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From: MAGUIRC@ctrvax.vanderbilt.edu
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Subject: Event reconstruction CPU execution times for PHENIX central arms
March 19, 1995
Dear PHENIX software colleagues,
Below an updated table of current CPU execution times for single HIJET
density event reconstruction in the central PHENIX arms. The table now
includes my RS6000 340D and Soren Sorensen's SGI 4400SC at ORNL. A CPU timer
was put inside of PISORP for more accurate times, and no NTUPLE store options
were invoked. The times below are based on 10 events and include pole tip
background flux.
Event Reconstruction CPU Times/Event (Seconds in PISORP)
PISORP Platform
Data Structures RS6000 SGI 4400SC (DC/PC tracking mode)
DC/PC1 7.6 3.6 ("known track mode")
DC/PC1 33.6 12.3 ("unknown track mode")
DC/PC1/RICH 8.1 4.7 ("known track mode")
DC/PC1/RICH/PC2/PC3 12.1 6.3 "" "" ""
DC/PC1/RICH/PC2/TEC/PC3 169.7 49.7 "" "" ""
A triplet of comments:
1) The SGI 4400SC has a dual cache system, and this apparently works
to its advantage in the TEC reconstruction compared to the simple
single cache IBM system;
2) The pattern recognition here is based on a DC1/DC2 8 stereo wire
implementation leading to what has been called the "stepping-stone"
approach to the full track reconstruction. This method will not
work with a DC2 only stereo system, so the above times are not
guaranteed in that case;
3) There may be as much as a factor of two fat in the DC/PC1 CPU times
for the "unknown" track mode, but that is not worth pursuing at the
moment.
Note that the EMCal is not yet in this event reconstruction, but Gabor
David has done an extensive set of in-PISA cluster reconstructions. So we
should already have a good handle on this last major time component of the
central arm event reconstruction.
Best regards,
Charlie Maguire
PS to Nikolai: Could you forward to me the event reconstruction times in
single HIJET density from your stand-alone program, broken out in the same
detail as the table above and specifying the platform? Thanks.
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