dawei
我有一个带4GB RAM的ubuntu 14.04系统,x86_64 3.13.0-48通用内核和openjdk-7.
我的记忆用法如下：
# free -h
total used free shared buffers cached
Mem: 3.7G 3.6G 127M 988M 44M 3.3G
-/+ buffers/cache: 232M 3.4G
Swap: 0B 0B 0B
因此,有足够的内存用作磁盘缓存,当任何应用程序需要时,应该刷新和释放(AFAIK).
所以,我尝试运行java：
# java -Xms32m -Xmx512m -version Error occurred during initialization of VM Could not reserve enough space for object heap Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.
只运行java -version会返回相同的结果.当有3GB的缓存内存时,为什么java不能运行？我在同一台机器上运行PostreSQL,但它的shared_buffers设置为940MB.
编辑：
我强制刷新磁盘缓存 – 仍然是相同的结果：
# free -h
total used free shared buffers cached
Mem: 3.7G 1.9G 1.8G 988M 35M 1.7G
-/+ buffers/cache: 196M 3.5G
Swap: 0B 0B 0B
# java -Xms32m -Xmx512m -version
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.
EDIT2：
这是ulimit -a：
# ulimit -a core file size (blocks,-c) 0 data seg size (kbytes,-d) unlimited scheduling priority (-e) 0 file size (blocks,-f) unlimited pending signals (-i) 30034 max locked memory (kbytes,-l) 64 max memory size (kbytes,-m) unlimited open files (-n) 1024 pipe size (512 bytes,-p) 8 POSIX message queues (bytes,-q) 819200 real-time priority (-r) 0 stack size (kbytes,-s) 32000 cpu time (seconds,-t) unlimited max user processes (-u) 30034 virtual memory (kbytes,-v) unlimited file locks (-x) unlimited
EDIT3：
我完全没有得到它：我试图添加4GB交换,结果是它工作,虽然没有使用交换：
# free -h
total used free shared buffers cached
Mem: 3.7G 3.5G 196M 988M 44M 3.2G
-/+ buffers/cache: 239M 3.4G
Swap: 4.0G 0B 4.0G
# java -version
java version "1.6.0_36"
OpenJDK Runtime Environment (IcedTea6 1.13.8) (6b36-1.13.8-0ubuntu1~14.04)
OpenJDK 64-Bit Server VM (build 23.25-b01,mixed mode)
你需要运行一些东西.
喜欢
java -Xmx1024m -cp /path/to/jar/ com.project.Start
