Dear Lorenzo, On 03/03/2016 12:13 PM, Lorenzo Bottaccioli wrote:
Yes I have 8 cores! The I/O output files are different for each process. I have to preform the gdal_calc on different maps each process. I just wanted to lunch more than one gdal_calc.py script at time.
Yes, I assumed the files used by each of your processes are different. This doesn't matter. They all have to be read and written by the one controller that provides access to the disk. It will serialize all access to the disk. You cannot read and/or write from/to multiple files that are located on the same disk in parallel.
You may have improved the performance of the computational part, but you also may have decreased the performance of the I/O part. The overall performance will depend on the balance between these two. In your case you may be better off optimizing for I/O. Instrumenting your code will provide you with clues about what is really going on.
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