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Finding Number of Cores in Java

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

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javacoresfindingnumber

Problem

How can I find the number of cores available to my application from within Java code?

Call Runtime#availableProcessors.

int cores = Runtime.getRuntime().availableProcessors();

If cores is less than one, either your processor is about to die, or your JVM has a serious bug in it, or the universe is about to blow up.

int cores = Runtime.getRuntime().availableProcessors();

Stack Overflow Q#4759570, score: 911

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