In this tutorial, we will show you how to use Neocortix Cloud Services Scalable Compute to run a distributed batch Python job, accessing information about the devices' approximate location.
First, please follow the steps in the tutorial Setting Up For Batch Jobs.
After completion of the initial setup, you will have a directory with examples,
~/ncsexamples
.
In the subdirectory 
It will command the instances to run the simple example Python code supplied in file
The output will be a simple text file
~/ncsexamples/batchMode
you will find the runBatchLocation.py command.
This script will create a set of instances running on mobile devices, one instance for each frame to
be computed (10 in the default example provided).
startFrame = 1,
endFrame = 10,
helloLocation.py
.
workerScriptPath = 'helloLocation.py'
def frameCmd( self, frameNum ):
pythonFileName = os.path.basename( self.workerScriptPath )
cmd = 'python3 %s %d | tee %s' % \
(pythonFileName, frameNum, self.frameOutFileName(frameNum) )
return cmd
frame_<n>.out
indicating the approximate location of the device, derived from its IP address.
These files will
be sent back to the master host, and the master will then terminate the instances.
Example Command
Simply run
When the program is done, the output files will be put in a directory
python3 ./runBatchLocation.py
./data/python_<datestamp>
Example Output
$ more frame_*.out
::::::::::::::
frame_1.out
::::::::::::::
Hello from "Chattanooga, TN, United States" (US.TN.Chattanooga)
{'latitude': 35.1587, 'longitude': -85.2163, 'display-name': 'Chattanooga, TN, U
nited States', 'country': 'United States', 'country-code': 'US', 'area': 'TN', '
locality': 'Chattanooga'}
::::::::::::::
frame_2.out
::::::::::::::
Hello from "Lompoc, CA, United States" (US.CA.Lompoc)
{'latitude': 34.6608, 'longitude': -120.4424, 'display-name': 'Lompoc, CA, Unite
d States', 'country': 'United States', 'country-code': 'US', 'area': 'CA', 'loca
lity': 'Lompoc'}
::::::::::::::
frame_3.out
::::::::::::::
Hello from "Gainesville, FL, United States" (US.FL.Gainesville)
{'latitude': 29.7005, 'longitude': -82.308, 'display-name': 'Gainesville, FL, Un
ited States', 'country': 'United States', 'country-code': 'US', 'area': 'FL', 'l
ocality': 'Gainesville'}