Questions tagged [parallel-processing]

Use this tag when asking questions about multi or parallel processing - a programming paradigm used to speed up computationally intensive geoprocessing tasks by executing them over multiple CPU cores or threads.

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22
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Arcpy Parallel Processing Environment

I recently discovered the Parallel Processing environment setting in ArcGIS (this must be new to 10.1), however, there is no mention as to what tools are designed to utilize this environment setting. ...
20
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1answer
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ArcGIS 10.1 Python AddIn Using Multiprocessing crashes ArcMap?

I would like to run a multiprocessing task from a python add-in tool. My issue is that the process keeps failing. Basically crashes ArcMap. Here is my basic code: def function(startOID, endOID, fc)...
16
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3answers
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Porting Avenue code for Producing Building Shadows to ArcPy/Python for ArcGIS Desktop? [duplicate]

Whuber provided an answer at Producing building shadows using ArcGIS Desktop? which required using Avenue code. Any idea how to make it work in ArcGIS Desktop 10?
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3answers
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Parallelising GIS operations in PyQGIS?

A common requirement in GIS is to apply a processing tool to a number of files or apply a process for a number of features in one file to another file. Much of these operations are embarrassingly ...
13
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2answers
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Multiprocessing Errors - ArcGIS implementation

I was wondering if anyone else in the community here has attempted to use multi-processing for spatial analyses. Namely I am trying to iterate through a series of rasters, create a multiprocessing job ...
12
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2answers
3k views

Methods for optimizing multcore processing in ArcGIS

I am interested in learning methods to utilize the full extent of multicore processing power available on a desktop computer. Arc states that background geoprocessing allows the user to utilize ...
12
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1answer
2k views

OGR/GDAL threading results in low core utilization

I'm trying to process some raster data using ogr/gdal and I can't seem to get full utilization of all the cores on my machine. When I only run the process on a single core, I get 100% utilization of ...
11
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1answer
3k views

Does GDAL support parallel processing?

I would like to speed up the process corresponding to this command: gdalwarp -t_srs EPSG:4326 -overwrite input.ntf output.tif Is there a way to use parallel processing in GDAL? Semi-offtopic: If not,...
8
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5answers
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python.multiprocessing and “FATAL ERROR (INFADI) MISSING DIRECTORY”

While trying to do multiprocessing with arcpy, I am occasionally running into this error: FATAL ERROR (INFADI) MISSING DIRECTORY I have no clue what is triggering this error, and it crashes the ...
7
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2answers
2k views

How parallelize the extract function for raster files in R?

I´m trying to parallelize a simple "extract" operation like this: UseCores<-detectCores() -1 cl<- makeCluster(UseCores) registerDoParallel(cl) all.test.poly_period.test<-extract(stack.ts, ...
7
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1answer
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Can multiprocessing with arcpy be run in a script tool?

I have been tinkering around with the multiprocessing module to resolve some processing of data in ArcMap 10.3. I have created a script which works fine if I run it in IDLE. I see all my cores max ...
7
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1answer
253 views

Arcpy and multiprocessing not working

I want to utilize multiprocessing within my arcpy scripts but my first test has run into a problem which I don't understand. I'm running the script in the python window: import arcpy from ...
6
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1answer
1k views

How to do parallel queries in postgis [closed]

Is there any way to do queries in postgis using multiple cores in a transparent way, other than splitting my queries among several client connections ?
6
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3answers
406 views

How to run qgis scripts in parallel across remote server(s)

I have a stand alone python script using qgis that I wrote with the help of the SE question here The script takes three arguments being; an input file path, an output file path, and another input ...
6
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1answer
417 views

parallelization of raster mosaic

I would like to create a raster mosaic of the national USGS NED 30m DEM (~50 GB). I'd like to leverage parallel processing using python multiprocessing module where possible. I'm using ArcGIS 10.0. My ...
5
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1answer
926 views

How to implement multiprocessing with multiple geoprocesses?

I am relatively new to Python and thought I would give a stab at multiprocessing. I have a script that runs well in IDLE or as an ArcMap toolbox script. After perusing these forums and docs.python, I ...
5
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1answer
897 views

Multiprocessing in a QGIS Plugin

I have developed a QGIS plugin that processes an image using a bunch of other information, but it runs slowly. I would like to parallelize, as I can do with Multiprocessing.Process outside a QGIS ...
5
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0answers
884 views

Is it possible to do parallel processing in GDAL and QGIS?

