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From: ISAAC SHLOSMAN <shlosman_at_pa.uky.edu>

Date: Mon, 31 Oct 2016 21:08:40 -0400

Hi Raymond,

This because your extreme dynamic range and a finite number of time bins

results in dt going to 0. Find a way to decrease dynamic range

Isaac

On Oct 31, 2016 7:45 PM, "Raymond Carlberg" <raymond.carlberg_at_utoronto.ca>

wrote:

*> HI – I am running Gadget2 on a 32 node machine. Works well for more than
*

*> 10,000 steps, then dt goes to zero with no complaints from the program so
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*> the run continues for some time with no progress. DONOTSTOP is not
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*> implemented. Softenings are good. TreeAllocFactor boosted, etc, but no go .
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*> The gravity calculation has extreme density ranges.
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*>
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*> --Ray
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*>
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*>
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*>
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*> Restarting shows a possible problem (Nf=0 below):
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*>
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*> Step= 9 t= 1.55115 dt= 0.000128937
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*>
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*> Nf= 0000064647 total-Nf= 0001622692 ex-frac= 21.9985 iter= 1
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*>
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*> work-load balance: 18.532 max=4.10968 avg=0.221762 PE0=1.98117
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*>
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*> particle-load balance: 4.77931
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*>
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*> max. nodes: 37131, filled: 0.0066013
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*>
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*> part/sec=4554.93 | 245.788 ia/part=5650.51 (0)
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*>
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*>
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*>
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*> Step= 10 t= 1.55115 dt= 0
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*>
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*> Nf= 0000000000 total-Nf= 0001622692 ex-frac= -nan iter= 0
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*>
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*> work-load balance: -nan max=0 avg=0 PE0=0
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*>
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*> particle-load balance: 4.77931
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*>
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*> max. nodes: 37131, filled: 0.0066013
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*>
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*> part/sec=0 | -nan ia/part=-nan (-nan)
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*>
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*>
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*>
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*> ^^^^^^^^^^^^^^^^^^^and the output at the time of the problem.
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*>
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*>
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*>
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*> Begin Step 13838, Time: 1.55121, Systemstep: 0.000152588
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*>
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*> domain decomposition...
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*>
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*> NTopleaves= 4124
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*>
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*> work-load balance=36.5349 memory-balance=4.45177
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*>
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*> exchange of 0000288372 particles
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*>
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*> domain decomposition done.
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*>
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*> begin Peano-Hilbert order...
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*>
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*> Peano-Hilbert done.
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*>
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*> Start force computation...
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*>
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*> Tree construction.
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*>
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*> Tree construction done.
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*>
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*> Begin tree force.
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*>
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*> tree is done.
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*>
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*> force computation done.
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*>
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*>
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*>
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*> Begin Step 13839, Time: 1.55121, Systemstep: 0
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*>
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*> Start force computation...
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*>
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*> Begin tree force.
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*>
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*> tree is done.
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*>
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*> force computation done.
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*>
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*>
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*>
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*>
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*>
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*>
*

*> -----------------------------------------------------------
*

*>
*

*> If you wish to unsubscribe from this mailing, send mail to
*

*> minimalist_at_MPA-Garching.MPG.de with a subject of: unsubscribe gadget-list
*

*> A web-archive of this mailing list is available here:
*

*> http://www.mpa-garching.mpg.de/gadget/gadget-list
*

*>
*

*>
*

Received on 2016-11-01 02:08:44

Date: Mon, 31 Oct 2016 21:08:40 -0400

Hi Raymond,

This because your extreme dynamic range and a finite number of time bins

results in dt going to 0. Find a way to decrease dynamic range

Isaac

On Oct 31, 2016 7:45 PM, "Raymond Carlberg" <raymond.carlberg_at_utoronto.ca>

wrote:

Received on 2016-11-01 02:08:44

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