I am using -O3. This is the only flag apart from the profile flag -fprofile-use.
I had independently tried -march=pentium4 and that did not buy any performance for this app. -girish --- Kelley Cook <[EMAIL PROTECTED]> wrote: > > I started with a clean slate in my build > environment > > and did not have any residual files hanging > around. > > Are the steps I have indicated in my earlier email > > > correct. Is there a way I can break down the > problem > > into a smaller sub-set of flags and eliminate the > flag > > causing the performance problem. What I mean is > since > > -fprofile-generate and -fprofile-use enable a > bunch of > > flags, would it make sense to avoid profiling and > try > > out some of the individual flags on a trial and > error > > basis. If so what would be the flags to start the > > trials with. > > > > -girish > > Before we go any farther, are you sure that you are > also turning on optimization with -fprofile-generate > and -fprofile-use? > > In other words, you aren't just using "gcc > -fprofile-generate xxx.c" to create your object > files are you? > > You need to use something like "gcc -O2 > -march=pentium4 -fprofile-generate" as unoptimized > profiles are pretty pointless. > > Instead of general terms, specific examples would > help a lot. Like a link to your code that is having > problems. > > Kelley Cook > >