It seems like processing a large raster dataset in QGIS can cause a crash, for example in QGIS failing to complete clip or intersect and crash dump in qgis. Is it possible to use GDAL parallel ...
4
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2answers
2k views

Processing multiple files simultanously using python

I have 11000 point shapefiles to run Near tool on against another point shapefile. I am looking for a way to process 10 files at the same time. Is there a way to process so many files using Python ...
4
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1answer
1k views

R - multicore approach to extract raster values using spatial points

It might look like this question is duplicated, but I'm asking about data extraction by points, rather than by polygons, and I couldn't find hints about point extraction. Therefore, please bare with ...
4
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2answers
2k views

How to achieve parallel Kriging in R to speed up the process?

I have tried the gstat package in R to perform bathymetry predictions based on Kriging interpolation methods. However, the process is very time consuming due the large amount of sampling data I'm ...
4
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1answer
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Can I increase the number of processes in ArcGis Server 10.1?

I use ArcMap 10.1. I have a map with many Mosaic and Raster layers. They are stored in many gdb-s. I publish this map with option "Create tiles on demand". But this tiles are created very slowly (may ...
4
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1answer
2k views

How to write to a single table via Python multiprocessing

A comment in the post Can multiprocessing with arcpy be run in a script tool? got me thinking, as I often need to do exactly this: Just beware of deadlocking situations (two Insert cursors in the ...
4
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1answer
311 views

Splitting data into geographic zones for multiprocessing

I have been looking at multiprocessing and tools like Find Duplicates in Big Data and they seem to simply split the data into sections based on rows/number of records. I am trying to do an intersect ...
4
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1answer
90 views

Parallelize Extracting Large Raster Values (one band) to Points

I have sf data with single point geometries (points) and a 23,000 x 18,000 elevation RasterLayer with a single band, loaded from a geotiff (elev). They have the same CRS. I want to extract the ...
4
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1answer
5k views

Python Postgres Multiprocessing speed increase

I'm trying to speed up my PostGIS queries using multiprocessing. My current setup is using python and psycopg2 such as below. Although this has given a speed increase, it still seems like there are ...
4
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0answers
302 views

How to use the multiprocessing module on python to execute a spatial join? [closed]

I have several shapefiles of the entire Amazon rainforest each with millions of polygons (they are fairly detailed and take some time to draw on ArcMap). I need each of these shapefiles to be ...
3
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2answers
696 views

Python and QGIS multiprocessing documentation?

Where can we find better documention for python QGIS multiprocessing. Especially regarding the multiprocessing of python and QGIS.
3
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2answers
4k views

Execute multiple process in parallel of Arcpy script

I have seen some difficult ways to do parallel processing, but I wonder if it is possible to simply execute multiple process of the same ArcPy script at the same time. My script makes some changes to ...
3
votes
1answer
3k views

Unable to do a parallel INSERT using Postgres 9.6.0 & PostGIS 2.3.0

The following PostGIS query executes in parallel using Postgres 9.6's new parallel processing feature: SELECT pnts.mb_code11, bdys.mb_code11 FROM testing.mb_random_points AS pnts INNER JOIN testing....
3
votes
1answer
197 views

Python rtree and parallelized code

I'm trying to parallelize with multiprocessing.Pool() some processes that involve queries of R-trees. In the non-parallel procedure, it works as expected. But when I try to do it in parallel (even ...
3
votes
1answer
800 views

arcpy with multiprocessing throws “UnpickleableError: Cannot pickle <type 'geoprocessing Layer object'> objects”

I'm attempting to speed up a process which is currently running synchronously, by using the python multiprocessing module. I'm having trouble sending a feature layer to a function which is called by ...
3
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1answer
718 views

How to use multiprocessing or pool to boost up the performance of ArcPy script

I created some arcpy script which actually runs slow on huge dataset. such as 100000 feature in it. I read from below path that multiprocessing can boost up arcpy script script performance. http://...
3
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1answer
1k views

Multiprocessing issues with ArcPy

I am using ArcGIS 'watershed' routine in a script which makes use of multiprocessing. This works fine, but during execution I get the message: Unable to remove directory. Possible causes: 1- Not ...
3
votes
0answers
266 views

Multiprocessing with geopandas

I am learning how to implement the multiprocessing with spatial data using the module multiprocessing. I am trying to implement a spatial intersection between a polygon file and a grid file. I am ...
3
votes
0answers
348 views

Multiprocessing in python qgis?

