To generate Monte-Carlo events and reconstruct these events to produce data in the ESD format you need to prepare a few files:
- Config. C: this is a root macro where you select the transport model and the associated parameters, the event generator and the associated parameters and the active detectors and their geometries. Several examples can be found in $ALICE_ROOT/macros.
- sim.C and rec.C : these two root macros wrap the AliSimulation and AliReconstruction classes. They are the steering macros which are called from the aliroot prompt and launch either the simulation or the reconstruction process.
- sim.C
void sim() {
AliSimulation simu;
TStopwatch timer;
timer.Start();
simu.Run();
timer.Stop();
timer.Print();
}
-
- rec.C
void rec() {
AliReconstruction reco;
TStopwatch timer;
timer.Start();
reco.Run();
timer.Stop();
timer.Print();
}
- simRun.C: this is the root macro that launches all the tasks to be performed by every job. An example is given next:
// #define VERBOSEARGS // simrun.C { // extract the run and event variables given with --run <x> --event <y> int nrun = 0; int nevent = 0; int seed = 0; char sseed[1024]; char srun[1024]; char sevent[1024]; sprintf(srun,""); sprintf(sevent,""); for (int i=0; i< gApplication->Argc();i++){ #ifdef VERBOSEARGS printf("Arg %d: %s\n",i,gApplication->Argv(i)); #endif if (!(strcmp(gApplication->Argv(i),"--run"))) nrun = atoi(gApplication->Argv(i+1)); sprintf(srun,"%d",nrun); if (!(strcmp(gApplication->Argv(i),"--event"))) nevent = atoi(gApplication->Argv(i+1)); sprintf(sevent,"%d",nevent); } seed = nrun * 100000 + nevent; sprintf(sseed,"%d",seed); if (seed==0) { fprintf(stderr,"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"); fprintf(stderr,"!!!! WARNING! Seeding variable for MC is 0 !!!!\n"); fprintf(stderr,"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"); } else { fprintf(stdout,"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"); fprintf(stdout,"!!! MC Seed is %d \n",seed); fprintf(stdout,"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"); } // set the seed environment variable gSystem->Setenv("CONFIG_SEED",sseed); gSystem->Setenv("DC_RUN",srun); gSystem->Setenv("DC_EVENT",sevent); gSystem->Exec("cp $ROOTSYS/etc/system.rootrc .rootrc"); gSystem->Exec("aliroot -b -q sim.C > sim.log 2>&1"); gSystem->Exec("aliroot -b -q rec.C > rec.log 2>&1"); }
- xxx.jdl: this is the job description language (jdl) file where directives are given for the job execution, such as the software versions, where in the AliEn catalog to find the input files (those listed previously), where to put the results, the requirements for the resource broker, the number of events to process,� An example is given below:
Executable = "aliroot";
Jobtag={"comment:PDC05 flow events�, "round::2005�, "tag:v4-03-04", "type:Flow"};
Packages={"AliRoot::v4-03-04�, "GEANT3::v1-3"};
TTL = "86400";
Validationcommand ="/alice/cern.ch/user/a/aliprod/production_2005/flow/configs/validation.sh";
Requirements = ( other.CE == "Alice::LCG::Catania" );
InputFile= {"LF:/alice/cern.ch/user/a/aliprod/pdc05_flow/production/configs/Config.C",
"LF:/alice/cern.ch/user/a/aliprod/pdc05_flow/production/configs/simrun.C",
�LF:/alice/cern.ch/user/a/aliprod/pdc05_flow/production/configs/sim.C",
"LF:/alice/cern.ch/user/a/aliprod/pdc05_flow/production/configs/rec.C",
"LF:/alice/cern.ch/user/a/aliprod/pdc05_flow/production/configs/CheckESD.C"};
OutputArchive={"root_archive:*.root@Alice::CERN::Castor2", "log_archive:*.log,stdout,stderr@Alice::CERN::se01"};
OutputDir="/alice/cern.ch/user/a/aliprod/production_2005/flow/output_allfiles/$1/#alien_counter_03i#";
splitarguments="simrun.C --run $1 --event #alien_counter#";
split="production:1-50";
Workdirectorysize={"1500MB"};Once your files are ready and tested on one event, you have to add all the previously listed files in the AliEn catalogue in a directory of your choice.
