On Fri, Aug 21, 2009 at 8:22 AM, Mani chandra<mchan...@iitk.ac.in> wrote: > Ondrej Certik wrote: >> On Mon, Aug 17, 2009 at 11:06 AM, William Stein<wst...@gmail.com> wrote: >> >>> On Mon, Aug 17, 2009 at 6:27 AM, Mani chandra<mchan...@iitk.ac.in> wrote: >>> >>>> William Stein wrote: >>>> >>>>> On Mon, Aug 17, 2009 at 2:26 AM, Juan Jose >>>>> Garcia-Ripoll<juanjose.garciarip...@googlemail.com> wrote: >>>>> >>>>> >>>>>> On Mon, Aug 17, 2009 at 10:57 AM, William Stein<wst...@gmail.com> wrote: >>>>>> >>>>>> >>>>>>> Note that Sage's Maxima uses ECL. So the basic question is, how can >>>>>>> we increase the memory that Maxima + ECL can use? >>>>>>> >>>>>>> >>>>>> The limits ECL has are by default too small for big applications, but >>>>>> it is intentionally done so. However, changing them is pretty easy: >>>>>> add a call to ext:set-limit in any file of maxima that forms part of >>>>>> the final executable. >>>>>> >>>>>> The different memory limits that can be independently controlled are >>>>>> listed here >>>>>> http://ecls.sourceforge.net/new-manual/re34.html >>>>>> So for instance, in your case, which hits the dynamically allocated >>>>>> memory limit, you might add the following >>>>>> (ext:set-limit 'ext:heap-size (* 1024 1024 1024)) >>>>>> to maxima/src/ecl-port.lisp in order get 1GB memory limit. >>>>>> >>>>>> Juanjo >>>>>> >>>>>> >>>>> Thanks!!! I've made this trac #6772: >>>>> >>>>> http://trac.sagemath.org/sage_trac/ticket/6772 >>>>> >>>>> -- William >>>>> >>>>> >>>>> >>>> Hi, >>>> >>>> I'm glad that this issue has finally been taken up. But as an interm >>>> measure, how does one pass this command through a sage code? I tried >>>> maxima.eval_String, but it doesn't seem to work. >>>> >>> My understanding is that one has to modify the maxima source code >>> itself and recompile maxima. >>> >>> >>>> In an unrelated note, I rewrote my code trying to use a standalone >>>> installation of sympy and it takes forever to compute what maxima in >>>> sage did in a few mins, so I guess sympy is nowhere close to "industrial >>>> strength". >>>> >>>> Mani chandra >>>> >>>> >>> You should post your program to the sympy list and complain. I'm sure >>> they would love to fix whatever is making it so slow. A lot of people >>> are actively working on sympy this summer. >>> >> >> Could you please post your program to us? I just spent 3 months >> working on MHD in Los Alamos and as a SymPy developer I would love to >> see your real life application and what makes it slow and fix it. >> >> Thanks, >> Ondrej >> >> > >> >> > Hi, > I've attached the code. It basically constructs a set of coupled > equations for each velocity and magnetic field mode, which I can then > analyse for various non-linear phenomenon. I'm not fully done with the > code yet, however most of it is there. The time consuming step is the > select_mode() function, which does an inner product of an expression > with a chosen mode and the picks up the co-efficients of that mode.
Thanks a lot, indeed, it hangs for me there as well. I'll look at it and see how to speed it up. Can I put your code into our examples in sympy? It's a real life application, where you actually wanted to get some results done, so that's a real benchmark, where I would like sympy to be fast. I'll report back, once I make some progress. Ondrej --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
