multiprocessing Attribute Error

JohanL

Has anyone tried to implement multiprocessing into their scripts? I've attempted to use the suggestion from http://blogs.esri.com/Dev/blogs/geoprocessing/archive/2011/08/29/Multiprocessing.aspx with raster processes but with no success i.e.

import os, multiprocessing, arcpy 

def project(raster):
        arcpy.ProjectRaster_management(raster...) 

def main():
        workspace = r'c:\somepath'
        arcpy.env.workspace = workspace
        fcs = arcpy.ListRasters('*')
        fc_list = [os.path.join(workspace, fc) for fc in fcs]
        pool = multiprocessing.Pool()
        pool.map(project, fc_list)
        pool.close()
        pool.join()

if __name__ == '__main__':    
        main()

However in the command line this gives me the error

File "C:\Python26\ArcGIS10.0\lib\multiprocessing\process.py", line 232, in _bootstrap
     self.run()
File "C:\Python26\ArcGIS10.0\lib\multiprocessing\process.py", line 88, in run
     self._target(*self._args, **self._kwargs)
File "C:\Python26\ArcGIS10.0\lib\multiprocessing\pool.py", line 57, in worker
     task = get() File "C:\Python26\ArcGIS10.0\lib\multiprocessing\queues.py", line 352, in get return recv()
AttributeError: 'module' object has no attribute'project'

I've been trying to work around the problem with parallel python without success and I cannot figure out how my code differs from the original.

Bjebn

JasonTaylor

I'm not sure about your particular issue, but I did have the same combo of error messages 101302 and 10067. It seemed to me like Arc was having permission issues and I looked to see what permissions were set to the folder I was outputting to. Although I have most permissions on my machine, the folder was listed by both windows explorer and arc catalog as being read-only in the folder properties. This was demonstrated by a greyed out check mark. Greyed out usually means I can't access the change, however I was able to uncheck the read-only box. My raster tools are now able to output to that directory. I was getting the errors while try to recondition a DEM using ArcHydro.

It makes no sense to me why this was set up as read only, or why the read-only box was greyed out, but this seems to have solved my problem. As another note, the box seems to be re checking itself after some activity. I need to go in periodically and un-check the box if I want to run raster tools in ArcHydro.