xmx
and xms
?xmx
and xms
are JVM, Java Virtual Machine, command-line options/flags that are used by programmers to manipulate the heap size used by JVM. This allows them to optimize the speed and memory of different java applications.
xms
xms
is used to specify the initial lower bound of java heap memory size.xms
size is 1/64th of the physical memory size.xms
:java -xms{Numerical Size}{Unit}
where Unit is for kilobytes, for megabytes, and g/G for gigabytets.
// FORMAT: java -xms{Numerical Size}{Unit}java -xms1Gjava -xms512m// Omitting Unit will result in the size being interpreted as bytejava -xms1024
xmx
xmx
is used to specify the upper bound of java heap memory size.xms
size is 1/4th of the physical memory size.xms
:java -xms{Numerical Size}{Unit}
where Unit is k/K for kilobytes, m/M for megabytes, and g/G for gigabytes.
// FORMAT: java -xms{Numerical Size}{Unit}java -xmx1Gjava -xmx256k// Omitting Unit will result in the size being interpreted as bytejava -xmx512
java.lang.OutOfMemoryError: Java heap space
.What will be the lower and upper bound of java heap memory size for this:
java -xms1024
java -xmx256G
upper bound:1024 bits
lower bound:256 gigabytes
upper bound:256 gigabytes
lower bound:1024 bits
upper bound: 0.25 terabytes
lower bound:1024 bytes
upper bound:1024 bytes
lower bound: 256 gigabytes
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