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| 2 | Hej Jakob |
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| 3 | |
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| 4 | (I assume you understand danish) |
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| 5 | |
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| 6 | > I saw your announcement of Pypar on comp.lang.python.announce. In our |
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| 7 | > programs, we are using Konrad Hinsen's Scientific Python module. I |
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| 8 | > have a small technical question. You write that one advantage of your |
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| 9 | > approach is, that one does not need a special version of the Python |
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| 10 | > executable, just the pypar module. In Scientific Python it is |
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| 11 | > necessary to modify Python because MPI requires that MPI_Init is |
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| 12 | > called before the program looks at its command line arguments, and |
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| 13 | > Python needs to look at its command line arguments to figure out which |
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| 14 | > script to run. |
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| 15 | |
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| 16 | Jeg har aldrig rigtigt forstaaet hvorfor det skulle vaere noedvendigt. |
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| 17 | Derfor gik jeg igang med at implementere et interface hvor |
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| 18 | Python oversetteren forbliver uaendret. |
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| 19 | MPI_init har selvfoelgelig ikke adgang til commandline parametre |
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| 20 | - saa det er prisen for min tilgang. |
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| 21 | |
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| 22 | > How do you bypass this problem? I know there are MPI |
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| 23 | > implementations where this is not a problem as MPI only adds extra |
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| 24 | > stuff to the command-line on the non-master nodes, but there are some |
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| 25 | > implementation (MPICH, for example) where the whole command line is |
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| 26 | > replaced with MPI stuff and the command line is only restored when |
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| 27 | > MPI_Init is called. |
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| 28 | |
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| 29 | Det er muligt at pypar vil have problemer med det. |
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| 30 | Jeg har imidlertid testet pypar under LAM/Mpi (linux), |
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| 31 | Native MPI for DEC Alpha og MPICH for Sun enterprise. |
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| 32 | Jeg kunne ikke umiddelbart faa ideen til at virke under MPICH/Linux - maaske |
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| 33 | pga det problem du beskriver. |
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| 34 | |
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| 35 | > I am very interested to hear if you have found an elegant way to solve |
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| 36 | > this, |
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| 37 | |
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| 38 | Jeg har ikke fundet en elegant loesning - maaske snarere en vej udenom: |
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| 39 | Problemet er rent teoretisk for de implementationer jeg bruger |
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| 40 | og kan ignoreres. |
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| 41 | |
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| 42 | |
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| 43 | > as it is slightly annoying to have to have an extra version of |
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| 44 | > the Python executable. |
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| 45 | |
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| 46 | Ja - det var det jeg taenkte. |
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| 47 | |
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| 48 | Hvis du har lyst kan du hjaelpe med at udvikle pypar ideen ? |
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| 49 | |
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| 50 | Mvh |
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| 51 | Ole |
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| 52 | |
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| 53 | ------------------------------------------------------------------- |
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| 54 | Ole Nielsen | Email: Ole.Nielsen@anu.edu.au |
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| 55 | ------------------------------------------------------------------- |
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| 56 | School of Mathematical Sciences| Phone: +61 2 6125 3873 (Direct) |
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| 57 | Australian National University | Fax: +61 2 6125 5549 |
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| 58 | Canberra ACT 0200 | |
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| 59 | Australia | |
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| 60 | ------------------------------------------------------------------- |
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| 61 | |
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