On Thu, 13 Mar 2008, Miguel Mart?nez Canales wrote: MMC> Dear all,
dear miguel, a couple of comments: MMC> Laptop: MMC> example01 MMC> real 1m44.686s MMC> user 1m41.374s MMC> sys 0m1.864s MMC> example05 MMC> real 0m8.411s MMC> user 0m7.828s MMC> sys 0m0.140s those examples make bad benchmarks. they compute too little, what you are mostly seeing is the time to write the output... :) [...] MMC> Big Bad Itanium MMC> example01 MMC> real 1m48.417s MMC> user 2m15.136s MMC> sys 0m6.756s MMC> example05 MMC> real 0m13.028s MMC> user 0m12.775s MMC> sys 0m0.627s MMC> MMC> Is it normal that user time > real time even when I am running pw.x as MMC> mpirun -np 1 pw.x? Is it normal that my almost 4 year old laptop running a as of version 10, MKL defaults to automatically switching to multi-threaded at its own whim (see docs) unless you tell it to run serially. hence the user time increase. MMC> bloated distro is running the examples clearly faster than an Itanium MMC> machine? I swear I haven't used fancy flags anywhere, other than the MMC> default ones. I will also run espresso on an opteron machine, to see the MMC> results. you'll have to run an input that at least stays on the CPU for something of the order of 10mins to get some realistic numbers. cheers, axel. MMC> MMC> Regards, MMC> MMC> Miguel MMC> MMC> PS: I also swear that the very same Itanium machine used to run twice as MMC> fast as the same laptop, although the free FORTRAN compilers have changed a MMC> lot in the last couple of years. MMC> MMC> -- ======================================================================= Axel Kohlmeyer akohlmey at cmm.chem.upenn.edu http://www.cmm.upenn.edu Center for Molecular Modeling -- University of Pennsylvania Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323 tel: 1-215-898-1582, fax: 1-215-573-6233, office-tel: 1-215-898-5425 ======================================================================= If you make something idiot-proof, the universe creates a better idiot.
