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| Version 1.9 Build 803 |
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In cycle 1.5 the major piece of work has been the completion of the wide-field parallelization problem. The process of parallelization was slowed a bit with finding associated problems with the file locking mechanism. One of the major time consumers was that the user-locking mechanism was getting lost and i had to understand what was really happening. But the reasonable speed-ups that we have got show that the model of parallelization we chose is a practical one (at least on shared memory machines). The model we chose is to have the different workers CPU's access the same data sets independently instead of the master CPU passing the data around.
The sections that have been parallelized in the wide-field imaging process are:
PSF making
Visibility prediction
Residual image making
In the last few weeks of the cycle I have shifted into my new position and have been more involved in fixing bugs and user support. One of the major the satisfaction was the solving of the `position bug' that I found when I was checking the working of the wide-field imaging process long ago. On the science side I have been processing some P-band data and I think it should be reasonably easy (so I think right now!) to solve the VLA beam asymmetry.