I am currently working on an HPC-Cluster with 16 available threads. So I put the command export OMP_NUM_THREADS=16 at the top of my bash script, hoping that the number of threads is set for all following GAMMA-functions that use OPENMP. Unfortunately this is not working (e.g. with running offset_pwr), as still the default number of 4 threads is used. Does anybody have any suggestions?
Dear Peter,
I would suggest you to make direct contact with GAMMA Remote sensing that is the best way, because as you know that this software is commercial and not publicly available. From the other side personaly I could check it and comeback to you leater.
Dear Falah,
Thank you for your quick answer. Multithreading is working now. After contacting GAMMA we got to know that multithreading with more than 4 threads is not available anymore for algorithms where a higher number of threads gives no significant improvement of performance. As offset_pwr is such an algorithm and we tested multithreading mostly with this function, we (wrongly) assumed that multithreading is not working in general in our case.
Short update on multithreading for GAMMA`s offset_pwr, offset_pwr_tracking, offset_pwr_trackingm and offset_pwrm functions: New versions (May 2015) of these programs are available which now allow multithreading. As some of you probably observed, the older functions in the version of Dec. 2014 do not allow multithreading and additionally have severe problems with tracking accuracy. The latter is obviously caused by wrong SNR estimations made by the programs. If you need the new versions of these algorithms, you can write to GAMMA and they will send them to you via Email.
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