------- Comment #16 from Tobias dot Schlueter at physik dot uni-muenchen dot de 2005-11-01 22:31 ------- Subject: Re: Really, really, horrible IO performance
jblomqvi at cc dot hut dot fi wrote: > It depends on what you consider "really, really horrible IO performance". ;-) > Getting rid of mmap (the patch referred to above) improved performance by a > factor of 25, and I think before I made those measurements there were some > patches committed which made the mmap window bigger or somesuch, improving > performance compared to the situation when the bug was filed. So IMHO we have > made huge improvements. > > OTOH we still lose to ifort by a factor of 6 or so. The major reason is that > ifort does bulk transfers for implied do loops, while gfortran doesn't. > Changing the code to use array transfers makes gfortran only about a factor of > 1.5 slower than ifort. > > Personally, I think we can keep the bug around for reference, but change the > priority to "enhancement". We could probably close this as a duplicate of PR16339. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21820