我需要将 Java 堆大小增加到 2GB RAM。为了做同样的事情,我以用户身份使用了命令(我没有以 root 用户身份执行此操作):
$ export JVM_ARGS="-Xmx2048m"
但是,java堆大小并没有增加。
$ 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)
有人可以建议我哪里出错了吗?
最佳答案
环境变量的名称是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)
关于java - 增加 Java 堆大小的速度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29577726/