Different results in pelegant

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arahim
Posts: 26
Joined: 08 Jun 2012, 05:28

Different results in pelegant

Post by arahim » 26 Nov 2020, 02:12

During the tracking of the particles for instability study in the ring using pelegant (2019.1.1, Jun 27 2019), I am getting different results, when I am selecting 1node 32processors and 5nodes and 1 processor(per node). In one case vertical emittance is blowing, while in another it is stable. What is the criteria to select the correct number of nodes and processors. Tracked result is attached for
vertical_emit.jpg
the reference. I have attached txt file for impedance as .IMPE file is not getting attached.
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Test_file.rar
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michael_borland
Posts: 1796
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: Different results in pelegant

Post by michael_borland » 26 Nov 2020, 15:17

The results shouldn't depend on the number of cores or nodes in any significant way, unless perhaps you are using very few particles. That can introduce variations due to different random number sequences for quantum excitation.

I was unable to run your files because the impedance file is not included. I looked at the Imp_circ_pp_14mm_T_10GHz_8193.txt but don't know what the columns are.

--Michael

arahim
Posts: 26
Joined: 08 Jun 2012, 05:28

Re: Different results in pelegant

Post by arahim » 01 Dec 2020, 23:08

Yes, it is due to less number of particles. Thanks..

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