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java - Default for XX:MaxDirectMemorySize

in Technique[技术] by (71.8m points)

What is the default value for XX:MaxDirectMemorySize?

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From sun.misc.VM, it's Runtime.getRuntime.maxMemory(), that's what is configured with -Xmx. E. g. if you don't configure -XX:MaxDirectMemorySize and do configure -Xmx5g, the "default" MaxDirectMemorySize will also be 5 Gb, and the total heap+direct memory usage of the app may grow up to 5 + 5 = 10 Gb.


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