(r5) AlpgenTimeAndSizeStudies < Main

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---+!!Alpgen Time and Size Studies

---++ Goal
To measure the time and size performance of ALPGEN runs (grid production, event production) in a typical CMS T2 farm, like SPRACE.

---++ Modus Operandi
%RED% *IMPORTANT NOTE:* %ENDCOLOR% do everything in a subdirectory of /hdacs, so that you have more working space and the WNs can see that space.

   1. Setup a CMSSW area: =cmsrel CMSSW_2_2_9; cd CMSSW_2_2_9/src; cmsenv=
   1. Use whatever method to be able to CVS code from CERN.
   1. Get the ALPGEN grids: =cvs co -r CMSSW_2_2_9 !GeneratorInterface/AlpgenInterface=
   1. Setup CONDOR: =. /OSG/setup.sh=
   1. Use the script to submit ALPGEN jobs to SPRACE

The script takes three arguments: the config file for ALPGEN, the name of the ALPGEN executable you want to run, and the name of the grid. *It is the user's task to make sure all of those are coherent among themselves!* For instance, if you want to run ttbar+4 jets, at 40 !GeV threshold, starting from an already existing grid, you should use
<verbatim>
python sprace_ALPGEN_submit.py input /OSG_app/app/cmssoft/cms/slc4_ia32_gcc345/external/alpgen/213-cms2/bin/2Qgen GeneratorInterface/AlpgenInterface/data/ttbar4j_40GeV.grid2
</verbatim>

where input is of the form
<verbatim>
1          ! generation mode
ttbar4j_40 ! string labeling the output files
0          ! start with: 0=new grid, 1=previous warmup grid, 2=previous generation grid
0 0        ! N(events)/iteration and N(iter's) for initial grid optimiz. Use 0 0 if starting from existing grid
50000000   ! number evts to generate
*** The above 5 lines provide mandatory inputs for all processes
*** (Comment lines are introduced by the three asteriscs)
*** The lines below modify existing defaults for the hard process under study
*** For a complete list of accessible parameters and their values,
*** input 'print 1' (to display on the screen) or 'print 2' to write to file
njets 4
ebeam 5000
ih2 1
ickkw 1
ptjmin 40
etajmax 5
drjmin 0.7
mt 175
ihvy 6
itdecmode 7
</verbatim>

---++ Tasks
   * Check running times and event sizes for ttbar+1,3,5 jets at 40 !GeV threshold, starting from already-existing grids.
   * (more to be added later).

---++ Tools

   * Script to submit jobs to condor in SPRACE: [[%ATTACHURL%/sprace_ALPGEN_submit.py.txt][sprace_ALPGEN_submit.py.txt]]

   * Standard location of ALPGEN executables (from CMSSW): =$CMS_PATH/slc4_ia32_gcc345/external/alpgen=

(there are many subdirectories with different versions, pick the latest one).
---++ Some Results
For reference, these jobs were processed in [[http://www.sprace.org.br/Twiki/bin/view/Main/PhaseIII][hardware configuration]], using condor 7.0.3 as batch scheduler and Scientific Linux 4.6 

|*events*| *average time  (s)*| *standard deviation*|*size(b)*|
|1000  |0.000|0.000|1653|
|2000 |0.000|0.000|3021|
|5000 |0.000 |0.000|5757|
|10000|0.667| 0.943|6099|
|20000|6.667|1.247|7125|
|50000|20.667|2.494|9975|
|100000|43.667|2.055|15333|
|200000|96.333|3.399| 21090|
|500000|248.667|2.867|29412|
|1000000|498.667|3.301|36765|
|2000000|1013.667|1.687|47652|
|5000000|2562.000|33.978|69711|
|10000000|5095.750|37.456|90288|
|20000000|10149.250|56.167|121866|
|50000000|25425.750|192.689|195567|

<img src="%ATTACHURLPATH%/SPRACE_ALPGEN_ttbar1j40GeV.png" alt="SPRACE_ALPGEN_ttbar1j40GeV.png" width='689' height='467' />

-- Main.ThiagoTomei - 19 May 2009

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
png	SPRACE_ALPGEN_ttbar1j40GeV.png	r1	manage	10.8 K	2009-05-19 - 13:12	ThiagoTomei
EXT	alpgen_sub	r1	manage	2.0 K	2009-05-14 - 12:58	UnknownUser	shell script with some steps from this tutorial
txt	sprace_ALPGEN_submit.py.txt	r1	manage	2.8 K	2009-05-14 - 09:38	ThiagoTomei

Topic revision: r5 - 2009-05-19 - ThiagoTomei

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