java - The system has enough memory but "Could not reserve enough space for object heap" -

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java - The system has enough memory but "Could not reserve enough space for object heap" -

i tryiung start java process requires lot of memory. reason, not work if specify more 19g of ram process. free , top show have 23g of free memory, wonder why error occurs.

total used free shared buffers cached mem: 24158 1047 23111 0 16 356 -/+ buffers/cache: 673 23485 swap: 2204 0 2204

starting process these jvm options:

-xx:+useconcmarksweepgc -server -d64 -xms4g -xmx22g

version:

java version "1.7.0_02" java(tm) se runtime environment (build 1.7.0_02-b13) java hotspot(tm) 64-bit server vm (build 22.0-b10, mixed mode)

however, if specify 19g xmx works.

the java vm allocates memory heap permgen space. can configuration heap space + permgen space exceeds free memory?

which value -xx:maxpermsize set to?

java memory ram

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