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Elisabetta Ladu <elisabetta.ladu@inaf.it> </td>
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Awaiting Agent
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Dear AIPS support staff, My name is Elisabetta Ladu, and I am a Ph.D. student at the INAF – Osservatorio Astronomico di Cagliari in Italy. I am writing this mail because I have encounte...
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<div>Dear AIPS support staff,</div><div>My name is Elisabetta Ladu, and I am a Ph.D. student at the INAF – Osservatorio Astronomico di Cagliari in Italy.</div><div>I am writing this mail because I have encountered some problems during the reduction of a HSA (VLA+ VLBA) dataset of mine recently correlated and delivered.</div><div>Indeed, my intention was that of performing a ‘quick and dirty’ data reduction and, therefore, after loading the dataset in AIPS, and briefly inspecting the visibilities, I created a BP table (task BPASS) by including all the fringe finders (but not the phase reference). </div><div>Afterwards, I run the task ‘FRING’ (with SOLINT=5) but I was warned with some error messages, that I report in the following:</div><div>LOCALH> FRING1: ZMEMRY: MEMORY ALLOCATION FAILS AT FRNSOL</div><div>LOCALH> FRING1: FRNSOL: UNABLE TO GET NEEDED MEMORY, reduce SOLINT</div><div>LOCALH> FRING1: OR USE A BIGGER OR LESS BUSY COMPUTER</div><div>LOCALH> FRING1: ENTRY NOT FOUND AT FRNSOL</div><div>LOCALH> FRING1: Purports to die of UNNATURAL causes</div><div>LOCALH> FRING1: localhos 31DEC20 TST: Cpu= 81.5 Real= 82 IO= 17396</div><div>and the task aborted.</div><div>The problem and errors persisted independently from the CALSOUR used.</div><div>Indeed, as suggested in the error message, reducing the SOLINT allowed the task to work fine until the end.</div><div>However, I was still wondering why the SOLINT=5 (quite standard in this kind of data reduction) was causing problems to FRING on a computer like mine that it is considered quite performing (see attached computer characteristics).</div><div>Therefore, I have set the verb 'SETMAXAP' to the maximum allowed value but without obtaining any positive outcome.</div><div>Please, let me know if you have any clue on how to solve the problem.</div><div>In addition, in order to bypass the reported problem a colleague of mine suggested the use of 'parallelism' in AIPS but this seems not possible (see message below) in my actual version of AIPS 31Dec20: </div><div>AIPS 1: PARALLELISM NOT SUPPORTED IN THIS INSTALLATION</div><div>AIPS 1: Subsequent parallel tasks will use 1 threads.</div><div>Could this be associated again with my computer performances or AIPS version?</div><div>Thank you so much in advance for your help and suggestions.</div><div>Regards,</div><div> </div><div>Elisabetta</div>
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