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Last change
on this file since 7177 was
5779,
checked in by steve, 17 years ago
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Added the old version of pypar which works with Numeric. Necessary for parallel code until we move anuga to numpy (and then we can use pypar as distribute via sourceforge).
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File size:
1.4 KB
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| [5779] | 1 | Dear Ole Nielsen, |
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| 2 | |
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| 3 | I saw your announcement of Pypar on comp.lang.python.announce. In our |
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| 4 | programs, we are using Konrad Hinsen's Scientific Python module. I |
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| 5 | have a small technical question. You write that one advantage of your |
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| 6 | approach is, that one does not need a special version of the Python |
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| 7 | executable, just the pypar module. In Scientific Python it is |
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| 8 | necessary to modify Python because MPI requires that MPI_Init is |
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| 9 | called before the program looks at its command line arguments, and |
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| 10 | Python needs to look at its command line arguments to figure out which |
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| 11 | script to run. How do you bypass this problem? I know there are MPI |
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| 12 | implementations where this is not a problem as MPI only adds extra |
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| 13 | stuff to the command-line on the non-master nodes, but there are some |
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| 14 | implementation (MPICH, for example) where the whole command line is |
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| 15 | replaced with MPI stuff and the command line is only restored when |
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| 16 | MPI_Init is called. |
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| 17 | |
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| 18 | I am very interested to hear if you have found an elegant way to solve |
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| 19 | this, as it is slightly annoying to have to have an extra version of |
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| 20 | the Python executable. |
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| 21 | |
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| 22 | |
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| 23 | Best regards |
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| 24 | |
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| 25 | Jakob Schiotz |
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| 26 | |
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| 27 | |
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| 28 | -- |
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| 29 | Jakob Schiotz, Ph.D. ! Email: schiotz@fysik.dtu.dk |
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| 30 | CAMP, Department of Physics ! WWW: http://www.fysik.dtu.dk/~schiotz/ |
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| 31 | Technical University of Denmark ! Phone: (+45) 45 25 32 28 |
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| 32 | DK-2800 Lyngby, Denmark ! Fax: (+45) 45 93 23 99 |
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| 33 | |
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