Re: [SPAM] tree-node error

From: Yan-Rong Li <liyanrong_at_mail.ihep.ac.cn>
Date: Sun, 24 Oct 2010 11:52:43 +0800

Hi, Shankar

task 0: maximum number 671088 of tree-nodes reached.

is one of common errors that happens when performing tree construction.

Larger value of TreeAllocFacparameter may settle this error.

There are many previous discussions. You can refer to, e.g. http://www.mpa-garching.mpg.de/gadget/gadget-list/0029.html

Cheers,
Yan-Rong

On 10/24/2010 01:23 AM, Agarwal, Shankar wrote:
> Hi,
>
> I tried running a N-body simulation with N_gas=N_cdm=64^3 particles in a 256Mpc/h box. I generated the gas+CDM ICs using ZA+2LPT.
>
> The simulation quits with this error message:
>
> Type 0 (gas): 262144 (tot= 0000262144) masstab=78.144
> Type 1 (halo): 262144 (tot= 0000262144) masstab=479.52
> Type 2 (disk): 0 (tot= 0000000000) masstab=0
> Type 3 (bulge): 0 (tot= 0000000000) masstab=0
> Type 4 (stars): 0 (tot= 0000000000) masstab=0
> Type 5 (bndry): 0 (tot= 0000000000) masstab=0
>
> reading done.
> Total number of particles : 0000524288
>
> allocated 0.0762939 Mbyte for ngb search.
>
> Allocated 48.123 MByte for BH-tree. 64
>
> domain decomposition...
> NTopleaves= 64
> work-load balance=1 memory-balance=1
> domain decomposition done.
> begin Peano-Hilbert order...
> Peano-Hilbert done.
> Begin Ngb-tree construction.
> Ngb-Tree contruction finished
> ngb iteration 1: need to repeat for 0000158063 particles.
> ngb iteration 2: need to repeat for 0000000004 particles.
> ngb iteration 3: need to repeat for 0000000004 particles.
> ngb iteration 4: need to repeat for 0000000001 particles.
>
> Setting next time for snapshot file to Time_next= 0.019608
>
>
> Begin Step 0, Time: 0.0196078, Redshift: 50, Systemstep: 0, Dloga: 0
> domain decomposition...
> NTopleaves= 64
> work-load balance=1 memory-balance=1
> domain decomposition done.
> begin Peano-Hilbert order...
> Peano-Hilbert done.
> Start force computation...
> Starting periodic PM calculation.
>
> Allocated 26.0742 MByte for FFT data.
> done PM.
> Tree construction.
> task 0: maximum number 671088 of tree-nodes reached.
> for particle 380982
> task 0: endrun called with an error level of 1
>
> application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0
>
>
>
> Please let me know how may I deal with this.
>
> Regards
> Shankar Agarwal
> KU Cosmology Group
> University of Kansas,
> Lawrence,KS-66045,USA
>
Received on 2010-10-24 06:16:05

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