Hi gc exports, I have a Java application with following JVM options: "-Xms128m -Xmx256m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=256m"
When I use top to check memory usage, I got a very high virtual memory but a reasonable resident memory as below: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 93704 root 20 0 *11.4g* *477m* 19m S 0.0 0.1 26:53.65 java I understand the claimed virtual memory can be more than heapsize + metaspaceSize due to overheads in JVM implementation. I would expect this number to be a couple times of the size (heapsize + metaspaceSize) at most. But in this case it's >20 times. The claimed virtual memory usually is comprised of heap size, metaspace Size, and stack space. Could someone explain what else can contribute to this high markup? Thanks. # java -version java version "1.8.0_172" Java(TM) SE Runtime Environment (build 1.8.0_172-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode) Regards, Tao Mao
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