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ParallelNeeds["context`"]

evaluates Needs["context`"] on all available parallel kernels.

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ParallelNeeds

ParallelNeeds["context`"]

evaluates Needs["context`"] on all available parallel kernels.

Details

Examples

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Basic Examples  (1)

Load package for master kernel:

Wolfram Language code: Needs["ComputerArithmetic`"]

Load package for parallel kernels:

Wolfram Language code: ParallelNeeds["ComputerArithmetic`"]

Properties & Relations  (2)

ParallelNeeds uses ParallelEvaluate to run Needs on all parallel kernels:

Wolfram Language code: ParallelNeeds["ComputerArithmetic`"]

An explicit ParallelEvaluate does the same:

Wolfram Language code: ParallelEvaluate[Needs["JLink`"]]
Wolfram Language code: ParallelEvaluate[$ContextPath, First[Kernels[]]]

Only the effect of ParallelNeeds is remembered for new kernels:

Wolfram Language code: CloseKernels[];LaunchKernels[]
Wolfram Language code: ParallelEvaluate[$ContextPath, First[Kernels[]]]

Use ParallelNeeds to set up a package on all parallel kernels:

Wolfram Language code: Needs["GraphUtilities`"] ParallelNeeds["GraphUtilities`"]
Wolfram Language code: ParallelEvaluate[HamiltonianCycles[CompleteGraph[3], All]]

Use DistributeDefinitions to set up your own definitions:

Wolfram Language code: hcg[n_] := HamiltonianCycles[CompleteGraph[n], All]
Wolfram Language code: DistributeDefinitions[hcg];
Wolfram Language code: ParallelMap[hcg, Range[4]]

Possible Issues  (1)

It is generally necessary to load any package also on the master kernel:

Wolfram Language code: Needs["ComputerArithmetic`"] ParallelNeeds["ComputerArithmetic`"]

Symbols can now be used on the master and parallel kernels:

Wolfram Language code: ParallelMap[Ulp, 10.0 ^ Range[10]]
Wolfram Research (2008), ParallelNeeds, Wolfram Language function, https://reference.wolfram.com/language/ref/ParallelNeeds.html.

Text

Wolfram Research (2008), ParallelNeeds, Wolfram Language function, https://reference.wolfram.com/language/ref/ParallelNeeds.html.

CMS

Wolfram Language. 2008. "ParallelNeeds." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ParallelNeeds.html.

APA

Wolfram Language. (2008). ParallelNeeds. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ParallelNeeds.html

BibTeX

@misc{reference.wolfram_2026_parallelneeds, author="Wolfram Research", title="{ParallelNeeds}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/ParallelNeeds.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_parallelneeds, organization={Wolfram Research}, title={ParallelNeeds}, year={2008}, url={https://reference.wolfram.com/language/ref/ParallelNeeds.html}, note=[Accessed: 12-June-2026]}