For a real performance increase use Intel's icc compiler, while gcc 3.2 gives about 10% increase icc will give more than 30% faster running code than 2.96. Cheers, Fons. On Fri, 2003-05-09 at 09:58, Andrzej Kupsc wrote: > Thank you for the answer. We haven't found explanation for decreased > performance of compiled $ROOTSYS/test/hsimple.cxx. One other thing > which we would like to try is to use g++ 3.2 compiler. > Maybe somebody has experience if one can expect big > performance difference between code compiled with gcc 2.96 (RH 7.1-7.3 standard) > and gcc 3.2? > > Andrzej Kupsc > > > > On Fri, 9 May 2003, Rene Brun wrote: > > > Hi Andrzej, > > > > I cannot reproduce this problem with $ROOTSYS/test/hsimple.cxx. > > > > The main difference between 3.04 and 3.05 is the introduction by default > > of the True Type Fonts. If you run the benchmarks.C with 3.04 without > > using TTF and 3.05 with TTF, you may see a factor 2 on graphics > > applications. If you use the new 3.05/05, you can disable TTF in system.rootrc. > > We will work on the speed improvements with TTF. > > > > Rene Brun > > > > Andrzej Kupsc wrote: > > > > > > Hej, > > > > > > We have found that some of our root based applications seems to run > > > 2-4 times slower with root_v3.05.04 as compared to root_v3.04.02. > > > > > > In order to find the reason of decreased performance we have run standard > > > root benchmarks with precompiled root versions as well as root_v3.05.04 > > > compiled from sources. > > > The comparison was done on the same computers with the only difference > > > being root version used. Most dramatic difference is with > > > $ROOTSYS/test/hsimple.cxx which seems to be more than 4 times slower with > > > ROOT 3.05/04. > > > Does anyone observed similar decrease of performance with root_v3.05.04 > > > or have hints what could be wrong? > > > > > > Andrzej Kupsc > > > --------------------------------------------------------------- > > > The Svedberg Laboratory, > > > Uppsala University, Uppsala. > > > --------------------------------------------------------------- -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
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