Am 10.07.2013 um 13:54 schrieb Makarius <makar...@sketis.net>: > On Wed, 10 Jul 2013, Fabian Immler wrote: > >> For his Bachelor's thesis he needs to carry out performance measurements on >> a machine with many cores (isabelle-server). > > What is this project anyway? It is about evaluating libraries for parallelism in Haskell, in Markus' case Repa [1]. Yutaka uses Isabelle to generate code for another library, DPH [2]. There have been disappointing measurements, but they were mostly due to the fact that both libraries are still under development.
Fabian [1] http://repa.ouroborus.net/ [2] http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell > > Note that isabelle-server has many cores (24), but the hardware structure is > made for many independent processes (e.g. virtual machines), not applications > that use shared-memory multithreading. Thus the results of measurement might > be a bit disappointing, depending on the kind of application. > > Intel Xeons (especially after Nehalem from 2009) are usually much better; > macbroy2 is the classic machine for that, although it is getting a bit old > now; I have the follow-up model in my office since 2010. It is possible to > get a real warp factor of 9.6 for parallel Isabelle in the best situation (8 > cores with hyperthreading). > > I have seen a really hot 16-core Xeon at TUM recently, but it seems to belong > to a different "Lehrstuhl" that is subject to the same system administration. > It runs some boring batch process with 16 threads since a couple of > weeks/months. > > > Makarius _______________________________________________ isabelle-dev mailing list isabelle-...@in.tum.de https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev
