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[HTCondor-users] condor_submit_dag independent child processes

Dear HT-condor Users,
I am trying to optimally paralelize our data processing pipeline via condor and I have found one issue which I am not able to solve...

In my file.dag, I have 6 different processes and following PARRENT and CHILD edges:

JOB data_convert /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-data_convert.condor JOB dmri_preproc /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-dmri_preproc.condor
JOB mprage_bet /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-mprage_bet.condor
JOB mprage_seg /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-mprage_seg.condor
JOB mprage2diff /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-mprage2diff.condor
JOB mprage2mni /md1/NH-DHP/NH-DHP-002/condor_logs/NH-DHP-002-mprage2mni.condor
PARENT data_convert CHILD dmri_preproc mprage_bet
PARENT mprage_bet CHILD mprage_seg mprage2mni
PARENT dmri_preproc mprage_seg CHILD mprage2diff

After data_convert, both CHILD precosses (dmri_preproc and mprage_bet) start. Process dmri_preproc takes much more time than other processes. Process mprage_bet is finished much earlier. When mprage_bet is finnished, the process mprage2mni is started first and mprage_seg is started after mprage2nii is finished and not imediatelly when mprage_bet is finished.

and i have enough free threads in my pool to be able to compute all three processes at once.

Does somebody have an idea why it behaves in that way. mprage_seg and mprage2mni should be independent on themselves.

Yours faithfully,
Rene Labounek