU is Xeon X7560.<BR /><BR />My questions are<BR /><BR />1. I wonder which one is more better, only using -O2 with prof-gen or more optimization options can be used at the same time<BR /><BR />a. -O2 -prof-gen -prof-dir/$HOME/profiled<BR />b. -w -O2 -xsse4.2 -xhost -prof-gen -prof-dir/$HOME/profiled<BR />c. -w -O3 -xsse4.2 -xhost -prof-gen -prof-dir/$HOME/profiled<BR /><BR />2. When I use -ipo with -prof-use, it always complains unsolved xxxx or undefined reference. But If I use -ip, it works fine with -prof-use. What's the problem?<BR /><BR />3. Are there any more optimization options available for Xeon CPU for the science computing using MPI?<BR /><BR />Thanks<BR /><BR />Jerry Mon, 24 Jan 2011 17:58:29 GMT jerryleo 2011-01-24T17:58:29Z https://community.intel.com/t5/Software-Archive/Questions-about-Profile-guided-Optimization/m-p/745647#M2021 Hi,<BR /><BR />I'd like to use the prof_gen with a Makefile for science computing optimization using MPI. The CPU is Xeon X7560.<BR /><BR />My questions are<BR /><BR />1. I wonder which one is more better, only using -O2 with prof-gen or more optimization options can be used at the same time<BR /><BR />a. -O2 -prof-gen -prof-dir/$HOME/profiled<BR />b. -w -O2 -xsse4.2 -xhost -prof-gen -prof-dir/$HOME/profiled<BR />c. -w -O3 -xsse4.2 -xhost -prof-gen -prof-dir/$HOME/profiled<BR /><BR />2. When I use -ipo with -prof-use, it always complains unsolved xxxx or undefined reference. But If I use -ip, it works fine with -prof-use. What's the problem?<BR /><BR />3. Are there any more optimization options available for Xeon CPU for the science computing using MPI?<BR /><BR />Thanks<BR /><BR />Jerry Mon, 24 Jan 2011 17:58:29 GMT https://community.intel.com/t5/Software-Archive/Questions-about-Profile-guided-Optimization/m-p/745647#M2021 jerryleo 2011-01-24T17:58:29Z