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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~/awork/dealii-work/examples/step-8$ make release run
[100%] Run step-8 with Release configuration
Cycle 0:
Number of active cells: 64
Number of degrees of freedom: 375
Peak virtual memory: 600 MB, Peak resident memory: 47 MB
Cycle 1:
Number of active cells: 204
Number of degrees of freedom: 1059
Peak virtual memory: 1069 MB, Peak resident memory: 51 MB
Cycle 2:
Number of active cells: 708
Number of degrees of freedom: 3231
Peak virtual memory: 1072 MB, Peak resident memory: 56 MB
Cycle 3:
Number of active cells: 2388
Number of degrees of freedom: 9891
Peak virtual memory: 1083 MB, Peak resident memory: 71 MB
Cycle 4:
Number of active cells: 7484
Number of degrees of freedom: 29277
Peak virtual memory: 1114 MB, Peak resident memory: 104 MB
Cycle 5:
Number of active cells: 23220
Number of degrees of freedom: 82779
Peak virtual memory: 1203 MB, Peak resident memory: 193 MB
Cycle 6:
Number of active cells: 71996
Number of degrees of freedom: 247185
Peak virtual memory: 1470 MB, Peak resident memory: 468 MB
Cycle 7:
Number of active cells: 223140
Number of degrees of freedom: 743361
Peak virtual memory: 2276 MB, Peak resident memory: 1300 MB
~/awork/dealii-work/examples/step-17$ make release run
[100%] Run step-17 with Release configuration
Cycle 0:
Number of active cells: 64
Number of degrees of freedom: 375 (by partition: 375)
Solver converged in 6 iterations.
Peak virtual memory: 786 MB, Peak resident memory: 56 MB
Cycle 1:
Number of active cells: 204
Number of degrees of freedom: 1059 (by partition: 1059)
Solver converged in 10 iterations.
Peak virtual memory: 798 MB, Peak resident memory: 72 MB
Cycle 2:
Number of active cells: 708
Number of degrees of freedom: 3231 (by partition: 3231)
Solver converged in 17 iterations.
Peak virtual memory: 825 MB, Peak resident memory: 98 MB
Cycle 3:
Number of active cells: 2388
Number of degrees of freedom: 9891 (by partition: 9891)
Solver converged in 29 iterations.
Peak virtual memory: 908 MB, Peak resident memory: 182 MB
Cycle 4:
Number of active cells: 7484
Number of degrees of freedom: 29277 (by partition: 29277)
Solver converged in 48 iterations.
Peak virtual memory: 1142 MB, Peak resident memory: 416 MB
Cycle 5:
Number of active cells: 23220
Number of degrees of freedom: 82779 (by partition: 82779)
Solver converged in 74 iterations.
Peak virtual memory: 1798 MB, Peak resident memory: 1071 MB
Cycle 6:
Number of active cells: 71996
Number of degrees of freedom: 247185 (by partition: 247185)
Solver converged in 113 iterations.
Peak virtual memory: 3772 MB, Peak resident memory: 3045 MB
Cycle 7:
Number of active cells: 223140
Number of degrees of freedom: 743361 (by partition: 743361)
Solver converged in 156 iterations.
Peak virtual memory: 9709 MB, Peak resident memory: 8981 MB