When i try to do mutliprocessing in python Qgis it doesn't work from multiprocessing import Process,Lock import multiprocessing def name1(l,i): print i if __name__=='__main__': lock=Lock() ...
3
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0answers
522 views

Using Multiprocessing inside a plugin in Qgis [closed]

I spent quite a bit of time looking on how to use the multiprocessing package, but couldn't find anything on how to use it inside a plugin in QGIS. I am developing a plugin that does some ...
3
votes
0answers
383 views

python.multiprocessing and “FATAL ERROR (INFADI) MISSING DIRECTORY” [closed]

I have a question which is closely related to this old question here: python.multiprocessing and "FATAL ERROR (INFADI) MISSING DIRECTORY" I have also looked at this, which seems to relate ...
2
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2answers
2k views

Full utilization of CPU-cores with gdalwarp

I need to process many large GeoTiff files with gdalwarp. For this I have used the following command: gdalwarp -r cubic -s_srs EPSG:25832 -t_srs EPSG:3857 -cutline shapefile.shp -crop_to_cutline -...
2
votes
1answer
361 views

Setting ArcPy environment variables with Python multiprocessing?

I have a script which uses ArcPy + Python multiprocessing. Are ArcPy environment variables shared between separate Python processes? If I write to arcpy.env.extent from within each process am I ...
2
votes
1answer
998 views

Multiprocessing error in QGIS with Python on Windows?

I have this error when I try to use Manager() from python multiprocessing library. (Just start QGIS open Python console and execute the two following lines) >>> import multiprocessing >&...
2
votes
1answer
338 views

problem deleting shapefiles because still in use by arcpy cursor [duplicate]

I have a function outputTblContents which contains def outputTblContents ( path ): rows = arcpy.SearchCursor(path, fields="alpha; beta") for row in rows: print("{0} => {1}").format(...
2
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1answer
85 views

How to use multiprocessing with Make Route Analysis Layer tool

I am using ArcGIS 10.4.1 and Network Analyst extension. As an IDE i use Spyder and Python version 2.7. I created a script where there is a method with the following arguments. def ra(EndPoint, ...
2
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1answer
156 views

Dividing a large raster into blocks for iteration in R

I have very big rasters for processing (#pixels >1,5*10^10) for this project I am working on. Simple functions such as finding the area of a pixels with a particular value, across the entire raster 1) ...
2
votes
1answer
367 views

Does anyone already parallelized mosaic function for rasters in R?

Does anyone already paralleled mosaic function for rasters in R? It seems that snow still doesn´t deal with this on an automatic way. The idea is something like this: r1<-stack("fit__test23KLR....
2
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1answer
217 views

PyWPS with python multiprocessing

I have a python script that runs a set of queries in parallel using multiprocessing.pool and map_async. The script from @Aaron works perfectly. Now I want to integrate the same functions into a ...
2
votes
1answer
435 views

Batch intersect and multiprocessing with arcpy

I admit what I am working on is way over my head, especially as I've only been dabbling in python for a few months. I am attempting to write a script that allows me to use Intersect analysis on about ...
2
votes
0answers
66 views

Parallel optimization for query over LiDAR dataset

I'm using PostGIS + pointcloud to store a huge dataset of LiDAR point (2M patches of 600points) I query this database to obtain the altimetic profile between two points. At the moment I have a huge ...
2
votes
1answer
516 views

Combining python (parallel) multiprocessing toolbox with arcpy

I'm trying to cut down on arcpy processing time by using the python multiprocessing toolbox. Using the example from http://wltrimbl.github.io/2014-06-10-spelman/intermediate/python/04-multiprocessing....
2
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0answers
1k views

How to make a Python Multiprocessing Script work on Windows OS [closed]

I use the Python multiprocessing module to speed up a function (get_craters_for_buffering_BCC) in my script. In this function, I want to identify points (passed as a list: crater_features_list) within ...