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$KernelCount—Wolfram Documentation

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$KernelCount

gives the number of subkernels available for parallel computations.

Details

$KernelCount is equivalent to Length[Kernels[]].
When evaluated in a subkernel of a particular master kernel, $KernelCount gives the number of subkernels available to the master kernel.

Examplesopen all close all Applications (1)

Run a search for a random prime on each parallel kernel:

Properties & Relations (1) Possible Issues (2)

Evaluating $KernelCount in a new session does not cause any kernels to be launched:

By default, doing a parallel computation will launch the default set of kernels:

Wolfram Research (2008), $KernelCount, Wolfram Language function, https://reference.wolfram.com/language/ref/$KernelCount.html. Text Wolfram Research (2008), $KernelCount, Wolfram Language function, https://reference.wolfram.com/language/ref/$KernelCount.html.CMS Wolfram Language. 2008. "$KernelCount." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$KernelCount.html.APA Wolfram Language. (2008). $KernelCount. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$KernelCount.htmlBibTeX @misc{reference.wolfram_2025_$kernelcount, author="Wolfram Research", title="{$KernelCount}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/$KernelCount.html}", note=[Accessed: 17-August-2025]}BibLaTeX @online{reference.wolfram_2025_$kernelcount, organization={Wolfram Research}, title={$KernelCount}, year={2008}, url={https://reference.wolfram.com/language/ref/$KernelCount.html}, note=[Accessed: 17-August-2025]}

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