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JRuby: Difference between revisions
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JRuby is an implementation of Ruby that runs inside the [[runs on vm::Java Virtual Machine]] and can call Java libraries from Ruby code. JRuby
JRuby has preemptive concurrency like Java; each Ruby Thread is a Java Thread. JRuby can run multiple threads in parallel on multiple CPUs, if the JVM can do so. [[MRI]] has a Global VM Lock and can run these threads on only one CPU. In contrast, JRuby can never fork processes; MRI can fork with some platforms.
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