JVM Xmx argument only works with Xms, maybe even not work properly

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I encountered a OutOfMemoryError: java heap space when trying to create a long byte array(139708800 bytes, meaning 134M).

1. In order to solve this problem, I change the -Xmx argument of the JVM from default value(256M) to 1G. However, the OutOfMemoryError still remains. (I tried many times, sometimes error, sometimes no problem)


2. Then I change the -Xms argument of the JVM from 16M to 256M, the error disappears. (I am not sure if the problem will never appear with this setting)

I used jconsole to monitor my heap size change, found that the heap size is much less than 1G.

What I know: The size of heap will adjust after GC. And we are advised to set Xms the same as Xmx. (don't tell me these two things repeatedly)

My question: I just want to know, why after the first step, the error remains.

asked 1 min ago

rickyuu

1

JVM Xmx argument only works with Xms, maybe even not work properly