[英]increasing java heap size pace
我需要将Java堆大小增加到2GB RAM。 为此,我以用户身份使用命令(我没有以root用户身份执行此操作):
$ export JVM_ARGS="-Xmx2048m"
但是,这样做后Java堆大小不会增加。
$ java -XX:+PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize'
uintx AdaptivePermSizeWeight = 20 {product}
intx CompilerThreadStackSize = 0 {pd product}
uintx ErgoHeapSizeLimit = 0 {product}
uintx HeapSizePerGCThread = 87241520 {product}
uintx InitialHeapSize := 1054841216 {product}
uintx LargePageHeapSizeThreshold = 134217728 {product}
uintx MaxHeapSize := 16877879296 {product}
uintx MaxPermSize = 174063616 {pd product}
uintx PermSize = 21757952 {pd product}
intx ThreadStackSize = 1024 {pd product}
intx VMThreadStackSize = 1024 {pd product}
java version "1.7.0_75"
OpenJDK Runtime Environment (rhel-2.5.4.0.el6_6-x86_64 u75-b13)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)
有人可以建议我要去哪里吗?
环境变量的名称为JAVA_TOOL_OPTIONS
:
$ export JAVA_TOOL_OPTIONS='-Xmx2G'
$ java -XX:+PrintFlagsFinal -version | grep -iE 'MaxHeapSize'
Picked up JAVA_TOOL_OPTIONS: -Xmx2G
uintx MaxHeapSize := 2147483648 {product}
openjdk version "1.8.0_40-internal"
OpenJDK Runtime Environment (build 1.8.0_40-internal-b27)
OpenJDK 64-Bit Server VM (build 25.40-b25, mixed mode)
java -Xmx4096m
例如:
java -Xmx4096m -XX:+PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize'
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