> alien Nov 22 11:29:18 info Warning: cannot create envelope sealing engine = setting backdoor [aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/ > cd analysis/test/ [aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/analysis/test/ > add test.jdl file test.jdl Alice::Cern::Castor Nov 22 11:31:38 info access: warning - we are using the backdoor .... Nov 22 11:31:38 info Registering the file file://ccali.in2p3.fr/afs/in2p3.fr/group/alice/schutz/alien/test.jdl in Alice::CCIN2P3::cclcgalice Nov 22 11:31:38 info Initializing Service Nov 22 11:31:38 ApMon[INFO]: Added destination 193.48.99.73:8884: with default options. Nov 22 11:31:38 info Contacting SE SE_Alice::CCIN2P3::cclcgalice, and tell it to pick up file://ccali.in2p3.fr/afs/in2p3.fr/group/alice/schutz/alien/test.jdl Nov 22 11:31:38 info Copying a file into an SE Nov 22 11:31:42 info Getting the file file://cclcgalice.in2p3.fr/sps/alice/01/13077/2bd8a68a-5b43-11da-9dd6-00096b58e933.1132655501 of size 1161 Nov 22 11:31:42 info File /alice/cern.ch/user/s/schutz/analysis/test/test.jdl inserted in the catalog [aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/analysis/test/ > ls test.jdl
You are now all set to submit the production.
ccali28:~> alien login
Nov 17 14:43:01 info Error contacting the local SE
Nov 17 14:43:01 info Warning: cannot create envelope sealing engine = setting backdoor
Nov 17 14:43:01 notice Starting remotequeue...
Nov 17 14:43:01 info
[
Requirements = ( other.Type == "Job" );
CloseSE =
{
"Alice::CCIN2P3::cclcgalice"
};
CE = "Alice::CCIN2P3::BQS";
Host = "cclcgalice.in2p3.fr";
LocalDiskSpace = 9000000;
WNHost = "ccali28.in2p3.fr";
Memory = 2054924;
TTL = 112800;
Type = "machine";
Uname = "2.4.21-32.0.1.ELsmp";
FreeMemory = 68024;
Swap = 4192912;
GridPartitions =
{
"SC05"
};
FreeSwap = 3769436
]
[aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/ > submit /alice/cern.ch/user/s/schutz/analysis/test/test.jdl 99
Nov 22 11:41:36 info Submitting job '/alice/bin/aliroot '...
Nov 22 11:41:37 info Checking if the packages GEANT3::v1-3 AliRoot::v4-03-04 are defined in the system
Nov 22 11:42:03 info The PackMan has the following packages:
admin@AliRoot::v4-03-05
admin@GEANT::v1-1
aliprod@ROOT::4.03.02
VO@AliRoot::4.02.07
VO@AliRoot::v4-02-Rev-01
VO@AliRoot::v4-03-03
VO@AliRoot::v4-03-04
VO@GEANT3::2.1
VO@GEANT3::v1-1
VO@GEANT3::v1-3
VO@ROOT::4.03.02
VO@ROOT::v4-04-02
VO@ROOT::v5-02-00
Nov 22 11:42:03 info Job is going to be splitted for production, running from 1 to 5
Nov 22 11:42:03 info Input Box: {CheckESD.C Config.C rec.C sim.C simrun.C}
Nov 22 11:42:04 info Command submitted (job 57943)!!
[aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/analysis/test/ >Remember the job id. It is mandatory to follow the execution of your production. This is also the id you have to provide to the expert in the unlikely case where something is going wrong.
[aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/ > ps �rs �id 57943 schutz 57943 RS /alice/bin/aliroot schutz -57944 ST /alice/bin/aliroot schutz -57945 ST 00 /alice/bin/aliroot schutz -57946 ST 00 /alice/bin/aliroot schutz -57947 ST 00 /alice/bin/aliroot schutz -57948 ST 00 /alice/bin/aliroot aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/ > ps �WAs �id 57943 57943 -production:1-5-subjobs-- /alice/bin/aliroot RS 0 :0 :0 .0 -57944 Alice::Prague::PBS goliasx85.farm.particle.cz goliasx31.farm.particle.cz /alice/bin/aliroot ST 0 :0 :4 .30 -57945 Alice::Prague::PBS goliasx85.farm.particle.cz goliasx31.farm.particle.cz /alice/bin/aliroot ST 0 :0 :4 .33 -57946 Alice::LCG::Torino egee-wn122.torinoegee alibox.to.infn.it /alice/bin/aliroot ST 0 :0 :0 .43 -57947 Alice::LCG::Torino egee-wn110.torinoegee alibox.to.infn.it /alice/bin/aliroot ST 0 :0 :0 .44 -57948 Alice::LCG::Torino egee-wn122.torinoegee alibox.to.infn.it /alice/bin/aliroot ST 0 :0 :0 .33
If for any reasons an entire job or one or more subjobs failed you can resubmit it and only the failed jobs will be reprocessed:
[aliendb5.cern.ch:3307] /alice/cern.ch/user/s/schutz/ > masterJob 57943 resubmit
The command masterJob has several more functionalities: provide information on all subjobs, kill jobs, merge,� (see man masterJob)
