ParallelArray
ParallelArray[f,n]
generates in parallel a list of length n, with elements f[i], evaluated.
ParallelArray[f,{n1,n2,…}]
generates in parallel an 
array of nested lists, with elements f[i1,i2,…].
ParallelArray[f,{n1,n2,…},{r1,r2,…}]
generates in parallel a list using the index origins ri (default 1).
ParallelArray[f,dims,origin,h]
uses head h, rather than List, for each level of the array.
Details and Options
- ParallelArray is a parallel version of Array, which automatically distributes different evaluations of expr among different kernels and processors.
- ParallelArray will give the same results as Array, except for side effects during the computation.
- Parallelize[Array[f,n]] is equivalent to ParallelArray[f,n].
- If an instance of ParallelArray cannot be parallelized it is evaluated using Array.
- ParallelArray takes the same DistributedContexts option as ParallelTable.
Examples
open allclose allBasic Examples (3)
ParallelArray works like Array, but in parallel:
Options (11)
Method (6)
Break the computation into the smallest possible subunits:
Break the computation into as many pieces as there are available kernels:
Break the computation into at most 2 evaluations per kernel for the entire job:
Break the computation into evaluations of at most 5 elements each:
The default option setting balances evaluation size and number of evaluations:
Calculations with vastly differing runtimes should be parallelized as finely as possible:
A large number of simple calculations should be distributed into as few batches as possible:
DistributedContexts (5)
By default, definitions in the current context are distributed automatically:
Do not distribute any definitions of functions:
Distribute definitions for all symbols in all contexts appearing in a parallel computation:
Distribute only definitions in the given contexts:
Restore the value of the DistributedContexts option to its default:
Possible Issues (2)
A function used that is not known on the parallel kernels may lead to sequential evaluation:
Define the function on all parallel kernels:
The function is now evaluated on the parallel kernels:
Definitions of functions in the current context are distributed automatically:
Definitions from contexts other than the default context are not distributed automatically:
Use DistributeDefinitions to distribute such definitions:
Alternatively, set the DistributedContexts option to include all contexts:
Text
Wolfram Research (2008), ParallelArray, Wolfram Language function, https://reference.wolfram.com/language/ref/ParallelArray.html (updated 2010).
BibTeX
BibLaTeX
CMS
Wolfram Language. 2008. "ParallelArray." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2010. https://reference.wolfram.com/language/ref/ParallelArray.html.
APA
Wolfram Language. (2008). ParallelArray. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ParallelArray.html