Re: Odd Error

From: Javiera Guedes <javiera_at_ucolick.org>
Date: Thu, 17 Sep 2009 17:13:10 -0700

Are you setting your softening to zero for one of the particles maybe?
As you know from reading the Gadget2 manual and the paper, the time
step is calculated from the softening and the acceleration.

On Sep 17, 2009, at 2:54 PM, Dimitry Ayzenberg wrote:

>
> I got this error when running a simulation and I'm not really sure
> what it
> means. Can someone help me please?
>
> dimitry_at_Phoenix:~/Desktop/Gadget-2.0.4/Gadget2$ ./Gadget2
> /home/dimitry/Desktop/Gadget-2.0.4/Gadget2/parameterfiles/test.param
> Note: This is a massively parallel code, but you are running with 1
> processor only.
> Compared to an equivalent serial code, there is some unnecessary
> overhead.
>
> This is Gadget, version `2.0'.
>
> Running on 1 processors.
>
> Allocated 5 MByte communication buffer per processor.
>
> Communication buffer has room for 119156 particles in gravity
> computation
> Communication buffer has room for 40960 particles in density
> computation
> Communication buffer has room for 32768 particles in hydro computation
> Communication buffer has room for 32768 particles in domain
> decomposition
>
>
> Hubble (internal units) = 4.66672e-05
> G (internal units) = 1
> UnitMass_in_g = 1.99e+30
> UnitTime_in_s = 1.44e+13
> UnitVelocity_in_cm_per_s = 1
> UnitDensity_in_cgs = 6.66447e-10
> UnitEnergy_in_cgs = 1.99e+30
>
>
> Allocated 0.0972748 MByte for particle storage. 68
>
>
> reading file `/home/dimitry/Desktop/Gadget-2.0.4/ICs/test.dat' on
> task=0
> (contains 1000 particles.)
> distributing this file to tasks 0-0
> Type 0 (gas): 0 (tot= 0000000000) masstab=0
> Type 1 (halo): 1000 (tot= 0000001000) masstab=1
> 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 : 0000001000
>
> allocated 0.0762939 Mbyte for ngb search.
>
> Allocated 0.847687 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
>
> Setting next time for snapshot file to Time_next= 0
>
>
> writing snapshot file...
> done with snapshot.
>
> Setting next time for snapshot file to Time_next= 0.03
>
>
> Begin Step 0, Time: 0, Systemstep: 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...
> Tree construction.
> Tree construction done.
> Begin tree force.
> tree is done.
> Begin tree force.
> tree is done.
> force computation done.
>
> Error: A timestep of size zero was assigned on the integer timeline!
> We better stop.
> Task=0 Part-ID=941 dt=nan tibase=1.11759e-08 ti_step=-2147483648
> ac=nan
> xyz=(-452|-490|-389) tree=(nan|nannan)
>
> task 0: endrun called with an error level of 818
>
>
> application called MPI_Abort(MPI_COMM_WORLD, 818) - process 0
>
> Thanks,
> Dimitry
>
>
>
>
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Received on 2009-09-18 02:13:15

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