[Nek5000-users] run-time hang up in gs_setup

[nek5000-users at lists.mcs.anl.gov]

Hi Azad,

We have seen similar situations. I think this has to do with a known
bug. Unfortunately this bug is hard to reproduce and we haven't
managed to fix it yet.

-Stefan

On 1/10/12, nek5000-users at lists.mcs.anl.gov
<nek5000-users at lists.mcs.anl.gov> wrote:
>
> Hi Azad,
>
> You are in record-setting territory for element counts! :)
>
> Are you using the amg-based coarse-grid solver?
> It is certain that you will need to do this (and,
> therefore, you will need matlab to process the AMG
> operators).   There is some discussion of the steps
> on the wiki page.  We can walk you through this process
> if you have any questions.
>
> What value of lx1 are you using?
>
> I would recommend fewer elements and a higher value of lx1.
> I think it will be easier to manage the data, etc.
>
> Paul
>
>
>
>
>
> On Tue, 10 Jan 2012, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Dear NEKs;
>>
>> I am trying to run a simulation of a turbulent flow in a straight pipe
>> in high Reynolds number (Re_tau = 1000). After generating the grid with
>> PRENEK and extrude it using n2to3, the mesh ended up with 4,495,920
>> elements. It compiled properly; however, trying to run it, hanged up in
>> the last stage:
>> ########################################################################
>>
>> verify mesh topology
>>   -1.000000000000000         1.000000000000000       Xrange
>>   -1.000000000000000         1.000000000000000       Yrange
>>    0.000000000000000         25.00000000000000       Zrange
>> done :: verify mesh topology
>>
>>  E-solver strategy:  1 itr
>> mg_nx:            1            3
>> mg_ny:            1            3
>> mg_nz:            1            3
>> call usrsetvert
>> done :: usrsetvert
>>
>> gs_setup: 866937 unique labels shared
>>   pairwise times (avg, min, max): 0.000241442 0.00019722 0.000265908
>>   crystal router                : 0.000458177 0.000445795 0.000471807
>>   used all_to_all method: pairwise
>>   setupds time 5.6048E-02 seconds   1  2     4565612     4495920
>>   setvert3d:   4    86046564   122013924    86046564    86046564
>> call usrsetvert
>> done :: usrsetvert
>>
>> gs_setup: 8041169 unique labels shared
>>   pairwise times (avg, min, max): 0.00050716 0.000427103 0.00056479
>>   crystal router                : 0.0040165 0.00392921 0.00411811
>>   used all_to_all method: pairwise
>>   setupds time 1.0465E+00 seconds   2  4    86046564     4495920
>> setup h1 coarse grid, nx_crs=            2
>> call usrsetvert
>> done :: usrsetvert
>>
>> gs_setup: 866937 unique labels shared
>>   pairwise times (avg, min, max): 0.000233683 0.000197816 0.00024941
>>   crystal router                : 0.000466869 0.00045588 0.000478101
>>   used all_to_all method: pairwise
>> ########################################################################
>>
>>
>> I was wondering if you could help me with that. I attached the run
>> logfile and also genmap.out.
>>
>> Many thanks
>> Azad
>>
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