Pete,
you need to make sure that the codes do exactly the same thing. I haven't
compared the codes too much but they use different preconditioners. This
will impact how much memory you will use.
Best,
Bruno
On Monday, July 25, 2016 at 1:59:53 PM UTC-4, Pete Griffin wrote:
>
> I found that running step-8 and step-17 on a single processor Intel® Core™
> i7-3630QM CPU @ 2.40GHz × 8 used substantially more Peak resident memory (>
> 5x) than I thought it would. This surprised me since I thought from reading
> step-17 that the memory increase was on the order of the solution vector
> which should have been << 2x greater. I verified some of the larger memory
> usage numbers using top.
>
> Is my assumption correct that 5x Peak resident memory is more than it
> should be?
>
> The results of other simulations with a beam with body-force load and with
> traction loads with and without HP and with and without MPI/PETSc all show
> the same results and they agree with beam theory.
>
> The output of the modified step-8.cc and step-17.cc are attached along
> with a plot of peak virtual memory and peak resident memory
> vs. DOF. The changes between the original distributed step-8 and step-17,
> with comments and extra newlines excluded (modified file >), are as below:
>
> Thanks beforehand
>
> Pete Griffin
>
>
> ======================================================================================
> diff ~/Documents/Zipstore2/dealii-8.4.1-PETSc/examples/step-8/step-8.cc
> step-8.cc
> 56c47,48
> < // This again is C++:
> ---
> > #include <deal.II/base/utilities.h>
>
> 767a394,402
> >
> > Utilities::System::MemoryStats stats;
> > Utilities::System::get_memory_stats(stats);
> > std::stringstream Str;
> >
> > Str.str("");
> > Str << " Peak virtual memory: " << stats.VmSize/1024 << " MB,
> Peak resident memory: "
> > << stats.VmRSS/1024 << " MB" << std::endl;
> > std::cout << Str.str();
>
> 781c411
> < Step8::ElasticProblem<2> elastic_problem_2d;
> ---
> > Step8::ElasticProblem<3> elastic_problem_2d;
>
>
> ======================================================================================
> diff ~/Documents/Zipstore2/dealii-8.4.1-PETSc/examples/step-17/step-17.cc
> ../step-17/step-17.cc
> 84a50
> > #include <deal.II/base/utilities.h>
> 1015c355
> < for (unsigned int cycle=0; cycle<10; ++cycle)
> ---
> > for (unsigned int cycle=0; cycle<8; ++cycle)
> 1018d357
> <
> 1022c361
> < triangulation.refine_global (3);
> ---
> > triangulation.refine_global (2);
> 1049a383,391
> >
> > Utilities::System::MemoryStats stats;
> > Utilities::System::get_memory_stats(stats);
> > std::stringstream Str;
> >
> > Str.str("");
> > Str << " Peak virtual memory: " << stats.VmSize/1024 << " MB,
> Peak resident memory: "
> > << stats.VmRSS/1024 << " MB" << std::endl;
> > std::cout << Str.str();
> 1073,1074c403
> <
> < ElasticProblem<2> elastic_problem;
> ---
> > ElasticProblem<3> elastic_problem;
>
>
> =============================================================================================
>
>
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