Yeah that was the issue. I had softening set to 0. Thanks for the help.
On Thu, September 17, 2009 20:13, Javiera Guedes wrote:
>
> 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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>>
>
>
>
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--
Dimitry Ayzenberg
Carnegie Mellon University
Physics - Class of 2012
Cell:(732)-425-4534
Email: dayzenbe_at_andrew.cmu.edu
Received on 2009-09-18 16:54:31