sPHENIX tracking discussion

[Anthony Frawley <afrawley AT fsu.edu>]

Hello Sookhyun,

We get very good tracking performance with the new code, so the issue would be memory use and speed.  Both of those are poorer since the TPC clusterizer modification, and this might explain why that is.

Let's take it to a private list.

Thanks

Tony

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From: sookhyun lee <dr.sookhyun.lee AT gmail.com>
Sent: Saturday, July 1, 2017 8:11 PM
To: Anthony Frawley
Cc: pinkenburg; sphenix-tracking-l AT lists.bnl.gov
Subject: Re: [Sphenix-tracking-l] please update your tpc macro

 

Hi Tony,

These were not hits from reconstructed tracks, purely clusters in SvtxClusterMap before any tracking starts. Testing my seeding module, I print out all clusters that are on the seeding layers.

If we have 5 clusters per layer coming from 1 particle, we probably suffer from a large number of ghost tracks when we have 100 pions.

Best regards,

Sookhyun

On Jul 1, 2017 6:09 PM, "Anthony Frawley" <afrawley AT fsu.edu> wrote:

Hello Sookhyun,

I am running central Hijing events + 100 pions + 1 upsilon. I am scanning only embedded particles. When I plot the number of clusters per layer from the evaluator, I see about 0.9.

Can you be specific about where these printouts are located in the code?

Thanks

Tony

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From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of sookhyun lee <dr.sookhyun.lee AT gmail.com>
Sent: Saturday, July 1, 2017 6:46 PM
To: pinkenburg
Cc: sphenix-tracking-l AT lists.bnl.gov
Subject: Re: [Sphenix-tracking-l] please update your tpc macro

 

Hi Chris and Carlos,

I ran a single pion (single track in an event) and noticed that the number of TPC clusters for a track per a TPC layer is ~5 as compare to ~1 before the change. I worry that this will generate a large number of ghost tracks.

Carlos, could you please take a look into it? 

Thanks,

Sookhyun

Please find more information on the TPC clusters generated from a single pion. Layer 7 is the first layer of the TPC. 

 adding cluster, id =  0, layer = 3

 adding cluster, id =  1, layer = 4

 adding cluster, id =  2, layer = 5

 adding cluster, id =  3, layer = 6

 adding cluster, id =  4, layer = 0

 adding cluster, id =  5, layer = 1

 adding cluster, id =  6, layer = 2

 adding cluster, id =  7, layer = 7

 adding cluster, id =  8, layer = 7

 adding cluster, id =  9, layer = 7

 adding cluster, id =  10, layer = 7

 adding cluster, id =  11, layer = 7

SimpleHit3D: id: 7 layer: 7 (x,y,z) = (-17.7106,-24.702,10.8538)

       ( 1.1744e-07 , -8.42012e-08 , 0 )

err  = ( -8.42012e-08 , 6.03698e-08 , 0 )

       ( 0 , 0 , 1.69597e-07 )

       ( 4.06825e-07 , -2.91682e-07 , 0 )

size = ( -2.91682e-07 , 2.09127e-07 , 0 )

       ( 0 , 0 , 5.87502e-07 )

SimpleHit3D: id: 8 layer: 7 (x,y,z) = (-17.4856,-24.8618,11.0598)

       ( 8.52803e-06 , -5.99789e-06 , 0 )

err  = ( -5.99789e-06 , 4.2184e-06 , 0 )

       ( 0 , 0 , 2.04e-05 )

       ( 2.9542e-05 , -2.07773e-05 , 0 )

size = ( -2.07773e-05 , 1.4613e-05 , 0 )

       ( 0 , 0 , 7.06678e-05 )

SimpleHit3D: id: 9 layer: 7 (x,y,z) = (-17.3943,-24.9258,11.1125)

       ( 0.000214193 , -0.000149473 , 0 )

err  = ( -0.000149473 , 0.000104309 , 0 )

       ( 0 , 0 , 0.00104963 )

       ( 0.000741986 , -0.000517789 , 0 )

size = ( -0.000517789 , 0.000361335 , 0 )

       ( 0 , 0 , 0.00363603 )

SimpleHit3D: id: 10 layer: 7 (x,y,z) = (-17.7837,-24.6494,10.5171)

       ( 3.009e-05 , -2.17089e-05 , 0 )

err  = ( -2.17089e-05 , 1.56622e-05 , 0 )

       ( 0 , 0 , 1.95593e-05 )

       ( 0.000104235 , -7.52018e-05 , 0 )

size = ( -7.52018e-05 , 5.42555e-05 , 0 )

       ( 0 , 0 , 6.77554e-05 )

SimpleHit3D: id: 11 layer: 7 (x,y,z) = (-17.9813,-24.5057,11.1276)

       ( 1.15831e-06 , -8.49925e-07 , 0 )

err  = ( -8.49925e-07 , 6.23642e-07 , 0 )

       ( 0 , 0 , 0.00240514 )

       ( 4.01251e-06 , -2.94423e-06 , 0 )

size = ( -2.94423e-06 , 2.16036e-06 , 0 )

       ( 0 , 0 , 0.00833165 )

On Sat, Jul 1, 2017 at 10:34 AM, pinkenburg <pinkenburg AT bnl.gov> wrote:

Hi folks,

the tpc macro has been updated for the changes in the tpc clusterizer and the running time is back to normal. The code is back in and a build is ongoing (give it 30 minutes). Please pull the updated macro from github - or wait a really long time :)

Chris

--
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Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory  ;    phone: (631) 344-5692
Physics Department Bldg 510 C   ;    fax:   (631) 344-3253
Upton, NY 11973-5000

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