sPHENIX tracking discussion

[pinkenburg <pinkenburg AT bnl.gov>]

Hi folks,

I am playing with our new hardware using the current new build - it 
works pretty nice, for our last step which resembles the "real" tracking 
it goes through 10k MB minbias hijing events within a few hours. The 
memory and time per job is attached (it is about 80-90 events per file, 
we drop foreground events from outside our vertex cut), and... no more 
double/tripple peaks.

I do see two type of (rare) crashes which are reproducible. We don't 
have random number generators at that point and you can just run our 
Fun4All_G4_Trkr.C macro (just copy it to your macro/detector/sPHENIX 
checkout - it uses the generic G4Setup_sPHENIX.C in there):
https://github.com/sPHENIX-Collaboration/MDC2/blob/main/submit/fm_0_20/pass4trk/rundir/Fun4All_G4_Trkr.C

Just run it like:
root.exe -q -b 
Fun4All_G4_Trkr.C\(0,\"DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-08417.root\"\) 



DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-03116.root
results in
root.exe: 
/cvmfs/sphenix.sdcc.bnl.gov/gcc-8.3/release/release_new/new.2/include/Acts/EventData/SingleBoundTrackParameters.hpp:61: 
Acts::SingleBoundTrackParameters<charge_t>::SingleBoundTrackParameters(std::shared_ptr<const 
Acts::Surface>, const ParametersVector&, 
Acts::SingleBoundTrackParameters<charge_t>::Scalar, 
std::optional<Eigen::Matrix<double, 6, 6, 0, 6, 6> >) [with charge_t = 
Acts::SinglyCharged; 
Acts::SingleBoundTrackParameters<charge_t>::ParametersVector = 
Eigen::Matrix<double, 6, 1, 0, 6, 1>; 
Acts::SingleBoundTrackParameters<charge_t>::Scalar = double]: Assertion 
`(0 <= (params[eBoundQOverP] * q)) and "Inconsistent q/p and q signs"' 
failed.

DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-03170.root
DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-04880.root
DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-05015.root
DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-07310.root
DST_TRKR_HIT_sHijing_0_20fm_50kHz_bkg_0_20fm-0000000002-08417.root
result in
/home/phnxbld/sPHENIX/gcc-8.3/new/source/coresoftware/offline/framework/fun4all/Fun4AllServer.cc:586: 
caught exception thrown during process_event from PHActsVertexPropagator
error: No fitted track parameters for trajectory with entry index = 23
where the index is naturally  different.

Basically running tracking over 1M events whenever you want to try 
something is no problem.

Chris

--
*************************************************************

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

*************************************************************

Attachment: memory_fm_0_20.png
Description: PNG image

Attachment: time_fm_0_20.png
Description: PNG image